There is an ACM update that helps reduce that fault. It’s software level 7.61.1.0. All other power train modules will have to be updated as well to avoid configuration errors. With the after-treatment cold, check Nox sensor dew point hours under Actions->Aftertreatment->Nox sensor verification tab. Wait for dew point hours to populate (takes a couple seconds) if either sensor is over 8,000 hours, it’s a good idea to replace both of them. Great explanation. I hope my add on will help others
I’ve performed that update on several trucks and unfortunately I do not think it corrects the issue. The problem is not only with the heavy duty engines, but the medium duty engines as well. I’ve replaced basically every component in the after treatment system to no avail. The only thing that may have been successful was replacing the one box on a medium duty dd5. I did that recently but haven’t had the truck run enough to know if that corrected the problem. Maybe that will work on certain trucks, certainly worth a try, but in my experience it hasn’t corrected the issue.
@@alreyindustries I've had similar experiences. Had three trucks with multiple occurrences of this fault. Found cracked dpfs on two of them and ended up finding bad jake brake solenoids. The third I found the unit had over 500k miles with a 50% idle time. We replaced the one box and have not seen it back after two months.
Thank you for uploading this video. I got the same issue, Both fault codes (520372-16 and 520371-16) popped up about 4600 miles after the DEP cleaning job (baked). I was going to take it back to the shop buy find your video and read all the comments. The following is what i did: 1, Run Nox sensor verification first. the result: pass. 2, Perform Parked SCR Efficiency Test, This test took about 2 hrs. I didn't finish this test, because the software was not responding at some point. I restart the program and ran it again (but I didn't finish the test, don't know what the end result looks like). The ASl: NH3 LARMF compensation factor value went from 0.74475 to 0.92993. Both fault codes went away when the value got to 0.92993. While it was running the Parked SCR Efficiency Test, both SCR Inlet Nox sensor and Outlet Nox sensor readings are around 380ppm and 0ppm ( I did see some -1,-2-3). the Nox conversion efficiency value is almost always at 1.0000. These are really weird fault codes. I just want to share my experience with others, I hope it will help others. As you said in the video, they will come back, Let's wait and see how soon it will come back, I will report back. Thanks! Be safe everyone.
Just came back to have some update about this issue. These codes are keep coming back. Yes, the SCR Efficiency Test works, but only for the a short while. These are really annoying codes. When these codes came back, I didn't not experience any power lose or anything. It just worries me that these codes will eventually cause other problems or derate when driving.
I have the same issue and I have another code :4364/17, I tried to do a SCR efficiency test, but the test was aborted automatically. System reminds me to check for components failure in the SCR system. Don’t know what to do with it.
@@joefeng23 For this code, I think you have problem with your Nox sensors. Try to run Nox sensor verification test first. I think the code 4364/17 will derate you if you don't take care of it. I took care both fault codes 520372-16 and 520371-16 by changing the DEF dosing unit and outlet Nox sensor. Also got the SPN-3216/20 code 3 weeks ago and replaced Inlet Nox sensor. I hope these will help you, be safe!
I really have trust issues, but you seem like someone I would trust with my big baby. Giving out great info just to help us out. You are a blessing. Next time I'm in Florida, I'll reach out to you about possibly doing my valve lash adjustment. Coming up on 500k miles on my DD13. And if I haven't bought the datalink yet, you can do the scr tests also.
LARMF stands for lumped average of magnitude frequency, it’s an algorithm the acm uses by sampling frequencies to adjust def quantity dozed into scr to prevent ammonia slip. I have found several times that if you perform a def quantity test 3 times on the second or third time it will fail. Majority of the common failures happened on units with a poor duty cycle who travel through local city traffic with light loads, I always tell repeat failures to adjust routes to allow for longer drives and dog the truck when you can to help burn off soot loads
Why would the quantity test fail after several tests? I thought it was a stationary test to check the condition of your DEF pump and DEF doser. If if fails then wouldn't that tell us in your specific case it's an issue with your DEF dosing system e.g. bad pump or harness?
2 trucks came in today with the same issue. Your video helped alot. You should only need to do the scr once though. Did you check to see if the doser or the hole the doser goes into is plugged? Thats what happened to both trucks which messes with how the scr efficiency is calculated. I cleaned out both, ran a Def quantity test to make sure the doser was spraying afterwards. Then I did the scr test once on both trucks. The code went from active to permanent. At that point you wanna reprogram the ACM and the code will be completely gone.
I’ve dealt with this code on numerous trucks and numerous platforms. Both heavy and medium duty Detroit engines. In the process I have replaced basically everything in the after treatment system and we have sent trucks to the dealership for them to diagnose. The trucks are converting NOX appropriately, that’s not the problem. The problem is with the amount of def being used to maintain conversion efficiency. It is outside the set parameters in the “closed loop system” which I think is what the NH3 levels are tracking and why the code is being thrown. My assumption is bad scr (one box) or detroit needs to come out with updated parameters, but I don’t know. This is the only thing that works, and the codes will keep coming back.
I have this same issue I have replaced sensors filters and it's driving me insane looking at those lights. So far I've logged 2 thousand miles and no derate I clear code it comes back 40 or so miles down road, some say pull outlet nox sensor and let it breath fresh air and secure it somewhere has anyone had luck with this, also repeatedly paying shop to clear via scr test and down time killing bottom line. Any hacks out there work for anyone. Other then delete don't wanna go that route but man they're forcing it with this b.s.
One time I had to cut the scr test short at about .93...the service light went off. I Said I would come back later to get the nh3# to 1.0.. about 300 miles later, i hooked it up to the computer to get the nh3 to 1 and it had gone up to 1 on its own
I work for a school district and do this every two to three weeks on two detroits we have . Has anyone been updated on a fix ? Im sure the constant idling waiting at the schools don't help either . Any one know any tricks ?
How about an F-ing Class action lawsuit !!! Any attorneys out there?? I’m so sick of this emissions crap with Daimler Detroit Freightliner Inc. I don’t have the money to buy a new or even another truck or another One Box. How about some help for the workin slob for once?!?! ✌️ y’all.
Good thing I bought the software. About to perform the 3rd round of scr efficiency tests in less than 5000 miles... why is the nh3 number dropping so fast.?
My SCR passed but when I did the Nox verification my Nox levels were not reading correctly. My inlet Nox was bad. All my softwares were up to date. Changed the inlet Nox and ran another Nox verification and the code went away and Nox levels passed.
Thank you for the video. I have this code on a 2017 Cascadia. Would there be any benefit taking it into a shop, or should I keep clearing code with my diagnostic tool? Will excessive def use shorten the lifespan of one box? Should I load up my parts cannon and fire off at the aftertrement system? Thank you again
Don’t waste your time or money replacing anything. It will not help. Unless there are other codes that are active. Simply clearing the codes will not continue to work either. You have to run the SCR test to raise the nh3 level. As long as you do that you should be good. I have not seen any shortened life spans to the one box or anything like that. Just a nuisance code.
Many other good explanations on this thread. But it's going to need a one box. Not a waste of money. Keep the fleet going and yourself yes. A new one box pays for itself.
@@stevenliberadzki9160 can you explain how you came to this conclusion? Because I have replaced one boxes and it has not corrected the issue, nor have I seen that as being the recommended solution in any Detroit Diesel literature. But if have solid information showing that the one box is the issue, please share.
@@alreyindustries I'm actually in the middle of competing this exact issue as we speak. Not this particular unit because I am in an m2 dd15 but in Cascadia p3 we had campaigns for that exact fault and the resolution was a one box replacement. I'm not inside atm or I could gather the campaign number for you. It's been a couple years since. But we had so many we had to store them at one of our less busy ships. Here we maintain 900 units. Currently running a regen before I can run my scr tests to finally allow the system to reset the faults. My current scr closed loop, def quality low, and 3 others caused from the scr for lamps. This units history inevitably led to the one box. Can only throw so many parts at it for a good for now. Even new dpfs.
I am new to trucking and I would like to star diagnostic my own truck, right now my 2018 New style Cascadia has both 520372 16 and 520371 16 I had been lately idling my truck almost non stop, until today now that I got an APU, codes recently appeared in my dash, will this video help solve those 2 codes, also how do I get the Detroid Diagnostic Link ? And what type of cable do I connect to laptop to OBD port on truck? Thanks a lot in advance
I feel your pain man. I wish I had a better fix. We just replaced a one box on another one to see if it will help, but it is still in the shop. No good updates as of now from me😒
I just bought the standard Version of diagnostic link 8. It made me run a dpf regen before running the scr test. The nh3 number comes up a lil but after 5 minutes the scr test stops. Am I doing this right? Just keep running scr tests? Correction. It was waiting for me to press the manual regen button. Scr system is stabilizing now. Wish me luck 🙏🏾
Yes it can be a real pain and sometimes takes hours. If the nh3 level does not come up enough during the first scr test, or it fails, you will have to run a regen and sometimes cycle the key before it will let you do another scr test. It’s crazy that there is no better fix yet, but that is how you do it.
@@thadiesel7655 just shut the key off until diagnostic link loses connection with the main modules, mcm, cpc, acm. Or if that didn’t happen automatically just wait like 30 - a minute, then key back on and let everything reconnect
Once the light comes on and the code comes back how long can you drive on it before it becomes a problem? When the truck does the auto regen while you're parked say on your 10-hour break does that bring the LARMF number up? I only ask because ever since winter time has come and I stop idling at night is when this problem started.. once the code is cleared it last anywhere from four days to a month before it will come back on
I’m not 100% on this, but from my experience, no. A regen normally does not bring the nh3 level up. On some applications the closed loop code will not derate. Meaning you could drive with the code active indefinitely, but you would have to call a service department with your vin and fault code number and ask them if the code you have will derate you or not.
Will it come back again. My 2018 Cascadia has the same issue. Mechanic advised that the onebox needs to be replaced as the SCR efficiency is low. The other option he suggested is to keep the NoX outlet hanging outside. What's your take on this. Given the market scenario I am less inclined to replace the Onebox.
The one box most likely does not need to be replaced. Leaving the nox sensor hanging out will not work. The nox sensor must reach a certain temperature in order to for it to start reading. If it does not reach that temperature it will not start reading and you will be shut down for a nox sensor code. If the two fault codes you are experiencing are scr closed loop and nox efficiency low moving average (something along those lines), the only advice I can give is do the procedure in this video. Make sure your computer software is up to date. I want to say that these codes should not derate, but I’m not sure if that is always the case.
@@alreyindustries At first I got this code along with poor def quality code. Cleared the doser and ran a regen the def quality went away. But the closed loop and low moving average stayed active. These codes do derate. It’s the only code I had left and the def inducement lamps, including the red SEL were active. 5mph. I was able to clear them with the scr test like the video. Now I’m worried it will randomly come back, but I have Detroit link now. What can be done to permanently get rid of this problem? Change one box and all the sensors?
@@serggla924 I worked at a large trucking company for 8 years as a lead technician. I had this issue on several different trucks, different engine models, and different situations. We tried everything we could to find a permanent fix for this issue. I replaced all sensors, one boxes, def dosers, pumps, etc. Nothing solved the problem permanently. As you can see if you read through the comments on this video, some people claim they have had success after doing x, y, or z. I would not personally recommend replacing parts. I think it’s a waste of money, but if you want to try it, that’s up to you. Best thing to do is make sure you MCM, CPC, and ACM software are up to date, inspect the entire exhaust system for any leaks, and then run the SCR test when necessary. Sorry for the bad news but I still have not heard of any permanent fix for this issue.
Question : I have OTR Performance device with app on the phone and I got and option for “Forced SCR efficiency regen” Is this gonna bring the nh3 value up ? Is it the same as SCR efficiency test you’re doing on the laptop ? Thank you
I’m not familiar with the OTR devices. Is there an option for a forced regen in distinction to the “forced scr efficiency regen” option? If so, I would imagine this is the equivalent to scr efficiency test. If I were in your situation and I had some time to run the “forced SCR efficiency regens” I would go ahead and do it. If the code does not clear after the first one I would try to run it up to three times. If it doesn’t allow you to or it doesn’t clear the code, you may need to hook up with some software that can read the nh3 and perform the proper test.
So should I send this driver to the dealer since you guys are saying this is just a system update ? Or is there anything else I can do to get this driver back home? Anything specifically I should be lasering in on .
You can run the scr test until the code clears. That will buy you time and will probably get you where you need to go. But to get it fixed… some people say software updates, some people say they have found other fixes, I do not know of any permanent fixes.
Anyone got a new update from freightliner or a permanent fix? Same codes took to dealer charged $300.00 to tell me the same code i told them that displayed on dash. How many trucks with the same issue? There should be a campaign or recall for this issue. Going to let the Outlet Nox sensor breath fresh air like someone stated. I hope it works.
Hi I am having Same issue..its 2019 cascadia dd15. Both new nox sensors. Dpf clean.. def doser new..software updated.efficency stayed at .95 during tests..but after 4-5 hours driving code comes back again.spn 4364 fmi17,spn 520372 and 520371..plz shed some light
I’m pretty sure those are the scr closed loop faults which this video talks about. To my knowledge there is no permanent fix to this issue. The only thing you can do is run the scr test whenever these codes come in order to get the NH3 level back up to near 1.0 %. The only other fix I could imagine there being is programming, but if the dealer or your repair place has already programmed all the modules, then I don’t think they have come out with a real programming fix yet.
@@AmanAndHisTruck123 these faults will not cause any significant damage to other parts of the truck. The truck is safe to continue driving. However, if these fault codes are not corrected, the truck will go into “derate”. Then you will have to have the truck towed or whatever else until the problem is resolved. The best thing to do is run however many scr tests it takes to get the nh3 level up to at least .99-1.0. If you only get the level up to around .91, enough to clear the codes, they will usually come back much sooner than if you were to get the level up to .99-1.0. Hope that helps.
Any updates ? My company has 54 2017 dd13 and closed loops everyday, we were told by dealer to chart all the nh3 bins and run repeated parked scr efficiency tests until all bins are @ 1.0 it's still only a temporary fix some trucks last 3 days some 3 weeks. I replaced the acm with one from a low milage roll over truck we had as a test still waiting for results
@@alreyindustries we where thinking of trying to weld some bungs further down steam and mounting the outlet nox sensors there . New one boxes have not cured the problem
@@jesselegz4312 why do you think that would help? Just curious. The reading that I’ve done on it, if I’m understanding correctly, states that the dosing is controlled by a closed loop system - meaning the feedback the ecm gets from the nox sensors determines how much def is dosed to control conversion efficiency. Conversion efficiency is never the problem. They are almost always converting appropriately. The problem is that too much def is being required according to the closed loop parameters in order to keep conversion where it should be. The nh3 levels are detecting the amount of ammonia or unused def that is coming out of the scr. Because excessive def is being required to control the system, the code for closed loop is thrown. The problem is, nothing seems to correct the problem. I’ve replaced basically everything in the after treatment system and nothing changes. I’m stumped. I think it is a programming issue or something but I am totally baffled as to why Detroit would not correct the programming issue if that’s all it was. 🤷🏻♂️ let me know if you figure anything out.
I really wish that Detroit had implemented a function similar to Cummins' "Aftertreatment Maintenance - Reset All" feature. You still have to run the equivalent of the same tests with Cummins, but you wipe out the learned averages so you start with a clean slate and don't end up beating your head against the bricks repeatedly re-running the same test just to get a learned average above the minimum. So stupid.
I have a 2021 truck with same issue dealer will only do an efficiency test until MIL goes off and release the truck a week later lights come on..and so we go back and forth..is there a real fix for this issue?
No. This is all Detroit has released on this fault to my knowledge. I wrote in some other comments, I’ve replaced every component in the after treatment system and the code still comes back. Has to be something in the programming or something but I don’t know. Definitely a nuisance code and unfortunately this band aid fix is the only one I know of.
THANKYOU SIR it worked for me had the same code and the nox code.. Did the regen and scr efficiency test.. was arpund.71.. after 1 hour of scr testing went up to .93 and codes went away... Would the codes come back after how long ??? did a nox efficiency test eas at 98 percent.. I don't idle my truck at all have 400k only 2018 cascadia
Glad it worked for you. Every truck is a bit different. I’m working on a truck now that is back about once a week with this code while other trucks will come back maybe once a month or so. I really do not know why. The best thing you can do is get that NH3 level as close to 1.0 as possible. That will usually get you the most time between faults.
Well, that code is a bit different than this “closed loop” code. If these “closed loop” codes are active along with 4364, then I would follow this video. If you are just having the 4364 efficiency code, then yes, there are fixes for that code but it could be a few different things.
@@alreyindustries we have done all the trouble shooting. Passes scr efficiency test with no problems. I personally believe this is a design flaw in the one box or a programming issue. I had scr efficiency issues with Volvos. They updated the software, and efficiency issues went away.
@@monicaallen5266 is 4364 the only code? What kind of engine? When you say it passes the efficiency test, do you mean you see that it is converting NOX at above .90% and the codes clear? Then it comes back?
@@alreyindustries we will run it through a parked regen, then run it through an scr efficiency test. Passes scr efficiency test. It throws the low nox efficiency while under a load. Sometimes it will give a bad def quality code.
Def injector (doser valve) is faulty your g/h of def should be between 500 and 800. Your DEF pump speed is too high shouldn't exceed 1200. Normal is 1100 - 1150 rpms. Your pump is working too hard because the Injector is stuck open. Need to look at ash percentage in the mcm and acm and also need to monitor the doc pressure. If it's getting up close to 1 or higher the dpfs need replaced.
@@alreyindustries so the only benefit to the pro version when it comes to newer trucks Is that the pro will update ecm and change parameters,.. is that accurate?
@@briansingleton9752 actually I think the regular version will allow you to change parameters as well. So really it’s just programming that is the difference. I think.
@@alreyindustries wow. That would be Amazing if it does. According to the website, the regular doesn't change parameters on 2017 and newer. Mine Is a 2019.. either way I'll be good with scr tests and clearing codes. Thanks. You're the man..
From what I read about the fault, yes. It is basically saying that the truck is requiring the maximum amount of def to maintain scr efficiency. Like too much DEF is being used based on the programmed parameters. So, I’m assuming that if the problem was corrected, DEF consumption would go down. I could be wrong but that is my hypothesis.
@@alreyindustries makes sense to me.. thank you. Where can I buy the datalink software? And next time I'm In Tampa, I'm coming to show my appreciation.. its actually time to a valve lash adjustment. Hopefully you can take care of it for me.
100%? maybe crystals of def in the decomp being dissolved by the heat and fresh spray of hot def causing over efficiency, there is no way the scr can be 1005 efficient
Wondering if you might know why. But when I got the truck, I drove 7 months, almost 80k miles without this issue. Now that I'm running the scr efficiency tests, I have to run the test like every other week. Is there another test or regen I can do to prolong the time between?
Scr getting old. When you do test . The one box can reach 780f. But you run on the road . The one box only can go around 400. This is problem . The def can’t get gasify
A regular SCR test can take as little as 10-20 minutes. However, if this code is active, the scr test could take a lot longer. Depends on where your nh3 level is. It can take up to 6 hours sometimes to get the nh3 level up to where it needs to be because you may have to run multiple scr tests and a regen.
Hello my truck has been in shop 3 times in 10 days with this code. Everytime they run scr efficiency tests and code goes away and they release unit. But it comes back again. They have changed nox censors. What else could be the problem.
I have fought and fought and fought with this code. Replaced everything in the after treatment system, sent it to the dealer, and nothing. There is no “permanent fix”. I think it’s a Detroit problem and should be addressed with them.
@@alreyindustriesMy truck doesn't derate or loose power when the mil light comes on with this faut code. Once i drove for 1400 kms, once 750kms and once 500kms when light pops up. How long does it usually take for truck to start derating, any idea??
@@MANINDER0242 it varies I think. I’m not sure off the top of my head. Usually, the MIL will come on, the engine light that is just solid amber. After that is on for a certain amount of time, or another code is set, the CEL comes on. That is the engine light that has the word “check” in the middle of it. That usually indicates a more severe issue or an “ignored” issue and once a certain amount of time passes or key cycles occur, the truck will go into derate. So if you only have the amber MIL light on you should be ok for a while, when the CEL light comes on then you have less time. That’s usually how it works at least I think.
yep my truck is on its way back to shop for same reason. The shop tech told me that they replaced Nox sensor but after i read the invoice no nox sensor replaced. just the dose filter and nox sensor test which one has failed.
There are two yearly subscription options from Detroit. 1. Is around $600 and gives you access to everything basically except programming computer modules. 2. Is around $2,000 and allows you to do everything including program modules. The second is what I was using in this video. There are other “non-dealer” options. I also use the Diesel Laptops tablet. It cost around $3500, but it is not a yearly subscription. It allows you to connect and run tests indefinitely. However, it is not as nice and user friendly as the Detroit program.
@@thadiesel7655 it’s kind of a hassle. I actually have not bought the Detroit software for myself, just used it. You have to create an account and stuff just to try to purchase it. You can go to diagnosticlink.nexiq.com and try to figure it out yourself or try calling an authorized dealer and maybe they can help you with it.
So the $500 a year subscription will run scr efficiency test? And then you just need any laptop? Do you need internet while doing the test? Because it seems to me if I had the software to look at the code I would save money even with buying a laptop and paying $500 a month subscription... seeing how I've had the same problem as everybody else and I've replaced filters and the pump has been replaced and the nox sensors have been replaced.. where the light comes on as of now I'm pretty sure I know what it is but I'm not positive it could be something else so of course I have to bring it to the shop to get it looked at and then of course they want to run the tests again and they want to charge me at least this way I would know what it is and I can run the tests at my leisure.. they charged me $200 a pop so I figure after the 4th or 5th time will be clearing the code myself everything's already paid for itself and just like everybody else I get four days to about two and a half weeks before the code will come back on there's no telling
The basic subscription is like $600 a year. It will run the scr test and it does not require internet. The subscription payment is annual so you won’t have to pay that fee every month. On the website they have the software requirements you need for your laptop in order to run the program.
@@richardgolubiak2929 it might be a little more expensive but it would probably be best to get everything through nexiq. You need the Nexiq USB link 2, the 9 pin connector that goes from that to the truck, and then you need the USB cord that connects your computer to the USB link 2.
Only solution I know of is this video brother. There may be an ecm update that might help, but it’s a common problem. If you’re in the Tampa Bay Area, give me a call: Toptechdieselrepair.com
@@alreyindustries bro I did the scr efficiency test and level went to 1.00000 and after driving 4 hours 270 miles and same problem again I’m trying to reach to Bakersfield ca still stuck in El Paso TX.
No. Doing a regular regen will not help. You must do an actual SCR test through the Detroit or other software. The test allows the truck to get the NH3 level back up to where it wants to see it and often takes at least one test if not more and a few hours for each test. The SCR test does put the truck into a type of regen but they are not the same thing. Unfortunately.
@@MM-rl7co yes. I dealt with 520372 twice today. It is SCR closed loop. Running the test to get the nh3 level up will take care of the problem for some time. But it will come back. Make sure whoever you take it to gets the nh3 level up 1.0 or else it will come back quicker. Might think about contacting Detroit if the problem persists. The other code is related and should be taken care of by the test as well.
@@alreyindustries sorry im bothering you I have one last question, can scr problem and this codes cause de rates I mean can truck loose power and stop?
@@kamalpatwar4800 Yes, it take me day after replacement of my Nox Outlet sensor. That's code stay on until I drive and drive def light came on . I did force Regen 2 time to get SCR quality to 1.00. I learn and follow this great technician. I watch all his videos. After force Regen 2 consecutively. I did check the nh3 and my scr is at 1.0. Than after that I did SCR quality test than the code go away after drive
I can’t say that I know it will not help in every situation, but I have replaced the one box on at least one truck with this issue and the code still came back. This code effects both heavy and medium duty engines dd5, dd8, dd13, dd15 etc. I have been searching for a fix and replaced basically everything and updated all software. And yet still, the code comes back eventually. To my knowledge- there is no permanent fix. Only this temporary repair.
yikes I just had these 2 codes come up... 520372 16 520371 16.. so no real fix. I'd don't idle at all.. so the real fix is not the dozer pump or the def filter.. so I need to get the data link software 🤔
You could also try calling Detroit or freightliner and talk to them about help with these codes. They know it is a common problem and I hope they are offering some kind of help, but I don’t know.
@@alreyindustries Yeah I don't want to park my truck with them for a week and they r gona throw parts at it.. So do you think it would go into derare mode soon or can I keep driving like that or paysome to reset it.
@@dell7054 I just looked those codes up in the ghg 17 troubleshooting manual and it says that neither one of them will derate you. If those are the only two active codes, according to the manual, you should be ok to continue to drive the truck.
@@alreyindustries So what would be a good way to get rid of the check engine lite..would the detroit link software get rid of the code.. I may get the software??
@@dell7054 yes, if you get the software that enables you to run the SCR test, that will cause these fault codes to go inactive. However, the software is pretty expensive. I don’t know if it would be worth it, but you would have to figure that out I guess.
There is an ACM update that helps reduce that fault. It’s software level 7.61.1.0. All other power train modules will have to be updated as well to avoid configuration errors. With the after-treatment cold, check Nox sensor dew point hours under Actions->Aftertreatment->Nox sensor verification tab. Wait for dew point hours to populate (takes a couple seconds) if either sensor is over 8,000 hours, it’s a good idea to replace both of them.
Great explanation. I hope my add on will help others
I’ve performed that update on several trucks and unfortunately I do not think it corrects the issue. The problem is not only with the heavy duty engines, but the medium duty engines as well.
I’ve replaced basically every component in the after treatment system to no avail. The only thing that may have been successful was replacing the one box on a medium duty dd5. I did that recently but haven’t had the truck run enough to know if that corrected the problem.
Maybe that will work on certain trucks, certainly worth a try, but in my experience it hasn’t corrected the issue.
@@alreyindustries have you come across any Gen5 DD15 engines yet?
yeah I cannot update I do have ddl but not the server access. the scr test fixed my issue
ue.
Ya that software does nothing
@@alreyindustries I've had similar experiences. Had three trucks with multiple occurrences of this fault. Found cracked dpfs on two of them and ended up finding bad jake brake solenoids. The third I found the unit had over 500k miles with a 50% idle time. We replaced the one box and have not seen it back after two months.
This is the real world fix and is 100 percent correct. Keep them trucks running brother.
Thank you for uploading this video. I got the same issue, Both fault codes (520372-16 and 520371-16) popped up about 4600 miles after the DEP cleaning job (baked). I was going to take it back to the shop buy find your video and read all the comments. The following is what i did: 1, Run Nox sensor verification first. the result: pass. 2, Perform Parked SCR Efficiency Test, This test took about 2 hrs. I didn't finish this test, because the software was not responding at some point. I restart the program and ran it again (but I didn't finish the test, don't know what the end result looks like). The ASl: NH3 LARMF compensation factor value went from 0.74475 to 0.92993. Both fault codes went away when the value got to 0.92993. While it was running the Parked SCR Efficiency Test, both SCR Inlet Nox sensor and Outlet Nox sensor readings are around 380ppm and 0ppm ( I did see some -1,-2-3). the Nox conversion efficiency value is almost always at 1.0000. These are really weird fault codes. I just want to share my experience with others, I hope it will help others. As you said in the video, they will come back, Let's wait and see how soon it will come back, I will report back. Thanks! Be safe everyone.
Just came back to have some update about this issue. These codes are keep coming back. Yes, the SCR Efficiency Test works, but only for the a short while. These are really annoying codes. When these codes came back, I didn't not experience any power lose or anything. It just worries me that these codes will eventually cause other problems or derate when driving.
I have the same issue and I have another code :4364/17, I tried to do a SCR efficiency test, but the test was aborted automatically. System reminds me to check for components failure in the SCR system. Don’t know what to do with it.
@@joefeng23 For this code, I think you have problem with your Nox sensors. Try to run Nox sensor verification test first. I think the code 4364/17 will derate you if you don't take care of it. I took care both fault codes 520372-16 and 520371-16 by changing the DEF dosing unit and outlet Nox sensor. Also got the SPN-3216/20 code 3 weeks ago and replaced Inlet Nox sensor. I hope these will help you, be safe!
@@TJWU2010 hi yesterday i goted that issue after change the def pump
@@MRTWU hi i have same issue can you please help me i have 53037 2 code after drive one hour . Please help me thanks
So, ture maintaining a fleet of 20 M2, I have done a lot of roadside called just cause of the code. 😮💨 great job explaining it.
I really have trust issues, but you seem like someone I would trust with my big baby. Giving out great info just to help us out. You are a blessing. Next time I'm in Florida, I'll reach out to you about possibly doing my valve lash adjustment. Coming up on 500k miles on my DD13. And if I haven't bought the datalink yet, you can do the scr tests also.
Thanks buddy. That’s why I started making videos, to help people out. Toptechdieselrepair.com
What a great help brother!! If you were here I would give you a hug!! Keep up the good work !! Thank you!! 🦾
Thank you for the great explanation This has helped a lot they need to come up with an update fix with a lower parameter.
Thanks, dude. I'm new to disel and I work by myself in a new shop. This video helps out a lot.
Fantastic video very well explained. Easy to understand if you have worked on dd engines after treatment 👌
LARMF stands for lumped average of magnitude frequency, it’s an algorithm the acm uses by sampling frequencies to adjust def quantity dozed into scr to prevent ammonia slip. I have found several times that if you perform a def quantity test 3 times on the second or third time it will fail. Majority of the common failures happened on units with a poor duty cycle who travel through local city traffic with light loads, I always tell repeat failures to adjust routes to allow for longer drives and dog the truck when you can to help burn off soot loads
Why would the quantity test fail after several tests? I thought it was a stationary test to check the condition of your DEF pump and DEF doser. If if fails then wouldn't that tell us in your specific case it's an issue with your DEF dosing system e.g. bad pump or harness?
Dozer failed? Can’t stop or can’t open?
Thanks for the info you save me
2 trucks came in today with the same issue. Your video helped alot. You should only need to do the scr once though. Did you check to see if the doser or the hole the doser goes into is plugged? Thats what happened to both trucks which messes with how the scr efficiency is calculated. I cleaned out both, ran a Def quantity test to make sure the doser was spraying afterwards. Then I did the scr test once on both trucks. The code went from active to permanent. At that point you wanna reprogram the ACM and the code will be completely gone.
I’ve dealt with this code on numerous trucks and numerous platforms. Both heavy and medium duty Detroit engines. In the process I have replaced basically everything in the after treatment system and we have sent trucks to the dealership for them to diagnose.
The trucks are converting NOX appropriately, that’s not the problem. The problem is with the amount of def being used to maintain conversion efficiency. It is outside the set parameters in the “closed loop system” which I think is what the NH3 levels are tracking and why the code is being thrown.
My assumption is bad scr (one box) or detroit needs to come out with updated parameters, but I don’t know. This is the only thing that works, and the codes will keep coming back.
I have this same issue I have replaced sensors filters and it's driving me insane looking at those lights. So far I've logged 2 thousand miles and no derate I clear code it comes back 40 or so miles down road, some say pull outlet nox sensor and let it breath fresh air and secure it somewhere has anyone had luck with this, also repeatedly paying shop to clear via scr test and down time killing bottom line. Any hacks out there work for anyone. Other then delete don't wanna go that route but man they're forcing it with this b.s.
Thank you for sharing this very helpful content
Software updates for the ACM allegedly are supposed to be tweaked to make this issue less of a problem.
Thanks, I’ve been going crazy on this code!!
Very helpful video, Thanks
Thank you ,the truck shut off red warning light at 0.925.
One time I had to cut the scr test short at about .93...the service light went off. I Said I would come back later to get the nh3# to 1.0.. about 300 miles later, i hooked it up to the computer to get the nh3 to 1 and it had gone up to 1 on its own
I work for a school district and do this every two to three weeks on two detroits we have . Has anyone been updated on a fix ? Im sure the constant idling waiting at the schools don't help either . Any one know any tricks ?
How about an F-ing Class action lawsuit !!! Any attorneys out there?? I’m so sick of this emissions crap with Daimler Detroit Freightliner Inc. I don’t have the money to buy a new or even another truck or another One Box. How about some help for the workin slob for once?!?! ✌️ y’all.
Good thing I bought the software. About to perform the 3rd round of scr efficiency tests in less than 5000 miles... why is the nh3 number dropping so fast.?
My SCR passed but when I did the Nox verification my Nox levels were not reading correctly. My inlet Nox was bad. All my softwares were up to date. Changed the inlet Nox and ran another Nox verification and the code went away and Nox levels passed.
do you know what we're the ready of the nox efficiency test?
I'm Rachel Chavez sorry my daughter was logged in
Thank you for the video. I have this code on a 2017 Cascadia. Would there be any benefit taking it into a shop, or should I keep clearing code with my diagnostic tool? Will excessive def use shorten the lifespan of one box? Should I load up my parts cannon and fire off at the aftertrement system? Thank you again
Don’t waste your time or money replacing anything. It will not help. Unless there are other codes that are active.
Simply clearing the codes will not continue to work either. You have to run the SCR test to raise the nh3 level. As long as you do that you should be good. I have not seen any shortened life spans to the one box or anything like that.
Just a nuisance code.
Many other good explanations on this thread. But it's going to need a one box. Not a waste of money. Keep the fleet going and yourself yes. A new one box pays for itself.
@@stevenliberadzki9160 can you explain how you came to this conclusion? Because I have replaced one boxes and it has not corrected the issue, nor have I seen that as being the recommended solution in any Detroit Diesel literature.
But if have solid information showing that the one box is the issue, please share.
@@alreyindustries I'm actually in the middle of competing this exact issue as we speak. Not this particular unit because I am in an m2 dd15 but in Cascadia p3 we had campaigns for that exact fault and the resolution was a one box replacement. I'm not inside atm or I could gather the campaign number for you. It's been a couple years since. But we had so many we had to store them at one of our less busy ships. Here we maintain 900 units. Currently running a regen before I can run my scr tests to finally allow the system to reset the faults. My current scr closed loop, def quality low, and 3 others caused from the scr for lamps. This units history inevitably led to the one box. Can only throw so many parts at it for a good for now. Even new dpfs.
@@stevenliberadzki9160 ya post that campaign number if you can. I’d like to look at it. Thanks.
I have this code your explaining plus inlet nox high drift and erratic voltage for inlet nox
I am new to trucking and I would like to star diagnostic my own truck, right now my 2018 New style Cascadia has both 520372 16 and 520371 16
I had been lately idling my truck almost non stop, until today now that I got an APU, codes recently appeared in my dash, will this video help solve those 2 codes, also how do I get the Detroid Diagnostic Link ? And what type of cable do I connect to laptop to OBD port on truck? Thanks a lot in advance
Any updates on a real fix? I hate to do scr efficiency test la they take for ever sometimes 6hrs + to get it to 1. And only lasts a month
I feel your pain man. I wish I had a better fix. We just replaced a one box on another one to see if it will help, but it is still in the shop. No good updates as of now from me😒
I just bought the standard Version of diagnostic link 8. It made me run a dpf regen before running the scr test. The nh3 number comes up a lil but after 5 minutes the scr test stops. Am I doing this right? Just keep running scr tests?
Correction. It was waiting for me to press the manual regen button. Scr system is stabilizing now. Wish me luck 🙏🏾
Yes it can be a real pain and sometimes takes hours. If the nh3 level does not come up enough during the first scr test, or it fails, you will have to run a regen and sometimes cycle the key before it will let you do another scr test.
It’s crazy that there is no better fix yet, but that is how you do it.
@@alreyindustries so how exactly do I correctly do an ignition cycle. I actually had to run the regen first to get this far.
@@thadiesel7655 just shut the key off until diagnostic link loses connection with the main modules, mcm, cpc, acm. Or if that didn’t happen automatically just wait like 30 - a minute, then key back on and let everything reconnect
@@alreyindustries got it. Thank you so much for being available to us regular folks.. you are truly a gift to us.
@@alreyindustries nh3 up to .964 and still climbing. Only code still there is the 520349 fmi 14. Should I do a regen afterwards?
Once the light comes on and the code comes back how long can you drive on it before it becomes a problem? When the truck does the auto regen while you're parked say on your 10-hour break does that bring the LARMF number up? I only ask because ever since winter time has come and I stop idling at night is when this problem started.. once the code is cleared it last anywhere from four days to a month before it will come back on
I’m not 100% on this, but from my experience, no. A regen normally does not bring the nh3 level up.
On some applications the closed loop code will not derate. Meaning you could drive with the code active indefinitely, but you would have to call a service department with your vin and fault code number and ask them if the code you have will derate you or not.
Will it come back again. My 2018 Cascadia has the same issue. Mechanic advised that the onebox needs to be replaced as the SCR efficiency is low. The other option he suggested is to keep the NoX outlet hanging outside. What's your take on this. Given the market scenario I am less inclined to replace the Onebox.
The one box most likely does not need to be replaced. Leaving the nox sensor hanging out will not work. The nox sensor must reach a certain temperature in order to for it to start reading. If it does not reach that temperature it will not start reading and you will be shut down for a nox sensor code.
If the two fault codes you are experiencing are scr closed loop and nox efficiency low moving average (something along those lines), the only advice I can give is do the procedure in this video. Make sure your computer software is up to date. I want to say that these codes should not derate, but I’m not sure if that is always the case.
@@alreyindustries
At first I got this code along with poor def quality code. Cleared the doser and ran a regen the def quality went away. But the closed loop and low moving average stayed active. These codes do derate. It’s the only code I had left and the def inducement lamps, including the red SEL were active. 5mph. I was able to clear them with the scr test like the video. Now I’m worried it will randomly come back, but I have Detroit link now. What can be done to permanently get rid of this problem? Change one box and all the sensors?
@@serggla924 I worked at a large trucking company for 8 years as a lead technician. I had this issue on several different trucks, different engine models, and different situations. We tried everything we could to find a permanent fix for this issue. I replaced all sensors, one boxes, def dosers, pumps, etc.
Nothing solved the problem permanently. As you can see if you read through the comments on this video, some people claim they have had success after doing x, y, or z.
I would not personally recommend replacing parts. I think it’s a waste of money, but if you want to try it, that’s up to you.
Best thing to do is make sure you MCM, CPC, and ACM software are up to date, inspect the entire exhaust system for any leaks, and then run the SCR test when necessary. Sorry for the bad news but I still have not heard of any permanent fix for this issue.
Question : I have OTR Performance device with app on the phone and I got and option for
“Forced SCR efficiency regen”
Is this gonna bring the nh3 value up ? Is it the same as SCR efficiency test you’re doing on the laptop ? Thank you
I’m not familiar with the OTR devices. Is there an option for a forced regen in distinction to the “forced scr efficiency regen” option?
If so, I would imagine this is the equivalent to scr efficiency test. If I were in your situation and I had some time to run the “forced SCR efficiency regens” I would go ahead and do it. If the code does not clear after the first one I would try to run it up to three times. If it doesn’t allow you to or it doesn’t clear the code, you may need to hook up with some software that can read the nh3 and perform the proper test.
@@alreyindustries okay understood . I’ll try to do that exactly , thank you sir
So should I send this driver to the dealer since you guys are saying this is just a system update ? Or is there anything else I can do to get this driver back home? Anything specifically I should be lasering in on .
You can run the scr test until the code clears. That will buy you time and will probably get you where you need to go. But to get it fixed… some people say software updates, some people say they have found other fixes, I do not know of any permanent fixes.
Anyone got a new update from freightliner or a permanent fix? Same codes took to dealer charged $300.00 to tell me the same code i told them that displayed on dash. How many trucks with the same issue? There should be a campaign or recall for this issue. Going to let the Outlet Nox sensor breath fresh air like someone stated. I hope it works.
Hi I am having Same issue..its 2019 cascadia dd15. Both new nox sensors. Dpf clean.. def doser new..software updated.efficency stayed at .95 during tests..but after 4-5 hours driving code comes back again.spn 4364 fmi17,spn 520372 and 520371..plz shed some light
I’m pretty sure those are the scr closed loop faults which this video talks about. To my knowledge there is no permanent fix to this issue. The only thing you can do is run the scr test whenever these codes come in order to get the NH3 level back up to near 1.0 %.
The only other fix I could imagine there being is programming, but if the dealer or your repair place has already programmed all the modules, then I don’t think they have come out with a real programming fix yet.
I did the same thing with him. Everything is new but code still come up. But do you recommend to keep running the truck ?
In my case one of dpf clamp was loose,check dpf wide clamp
@@AmanAndHisTruck123 these faults will not cause any significant damage to other parts of the truck. The truck is safe to continue driving.
However, if these fault codes are not corrected, the truck will go into “derate”. Then you will have to have the truck towed or whatever else until the problem is resolved.
The best thing to do is run however many scr tests it takes to get the nh3 level up to at least .99-1.0. If you only get the level up to around .91, enough to clear the codes, they will usually come back much sooner than if you were to get the level up to .99-1.0. Hope that helps.
same shit on my 2018
Information God bro
Should my temps run the same as a regen in the efficiency test?
No. During the SCR test temps usually stay around 600-700 across the board
How much you charge
Any updates ? My company has 54 2017 dd13 and closed loops everyday, we were told by dealer to chart all the nh3 bins and run repeated parked scr efficiency tests until all bins are @ 1.0 it's still only a temporary fix some trucks last 3 days some 3 weeks. I replaced the acm with one from a low milage roll over truck we had as a test still waiting for results
No permanent fixes that I’m aware of unfortunately. This has been going on for years. Don’t know why it can’t be fixed. Sorry man.
@@alreyindustries we where thinking of trying to weld some bungs further down steam and mounting the outlet nox sensors there . New one boxes have not cured the problem
@@jesselegz4312 why do you think that would help? Just curious. The reading that I’ve done on it, if I’m understanding correctly, states that the dosing is controlled by a closed loop system - meaning the feedback the ecm gets from the nox sensors determines how much def is dosed to control conversion efficiency.
Conversion efficiency is never the problem. They are almost always converting appropriately. The problem is that too much def is being required according to the closed loop parameters in order to keep conversion where it should be. The nh3 levels are detecting the amount of ammonia or unused def that is coming out of the scr. Because excessive def is being required to control the system, the code for closed loop is thrown. The problem is, nothing seems to correct the problem. I’ve replaced basically everything in the after treatment system and nothing changes. I’m stumped. I think it is a programming issue or something but I am totally baffled as to why Detroit would not correct the programming issue if that’s all it was. 🤷🏻♂️ let me know if you figure anything out.
How far back does this average go back to. Eng hr ?
Not sure what you mean?
I really wish that Detroit had implemented a function similar to Cummins' "Aftertreatment Maintenance - Reset All" feature. You still have to run the equivalent of the same tests with Cummins, but you wipe out the learned averages so you start with a clean slate and don't end up beating your head against the bricks repeatedly re-running the same test just to get a learned average above the minimum. So stupid.
I have a 2021 truck with same issue dealer will only do an efficiency test until MIL goes off and release the truck a week later lights come on..and so we go back and forth..is there a real fix for this issue?
No. This is all Detroit has released on this fault to my knowledge. I wrote in some other comments, I’ve replaced every component in the after treatment system and the code still comes back. Has to be something in the programming or something but I don’t know. Definitely a nuisance code and unfortunately this band aid fix is the only one I know of.
@@alreyindustriesany update on this issue in 2024 ?
THANKYOU SIR it worked for me had the same code and the nox code..
Did the regen and scr efficiency test.. was arpund.71.. after 1 hour of scr testing went up to .93 and codes went away...
Would the codes come back after how long ???
did a nox efficiency test eas at 98 percent.. I don't idle my truck at all have 400k only 2018 cascadia
Glad it worked for you. Every truck is a bit different. I’m working on a truck now that is back about once a week with this code while other trucks will come back maybe once a month or so. I really do not know why.
The best thing you can do is get that NH3 level as close to 1.0 as possible. That will usually get you the most time between faults.
code came back after 3 weeks
@@dell7054 yep. And it will come back after another few weeks unfortunately.
@@alreyindustries should I update the computer.. went to a dealer they wanted 500 bucks for the update...
@@alreyindustries also when i do the scr test my efficiency is at 100 percent.. should I replace the sensores.?
Any fixes for the dreaded low nox efficiency code spn 4363 fmi 18.
Well, that code is a bit different than this “closed loop” code. If these “closed loop” codes are active along with 4364, then I would follow this video.
If you are just having the 4364 efficiency code, then yes, there are fixes for that code but it could be a few different things.
@@alreyindustries we have done all the trouble shooting. Passes scr efficiency test with no problems. I personally believe this is a design flaw in the one box or a programming issue. I had scr efficiency issues with Volvos. They updated the software, and efficiency issues went away.
@@monicaallen5266 is 4364 the only code? What kind of engine? When you say it passes the efficiency test, do you mean you see that it is converting NOX at above .90% and the codes clear? Then it comes back?
@@alreyindustries we will run it through a parked regen, then run it through an scr efficiency test. Passes scr efficiency test. It throws the low nox efficiency while under a load. Sometimes it will give a bad def quality code.
Dd13 2016
Def injector (doser valve) is faulty your g/h of def should be between 500 and 800. Your DEF pump speed is too high shouldn't exceed 1200. Normal is 1100 - 1150 rpms. Your pump is working too hard because the Injector is stuck open. Need to look at ash percentage in the mcm and acm and also need to monitor the doc pressure. If it's getting up close to 1 or higher the dpfs need replaced.
What is software used for diagnostic here ? Thank u
Detroit Diesel Diagnostic Link 8
Does the standard version of this software clear fault codes and reset derates. I have a 2019 cascadia.
It will clear fault codes, but to clear derate you usually have to verify that whatever fault was causing the derate is corrected.
@@alreyindustries great. I mainly need it to run scr efficiency tests. Didnt want to buy the pro version if it's not necessary. Thanks.
@@alreyindustries so the only benefit to the pro version when it comes to newer trucks Is that the pro will update ecm and change parameters,.. is that accurate?
@@briansingleton9752 actually I think the regular version will allow you to change parameters as well. So really it’s just programming that is the difference. I think.
@@alreyindustries wow. That would be Amazing if it does. According to the website, the regular doesn't change parameters on 2017 and newer. Mine Is a 2019.. either way I'll be good with scr tests and clearing codes. Thanks. You're the man..
does this problem cause excessive def fluid consumption? And does consumption go back to normal after everything go back to normal. Thanks 😊
From what I read about the fault, yes. It is basically saying that the truck is requiring the maximum amount of def to maintain scr efficiency. Like too much DEF is being used based on the programmed parameters.
So, I’m assuming that if the problem was corrected, DEF consumption would go down. I could be wrong but that is my hypothesis.
@@alreyindustries makes sense to me.. thank you. Where can I buy the datalink software? And next time I'm In Tampa, I'm coming to show my appreciation.. its actually time to a valve lash adjustment. Hopefully you can take care of it for me.
100%? maybe crystals of def in the decomp being dissolved by the heat and fresh spray of hot def causing over efficiency, there is no way the scr can be 1005 efficient
Wondering if you might know why. But when I got the truck, I drove 7 months, almost 80k miles without this issue. Now that I'm running the scr efficiency tests, I have to run the test like every other week. Is there another test or regen I can do to prolong the time between?
Scr getting old. When you do test . The one box can reach 780f. But you run on the road . The one box only can go around 400. This is problem . The def can’t get gasify
@@thisiskingone that kinda sucks. My soot level is always good and green in the dash. Is it the scr filter itself that needs replacing?
How long does the SCR TEST TAKE?
A regular SCR test can take as little as 10-20 minutes. However, if this code is active, the scr test could take a lot longer. Depends on where your nh3 level is. It can take up to 6 hours sometimes to get the nh3 level up to where it needs to be because you may have to run multiple scr tests and a regen.
@@alreyindustries thank you it took me 1:30 after two regens
Take out the outlet nox sensor and drive. About 1000 miles No need to do SCR test. I’ll bring NH3 level to 100
did u just put the sensor on the side or just unplugged it.
Brotha did you unplug fully or put it somewhere on top of the box ?
What is best way to fix SCR system fault ?
What fault code specifically?
Hello my truck has been in shop 3 times in 10 days with this code. Everytime they run scr efficiency tests and code goes away and they release unit. But it comes back again. They have changed nox censors. What else could be the problem.
I have fought and fought and fought with this code. Replaced everything in the after treatment system, sent it to the dealer, and nothing. There is no “permanent fix”.
I think it’s a Detroit problem and should be addressed with them.
@@alreyindustries Hmm, Thanks. I took it to detroit all 3 times.
@@alreyindustriesMy truck doesn't derate or loose power when the mil light comes on with this faut code. Once i drove for 1400 kms, once 750kms and once 500kms when light pops up. How long does it usually take for truck to start derating, any idea??
@@MANINDER0242 it varies I think. I’m not sure off the top of my head. Usually, the MIL will come on, the engine light that is just solid amber. After that is on for a certain amount of time, or another code is set, the CEL comes on.
That is the engine light that has the word “check” in the middle of it. That usually indicates a more severe issue or an “ignored” issue and once a certain amount of time passes or key cycles occur, the truck will go into derate.
So if you only have the amber MIL light on you should be ok for a while, when the CEL light comes on then you have less time.
That’s usually how it works at least I think.
yep my truck is on its way back to shop for same reason. The shop tech told me that they replaced Nox sensor but after i read the invoice no nox sensor replaced. just the dose filter and nox sensor test which one has failed.
Is there a yearly fee to keep datalink software? Are there any other softwares out there that will perform the same jobs?
There are two yearly subscription options from Detroit. 1. Is around $600 and gives you access to everything basically except programming computer modules. 2. Is around $2,000 and allows you to do everything including program modules.
The second is what I was using in this video.
There are other “non-dealer” options. I also use the Diesel Laptops tablet. It cost around $3500, but it is not a yearly subscription. It allows you to connect and run tests indefinitely. However, it is not as nice and user friendly as the Detroit program.
@@alreyindustries great. Imma a DIY'er so I'll go with the Detroit option 1. But where can I purchase it.
@@thadiesel7655 it’s kind of a hassle. I actually have not bought the Detroit software for myself, just used it.
You have to create an account and stuff just to try to purchase it. You can go to diagnosticlink.nexiq.com and try to figure it out yourself or try calling an authorized dealer and maybe they can help you with it.
@@alreyindustries thank you so much.
So the $500 a year subscription will run scr efficiency test? And then you just need any laptop? Do you need internet while doing the test? Because it seems to me if I had the software to look at the code I would save money even with buying a laptop and paying $500 a month subscription... seeing how I've had the same problem as everybody else and I've replaced filters and the pump has been replaced and the nox sensors have been replaced.. where the light comes on as of now I'm pretty sure I know what it is but I'm not positive it could be something else so of course I have to bring it to the shop to get it looked at and then of course they want to run the tests again and they want to charge me at least this way I would know what it is and I can run the tests at my leisure.. they charged me $200 a pop so I figure after the 4th or 5th time will be clearing the code myself everything's already paid for itself and just like everybody else I get four days to about two and a half weeks before the code will come back on there's no telling
The basic subscription is like $600 a year. It will run the scr test and it does not require internet. The subscription payment is annual so you won’t have to pay that fee every month.
On the website they have the software requirements you need for your laptop in order to run the program.
@@alreyindustries where should I buy the cables to hook up the laptop to the truck from? Or do I need something more besides the laptop and cable
@@richardgolubiak2929 it might be a little more expensive but it would probably be best to get everything through nexiq. You need the Nexiq USB link 2, the 9 pin connector that goes from that to the truck, and then you need the USB cord that connects your computer to the USB link 2.
What does it mean if that value won’t reach the .9 to 1.0 The highest it will go is .89014
How many scr tests have you done?
I did that procedure and the engines truck ran away!!! It blew
4364 fmi 17 keeps pop out.makes me 😢
Check for exhaust leaks. Maybe at the DPF clamps under the heat shield in the one box
Or check out my other video on scr conversion efficiency
@@alreyindustries thx a lot
Sounds like a ECM software problem.
Bro same problem on my truck please help?
Only solution I know of is this video brother. There may be an ecm update that might help, but it’s a common problem.
If you’re in the Tampa Bay Area, give me a call:
Toptechdieselrepair.com
@@alreyindustries bro I did the scr efficiency test and level went to 1.00000 and after driving 4 hours 270 miles and same problem again I’m trying to reach to Bakersfield ca still stuck in El Paso TX.
Scr test means Regen?
No. Doing a regular regen will not help. You must do an actual SCR test through the Detroit or other software. The test allows the truck to get the NH3 level back up to where it wants to see it and often takes at least one test if not more and a few hours for each test.
The SCR test does put the truck into a type of regen but they are not the same thing. Unfortunately.
@@alreyindustries thank you
@@alreyindustries i have a codes 520372 and520371 you think it needs SCR test? Thanks in advance
@@MM-rl7co yes. I dealt with 520372 twice today. It is SCR closed loop. Running the test to get the nh3 level up will take care of the problem for some time. But it will come back. Make sure whoever you take it to gets the nh3 level up 1.0 or else it will come back quicker. Might think about contacting Detroit if the problem persists. The other code is related and should be taken care of by the test as well.
@@alreyindustries sorry im bothering you I have one last question, can scr problem and this codes cause de rates I mean can truck loose power and stop?
In order for me to deactivate this code by simply do force Regen 2 time and check nh3 1.00 the code would go away .
Is it works
@@kamalpatwar4800
Yes, it take me day after replacement of my Nox Outlet sensor. That's code stay on until I drive and drive def light came on . I did force Regen 2 time to get SCR quality to 1.00. I learn and follow this great technician. I watch all his videos. After force Regen 2 consecutively. I did check the nh3 and my scr is at 1.0. Than after that I did SCR quality test than the code go away after drive
Code ever came back?
code came back again
So the real solution is to replace the one box.
I can’t say that I know it will not help in every situation, but I have replaced the one box on at least one truck with this issue and the code still came back.
This code effects both heavy and medium duty engines dd5, dd8, dd13, dd15 etc.
I have been searching for a fix and replaced basically everything and updated all software. And yet still, the code comes back eventually. To my knowledge- there is no permanent fix. Only this temporary repair.
yikes I just had these 2 codes come up...
520372 16
520371 16..
so no real fix. I'd don't idle at all.. so the real fix is not the dozer pump or the def filter..
so I need to get the data link software 🤔
You could also try calling Detroit or freightliner and talk to them about help with these codes. They know it is a common problem and I hope they are offering some kind of help, but I don’t know.
@@alreyindustries Yeah I don't want to park my truck with them for a week and they r gona throw parts at it..
So do you think it would go into derare mode soon or can I keep driving like that or paysome to reset it.
@@dell7054 I just looked those codes up in the ghg 17 troubleshooting manual and it says that neither one of them will derate you.
If those are the only two active codes, according to the manual, you should be ok to continue to drive the truck.
@@alreyindustries So what would be a good way to get rid of the check engine lite..would the detroit link software get rid of the code.. I may get the software??
@@dell7054 yes, if you get the software that enables you to run the SCR test, that will cause these fault codes to go inactive. However, the software is pretty expensive. I don’t know if it would be worth it, but you would have to figure that out I guess.
I get the nh3 to 1.00 and the code is back later the same day. The only other code is 520349 14, which pops up first. Any suggestions?