If it wasnt for this video, i dont know what i would have done lol. had bought the wrong harness (old one) and luckily saw this in time and ordered the right one and was able to complete the whole job myself in about 2hrs. Very detailed video which made it a walk in the park! thank you for taking the time to make this!!
EXCELLENT HELPFUL VIDEO!!! As of 2_2020 the current part number for the GM harness that includes the sensor is 24298757 . There have been several updates but this is the lower harness only and will plug and play into the factory case connector pigtail without removing valve body (thankfully). If you have a one piece harness from case to solenoids which I have seen one time, you will have to buy both the case end and this solenoid lower half harness. The valve body would have to come down then. **Do not use aftermarket or wrong type fluid in this beast!!!!
As of 10/20 the correct part number is still 24298757 and was about $99 from my dealer with no alternate purchasing options, other than other GM on-line parts stores that is
Innovators Playground Thanks. Glad I could help. You probably can just replace the temp sensor harness now that GM has released the 2 piece again. You can find the info on my other video P0711 update.
TruckNerd I just dropped my 2016 GMC DENALI off at the dealership with code P0700 and P0711. My truck is still under warranty so I hope they do as good a job as you did. How long did that job take you?
I had a hard time finding a harness. Amazon and Rockauto don’t sell them. None of the parts shops sell them. I had to go to the dealer. It was about $99. And, my dealership didn’t have one. They sent me 20 miles away for the 1 they had. Don’t get me going on the transmission filter/ gasket, that’s a whole other story for another TH-cam video
Since at least the mid 2000s GM Truck Trans Fluid has been synthetic. 270F is the start of Coking damage and the Hot warnings to idle Veh. The Internet charts are almost all for conventional crude oil based ATF, where 220F was a damaging range. 270 to 285 Towing on hills, in desert hot weather is where you're having an issue. If there were an issue, your modern truck would have warned you and then went in to limp home if req. There was no issue in the situation you described; At all but better to worry and pay attention than to ignore it or miss it.
Great video. I'm getting the code but when driving I can look in my info and it shows a steady 175 or so. But the check engine light is intermittent. But took it to A zone and their machine said temp sensor on tranny. I can rebuild semi hermatic compressors all day but I'm not sure I want to try it. Ugh. But I probably will. Just don't want to f@&$ my truck up.
Maybe easier than this. GM made the harnesses 2 pieces again. If you can change the filter you can change the harness. th-cam.com/video/JRhYc-UjCOw/w-d-xo.html
2017 here. So OEM i should have the 2 pc harness? Only way it would have the 1pc is if the sensor was replaced at one point during the time that GM was using that 1pc harness?
Fantastic video. I appreciate your craft! In your experience how often do these temperature sensors last? Couple of years? Or depending on service, like towing a lot? Next question, is would it beneficial to delete the transmission thermostat for longer life, If the sensor failure is due to too hot of transmission fluid, moisture in fluid, etc. why do you think the sensor is failing? Thanks, in advance.
Good questions. I think this was a poor quality part issue. I had a 2016 this week with 28k on it needed one. Also I have not had to do any a second time, so looks like they fixed the issues. As far as the the thermostat delete, I could see the logic in having the transmission run cooler, but I’m not an engineer. I’m sure they have some reasoning behind it. Thanks for supporting the channel.
Great video. Have you been changing the range sensor on this transmission??? I have a 2017 Yukon I don’t have any codes nothing on my scan tool, when I go to range position it shows ourecognized state on drive mode. I’m assuming the sensor is bad but I haven’t seen any video replacing it
I have replaced one. It had set a code though. I don’t remember the code number, but I do remember it having some other symptoms. Definitely not a common problem.
That wonderful piece that seals the valve body to the rest of the transmission, the one you put trans assembly lube on, what is that piece called? Mine apparently slid down before i got the valve body back in place, and it tore.
Trucknerd, you’ve been so helpful, I have a question and cannot find an IM option. Will a half quart of Lucas multi atf do damage to my trans? Story: In my trans fill last night, I had a panic moment in the dark at the end of a day chasing mystery GM parts (yes the GM parts guy said hmmm many times) when realizing I was going to be short on fluid. I added 1/2 qt of Lucas multi vehicle atf In addition to the 6 qts of mobil1 blue label synthetic added to replace the 6qts I sucked out. An additional 1qt was lost in the filter and in the pan when dropped. I then realized I should have just added back a qt of the old 6 I removed. However, when starting the truck and removing the overfill plug, I lost none. I presume I was low to begin with, or just at the mark- who could tell? Have I done harm by adding the half qt of multi and should I buy another box of 6 blue label and keep adding until full or just buy 2 boxes and attempt to flush it all? Other details... ‘16 high country 1500 5.3l w/97k using Dexron6. Lucas says it meet/ exceeds Dexron3. Tech specs says not recommended for Dexron6. I presume dex3 is missing a few components of dex6, tough to research without a chemistry degree. Thanks for your efforts on this channel
reedrobb I messaged mobile one & ask about the fluid. I specifically asked if if the synthetic fluid would work in a vehicle that requires Dexron VI. They advised the two fluids to not be compatible. If it were me I would have the transmission flushed because the fluid used in these before 12/2018 would need to be changed anyway due to the shudder issue. Google 18-NA-355.
Which year models are the one piece harnesses? I have a 2016 Yukon XL Denali 6.2/8L90. Im hoping it is a two piece harness and not have to get that deep into it.
I noticed that you have two videos related to the temp sensor. I am guessing the Dec. vid is the correct one to use to fix the erratic temp sensor? I really don't want to mess with removing the valve body to fix this issue, if I just need to R&R the bottom harness. Any reason that I would need to replace the entire harness?
Did this cure the harsh shifting or the shudder? Mine was throwing po711 and po700,its still under warranty and I took it in because it had the rumble strip feeling when shifting. And the dealer told me it needed a new harness to start.
The transmission shudder is fixed with a transmission flush & the correct fluid being used. The p0711 will require the harness. Sounds like you need both. The flush is uses 20 quarts of fluid and just changing the harness you will use 10. Unless they flush the entire system including the cooler, the shudder will return.
I did everything in this video went on a test drive truck does not go into 3 gear. Should i drop pan and inspect wires or could it be low in fluid i missed the last step in draining. Thank you 🙏
Definitely make sure it’s full of fluid. It’s my understanding that there are two wires that can be crossed in the rear of the transmission. I would expect codes to be set if that’s the case.
I had the same problem on my 2016 Silverado, at the beginning of engine light came on, however after a few days the engine light went away. Do you have any idea what could have caused the engine light to disappear?
@jg2449 same here! I've had bad shifts for 2 years but CEL only came on once. I'm now going to get the sensor replaced. I hope there is no permanent damage done from the hard shifts
I have a 2015 Chevy Silverado 1500 with a 6.2 leader in it. It has a bad tapping noise. I have put the AMF delete kit on it, replaced the fuel pump, fuel filter, fuel injector, spark plugs, spark plug wires damn near everything and the tapping hasn't gone away. Please let me know if there is a way to get rid of it? Thank you
I accidentally took off that piece at the bottom with that all those connectors on the left plug into. There are some little bb like plastic piece that fell out. Any idea what these are an where they go?
Hello sir I have a 2007 Silverado 1500 4.8 8 cyl. And the transmission heats ups fast then goes into limp mode and the faster I go the faster it heats up. And I took it to several shops and no one seems to know what’s wrong one of the shops installed a cooler and it did not fix the problem another shop installed a radiator and that did not fix the problem they have ran the truck with the scanner connected adn they say the transmission runs fine and it shifts fine too until it goes above 200 it doesn’t want to accelerate right until like next day it accelerates fine and it doesn’t have the check engine light on or does it have codes so I would really appreciate what do you think it could be. I’m just very tired of going to shops putting money into it and nothings fixed I appreciate your time. God bless all of you for posting videos and helping each other out that’s how the world is suppose to be!
can you mix the transmission fluid you recommended with factory oil? I bought 6 quarts of mobil 1 and it won’t be enough. I drained closer to 9 quarts. If not should I go get the fluid from gm?
If you are asking if the mobile 1 fluid from GM is compatible with what is already in the transmission, yes it’s fine. The mobile 1 fluid from GM is the only fluid I would use.
TruckNerd Thanks! I went into the dealership and they gave me the same exact fluid. I didn’t think they carried mobil 1. I just finished my install and gave you a shoutout for those needing to drop the valve body. I hope you get more subs and can monetize. Your channel deserves more subs! Thanks again! 🙌🏼
I need to have the service done and would tackle it myself but I have no shop at this moment. I keep talking to mechanics saying they need to have a programmer come out and “flash” the control module and it’s an extra 300 dollars. Is there any truth to this?
Trucknerd i have a 2016 sierra with 46000 miles. And the check engine light came on with po700 and po711 codes. But the truck runs nice and smooth idk whats going on. Do u have any idea?
German Arreola p0711 is for the temp sensor. If it reads zero, there is a problem. If you don’t feel comfortable then your local dealer can check it for you.
Will it cause damage to drive/tow if this code came on? It came on once today cleared the code truck runs and drives as normal, coolant temps are normal and trans temps are normal.
The 1-2 shift the first one of the day is normal. After that I would check for software updates then do a “fast learn” procedure to reset the shift points & drive it to get it to learn them. I’ve had pretty good success this way, but harsh shifting seems to be a characteristic of these.
I have a 2015 yukon denali xl... I'm getting p0700 and p0711. Can I replace just the temp sensor harness or do I have to replace the whole harness with dropping g the valve body?
Where can I purchase the harness? I feel I’ve searched the Internet over with no exact match. Please advise. Thanks in advance. I have code P0700 and P0711 out of warranty but no shudder. Just CEL on.
how do I figure out if it's the sensor or the gauge? the needle on the gauge never moves. it's for a 2004 GMC Topkick 5500. I'm not getting any error codes so I'm thinking maybe gauge
This repair does not apply to your truck. I’m not familiar the 5500 trucks. If it’s the same as the 2500 I would say that’s right. Those gauge motors are faulty on those.
Cadillac Escalade 2019 (8L90 automatic transmission). What current kit of spare parts is needed for this repair? We're talking about part numbers - what to order. The automatic transmission temperature shows 20-30 degrees lower than the real one, after warming up the car it shows normally, but after a long period of parking shows wrong again. Cadillac Escalade 2019 (АКПП 8L90). Какой актуальный комплект запчастей нужен для данного ремонта? Речь об артикулах - что заказывать. Температуру АКПП показывает на 20-30 градусов ниже реальной, после прогрева авто показывает нормально, но после длительной стоянки все по новой.
@@TruckNerdsorry but it didn’t help. on the purchased part there is a female connector, but on the board that is installed in the car there is no connector at all, the wire goes somewhere deep into the automatic transmission. Sorry for my english (I’m from Russia)
Will this help if tranny is shuddering when it gets hot around 160ish degrees? The only transmission fault i have is the p0711. Complaining of vibration/shaking when going highway speeds. Might just end up doing the whole trans. Thanks!
Typically the 8 speed shudder problem is around 45mph, so not highway speeds. The shudder is fixed with a fluid flush. When you change the harness you change 7 quarts. Might be worth a shot.
Im not sure if messed up on something but I’m not being able to put my car in D. It goes into R and N but not smooth as it should… Any thoughts? Thank you.
Does anyone have the part # for just the lower harness? I have the erratic temp sensor that triggers the CEL fir a few days then goes away for a few days then back again
Scott, I would agree with truck nerd. Mine flashed a code off and on for a week before it failed. Then received codes P0700 and P0711. It’s been a short time but replacing the harness seems to have solved the problem.
That depends on the capabilities of the regular mechanic. If your vehicle has the two piece harness it’s even easier. If they can change a transmission filter, they can change the harness. This repair should be approximately $500 in most cases. If the whole valve body is dropped it will be more.
@@TruckNerd thank you for the quick reply. I forgot to mention P0700 & P0711 came up at the same time, does that make a difference or is it related to the same problem. Thanks in advance.
Doesn’t sound normal unless it’s like 100 degrees outside where you live. You should monitor the temperature as it comes up to operating temperature. You want a smooth increase with no jumps. If it’s jumping around you definitely need the harness replaced.
To add to this description, the error code for P0711 and P0700 refer to the transmission control system and the Transmission fluid temperature sensor A.
ok I'm having problems with shifting and the engine revs high like its in neutral with poor acceleration I'm thinking that it might be a bad ecm it's an 2011 gmc sierra 1500
The 6l80 has transmission control module mounted to the valve body. The temp sensor is internal to the module. So it’s similar in the fact you will have to remove the valve body, but everything else is different.
@@TruckNerd Bummer! Was hoping for a two-piece harness for my '16 silverado that I could do myself with ease for the temp sensor. Do you happen to know a part# for the '16 silverado LTZ 4x4 6L80?
@@TruckNerd Nevermind, I think I understand that on the 6L80 the thermistor is not part of any harness and is integral to the control solenoid body / TCM and can't be serviced separately. Go GM!
www.gmpartscenter.net/oem-parts/gm-s-harness-24297369 This is one place to get it. Ebay also has it. I suggest getting it from your local GM dealer in case of any changes.
Did this exactly except I just got the lower harness, double checked everything... then pan on and hooray my temp sensor is good but now all of the fuckin pressure control solenoids are open circuit... I have a picture of them all plugged in and the truck drives just fine. The live data says trans ok to crank and the Engine light does not illuminate but when reading the codes 1 through 4 are open circuit. Im reading good line pressures and I'm 100% sure my wiring harness is the correct part number. Im thinking its got to be the upper harness or I've just not pushed the connectors in enough like a dimwit. That or the dielectric grease my smart ass put a generous glob of on the outer plug has insulated the grounds to the solenoid. Anytyhing helps and ill be sure to reply what happens next if anyone is interested what it turns out to be.
@@CCGORE Sounds like you were very careful and do good work. The only thing I can think of is maybe the large connector inside that connects the two harnesses together may not be all the way in before latched down. Also some people have swapped a purple wire at the rear of the transmission. In both of these cases I would still expect to have a drive ability concern. Keep us informed.
@@TruckNerd After countless tests with the multimeter, cleaning connections quintuple checking everything taking the pan off 3 times, and bathing in ATF, I have now learned what PDTCs are. Since it was a permanent code it needed the battery disconnect treatment then to have everything reinstalled (probably unessesary), and a heat cycle + fast learn procedure to convince it to look at the solenoids and see they are in fact connected and being used. Shifts tremendously better from the new fluid too. I couldn't be more thankful you actually responded, if I hadn't of opened it back up to check what you recommended I wouldn't have found one of the little cover pieces off of the rear connectors that decided to pop off in the pan. best of luck to you.
Oel Rincón; My truck doesn’t have a dipstick, I sucked out 6 quarts and lost approx 1 in the pan and filter. Added back approx 8 quarts and it was still low. If you have a dipstick, it’s much easier.
@@TruckNerd Thanks so much for making, and posting this extremely helpful video. I have a '15 yukon denali which was just diagnosed by my dealer as needing the trans temp sensor replaced, at a cost of $1,400 (symptom was engine radiator cooling fans were always running on full high speed (fans were on 100% of the time). After seeing your video, I am confident that I can perform this repair myself. Can you please elaborate a bit on the "new" seperate sensor harness? It sounds like this would make the job much easier since you are saying that there is no need to drop the valve body, disengage the pump, etc? Thanks Again!
@@TruckNerd First of all thank you very much for the reply. Second, any idea💡what could be the issue with my pickup? It's a 2007 gmc sierra classic, with a 6.0 liter engine. Any help is much appreciated. Only the transmission is overheating
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I cannot express the level of how thankful I am that you loaded this video up, and with so much detail. Thank you for this!
Thank you for the kind words an your support.
I can not find the automatic transmission wiring harness... where do I get it at my temp sensor is out throwing code p0711
Yes for real!!!!!
Finally someone who shows us the proper fluid level check procedure after doing this job. Well done sir. Cheers from Canada! 🎉🎉
@@jaybilawchuk2225 Thank you!
Just did this job this morning. This video helped out immensely. Thank you
Your welcome. Congratulations you just saved yourself some 💰!
Excellent video, great explanation and camera-work.
If it wasnt for this video, i dont know what i would have done lol. had bought the wrong harness (old one) and luckily saw this in time and ordered the right one and was able to complete the whole job myself in about 2hrs. Very detailed video which made it a walk in the park! thank you for taking the time to make this!!
So glad you gained some value from this video. Thanks for watching.
What model and truck are you working on buddy
@@francishickman488 2015 GMC yukon denali
Which one is the right one part # ??
Thank you brother. I'll be doing this, this weekend.
Well there goes my hope for an easy fix…
Uhhhhhhhhhhhhhhh, ok so off to the mechanic I go. That is no party! VERY well filmed.
Thank you.
EXCELLENT HELPFUL VIDEO!!! As of 2_2020 the current part number for the GM harness that includes the sensor is 24298757 . There have been several updates but this is the lower harness only and will plug and play into the factory case connector pigtail without removing valve body (thankfully). If you have a one piece harness from case to solenoids which I have seen one time, you will have to buy both the case end and this solenoid lower half harness. The valve body would have to come down then. **Do not use aftermarket or wrong type fluid in this beast!!!!
Exactly
I was just about to ask the difference between the 24298757 and 24297369 but it seems the 8757 is just the updated version. Thank you for this comment
As of 10/20 the correct part number is still 24298757 and was about $99 from my dealer with no alternate purchasing options, other than other GM on-line parts stores that is
Nice job! I’ve been wanting to do this for a while, but was apprehensive since the 8l90 is not like the old days units.
Innovators Playground Thanks. Glad I could help. You probably can just replace the temp sensor harness now that GM has released the 2 piece again. You can find the info on my other video P0711 update.
Great freakin video!!! Well done with great camera angles. Very informative. Thank you for sharing.
Rich Barrios I appreciate that.
TruckNerd I just dropped my 2016 GMC DENALI off at the dealership with code P0700 and P0711. My truck is still under warranty so I hope they do as good a job as you did. How long did that job take you?
Rich Barrios It takes a couple of hours as long as the truck is not hot. Getting parts is the problem right now.
Thank you so much for this great video! You are a life saver to many of us!
Thank you. Hopefully it helps lots of people!
Whew, thank the GM gods for the 2 piece harness
reedrobb they can’t make there mind up. 2 piece then 1 piece, now two pieces again.
I had a hard time finding a harness. Amazon and Rockauto don’t sell them. None of the parts shops sell them. I had to go to the dealer. It was about $99. And, my dealership didn’t have one. They sent me 20 miles away for the 1 they had. Don’t get me going on the transmission filter/ gasket, that’s a whole other story for another TH-cam video
Since at least the mid 2000s GM Truck Trans Fluid has been synthetic. 270F is the start of Coking damage and the Hot warnings to idle Veh. The Internet charts are almost all for conventional crude oil based ATF, where 220F was a damaging range. 270 to 285 Towing on hills, in desert hot weather is where you're having an issue. If there were an issue, your modern truck would have warned you and then went in to limp home if req. There was no issue in the situation you described; At all but better to worry and pay attention than to ignore it or miss it.
I was wondering why the 8L90e didn't have a level plug. Thanks for showing me where it's at.
No problem
Awesome and very helpful. Thank You
Thank you
Thank you for the video I have a 2018 GMC SIERRA with that transmission the LV fluid is in the Ford's to the converters has problems with shutting
Thanks for watching.
A master at work. Thank you.
Thank you!
@@TruckNerd my temperature for transmission pop up and I changed the fluid but no sensors. did you run the same issue ?
@@isthatyou510 if the transmission temperature is erratic, you need to replace the sensor.
@@TruckNerd cold start its at 90 but the highest it goes is 190 max 196 then drops to 190. but nothing. close to erratic. thanks
Great video. I'm getting the code but when driving I can look in my info and it shows a steady 175 or so. But the check engine light is intermittent. But took it to A zone and their machine said temp sensor on tranny. I can rebuild semi hermatic compressors all day but I'm not sure I want to try it. Ugh. But I probably will. Just don't want to f@&$ my truck up.
Maybe easier than this. GM made the harnesses 2 pieces again. If you can change the filter you can change the harness. th-cam.com/video/JRhYc-UjCOw/w-d-xo.html
2017 here. So OEM i should have the 2 pc harness? Only way it would have the 1pc is if the sensor was replaced at one point during the time that GM was using that 1pc harness?
Or if you have the auto stop feature.
Fantastic video. I appreciate your craft! In your experience how often do these temperature sensors last? Couple of years? Or depending on service, like towing a lot?
Next question, is would it beneficial to delete the transmission thermostat for longer life, If the sensor failure is due to too hot of transmission fluid, moisture in fluid, etc. why do you think the sensor is failing?
Thanks, in advance.
Good questions. I think this was a poor quality part issue. I had a 2016 this week with 28k on it needed one. Also I have not had to do any a second time, so looks like they fixed the issues. As far as the the thermostat delete, I could see the logic in having the transmission run cooler, but I’m not an engineer. I’m sure they have some reasoning behind it. Thanks for supporting the channel.
What is the approximate cost for a reputable shop to do this work?
Thanks for the video. What were the symptoms of having a bad temperature sensor?
M Giovanni Hard shifts & check engine light.
Mine tripped codes. P0700 and P0711. Just added the harness today and cleared the codes. Now I need to drive it but crossing my fingers as we speak.
@@reedrobb dude they want almost 1k$ to fix it at a dealership, theres no way with their experience it should be that much
Excellent video. Thank you
Thanks for watching. Hope it helped.
Great video. Have you been changing the range sensor on this transmission??? I have a 2017 Yukon I don’t have any codes nothing on my scan tool, when I go to range position it shows ourecognized state on drive mode. I’m assuming the sensor is bad but I haven’t seen any video replacing it
I have replaced one. It had set a code though. I don’t remember the code number, but I do remember it having some other symptoms. Definitely not a common problem.
That wonderful piece that seals the valve body to the rest of the transmission, the one you put trans assembly lube on, what is that piece called? Mine apparently slid down before i got the valve body back in place, and it tore.
Just a seal. Not sure what the catalog calls it.
Trucknerd, you’ve been so helpful, I have a question and cannot find an IM option. Will a half quart of Lucas multi atf do damage to my trans?
Story: In my trans fill last night, I had a panic moment in the dark at the end of a day chasing mystery GM parts (yes the GM parts guy said hmmm many times) when realizing I was going to be short on fluid. I added 1/2 qt of Lucas multi vehicle atf In addition to the 6 qts of mobil1 blue label synthetic added to replace the 6qts I sucked out. An additional 1qt was lost in the filter and in the pan when dropped. I then realized I should have just added back a qt of the old 6 I removed. However, when starting the truck and removing the overfill plug, I lost none. I presume I was low to begin with, or just at the mark- who could tell? Have I done harm by adding the half qt of multi and should I buy another box of 6 blue label and keep adding until full or just buy 2 boxes and attempt to flush it all? Other details... ‘16 high country 1500 5.3l w/97k using Dexron6. Lucas says it meet/ exceeds Dexron3. Tech specs says not recommended for Dexron6. I presume dex3 is missing a few components of dex6, tough to research without a chemistry degree.
Thanks for your efforts on this channel
reedrobb i have not used that particular fluid. I wouldn’t be comfortable advising you to use anything other than what is recommend.
reedrobb I messaged mobile one & ask about the fluid. I specifically asked if if the synthetic fluid would work in a vehicle that requires Dexron VI. They advised the two fluids to not be compatible. If it were me I would have the transmission flushed because the fluid used in these before 12/2018 would need to be changed anyway due to the shudder issue. Google 18-NA-355.
Which year models are the one piece harnesses?
I have a 2016 Yukon XL Denali 6.2/8L90. Im hoping it is a two piece harness and not have to get that deep into it.
Probably 95% of the ones I have done have been the 2 piece. No real way to tell without putting eyes on it.
@@TruckNerd shucks... Guess I'll be changing the fluid and filter twice then. Can't have it sitting for more than a weekend.
Do you know the part number for the 2 torque to yield bolts by chance. Thanks for the DIY video, big help!
Pump Baffle Bolts 11548404
Searching that number comes up with the transmission pan bolt. I ordered 2 so hopefully that’s correct. Thanks for the help!
@@TC323i were they the right ones?
excellent video thanks was a great help!!!!!
Glad I could help.
Awesome video man!
Thanks. Hope it helps.
I noticed that you have two videos related to the temp sensor. I am guessing the Dec. vid is the correct one to use to fix the erratic temp sensor? I really don't want to mess with removing the valve body to fix this issue, if I just need to R&R the bottom harness. Any reason that I would need to replace the entire harness?
No sir. Just place the lower portion. The easier one. No need to remove the valve body any more.
You’re the man! Thanks for the great videos!
@@TruckNerd I removed the valve now truck has issues with 4th gear any idea
@@jorgegarza234 I’ve had a couple of people say that they had a couple of wires swapped. That would be the only thing I can think of.
@@TruckNerd so are the connectors dummy proof or no and do u need to reprogram shifts if u drop valve body
Excellent video. Very well done
Thank you
You’re the man
Lol. Thank you.
Is it possible to know which one is the updated harness ? I’m seeing 6895 in your description and 8757 in the comments
It has changed part numbers since the 8757. I believe the 6895 is the most current one.
Did this cure the harsh shifting or the shudder? Mine was throwing po711 and po700,its still under warranty and I took it in because it had the rumble strip feeling when shifting. And the dealer told me it needed a new harness to start.
The transmission shudder is fixed with a transmission flush & the correct fluid being used. The p0711 will require the harness. Sounds like you need both. The flush is uses 20 quarts of fluid and just changing the harness you will use 10. Unless they flush the entire system including the cooler, the shudder will return.
You rock, thanks man!
Glad I could help
I did everything in this video went on a test drive truck does not go into 3 gear. Should i drop pan and inspect wires or could it be low in fluid i missed the last step in draining. Thank you 🙏
Definitely make sure it’s full of fluid. It’s my understanding that there are two wires that can be crossed in the rear of the transmission. I would expect codes to be set if that’s the case.
@@TruckNerd wires were crossed bro now she shifting smooooth thank you man🤌🏻🙏🙏🙏 topped it off with fluid too
@@cristianeduardo019 that’s awesome you got it figured out. Good job.👍🏻
I have the code on the 8L45, it is the same procedure and part numbers
I had the same problem on my 2016 Silverado, at the beginning of engine light came on, however after a few days the engine light went away.
Do you have any idea what could have caused the engine light to disappear?
The temp sensor is right on the border of the failing parameters. It will come on again.
@@TruckNerd Took truck to dealer the harness and temp sensor out of warranty but GM made it good thanks.
mines been doin it for 2 years off for a week then on for a day then off for a week, then on again, its always shifted rough from 1-2 though
@jg2449 same here! I've had bad shifts for 2 years but CEL only came on once.
I'm now going to get the sensor replaced. I hope there is no permanent damage done from the hard shifts
I have a 2015 Chevy Silverado 1500 with a 6.2 leader in it. It has a bad tapping noise. I have put the AMF delete kit on it, replaced the fuel pump, fuel filter, fuel injector, spark plugs, spark plug wires damn near everything and the tapping hasn't gone away. Please let me know if there is a way to get rid of it? Thank you
Dong Johnson I’ve had a few of these that tick without a misfire & it’s been a bent pushrod. Try that.
@@TruckNerd Your right it was a bent pushrod so I replaced all the pushrods and now it still has that tapping. Thank you for the info too
I accidentally took off that piece at the bottom with that all those connectors on the left plug into. There are some little bb like plastic piece that fell out. Any idea what these are an where they go?
I have never seen that before. Sorry.
@@TruckNerd just researched that they are called “check balls”
Hello sir I have a 2007 Silverado 1500 4.8 8 cyl. And the transmission heats ups fast then goes into limp mode and the faster I go the faster it heats up. And I took it to several shops and no one seems to know what’s wrong one of the shops installed a cooler and it did not fix the problem another shop installed a radiator and that did not fix the problem they have ran the truck with the scanner connected adn they say the transmission runs fine and it shifts fine too until it goes above 200 it doesn’t want to accelerate right until like next day it accelerates fine and it doesn’t have the check engine light on or does it have codes so I would really appreciate what do you think it could be. I’m just very tired of going to shops putting money into it and nothings fixed I appreciate your time. God bless all of you for posting videos and helping each other out that’s how the world is suppose to be!
can you mix the transmission fluid you recommended with factory oil? I bought 6 quarts of mobil 1 and it won’t be enough. I drained closer to 9 quarts. If not should I go get the fluid from gm?
If you are asking if the mobile 1 fluid from GM is compatible with what is already in the transmission, yes it’s fine. The mobile 1 fluid from GM is the only fluid I would use.
TruckNerd Thanks! I went into the dealership and they gave me the same exact fluid. I didn’t think they carried mobil 1.
I just finished my install and gave you a shoutout for those needing to drop the valve body. I hope you get more subs and can monetize. Your channel deserves more subs! Thanks again! 🙌🏼
@@dannyjohnsonsgarage Glad I could help. Thank you for your support! Thats what it's all about.
I need to have the service done and would tackle it myself but I have no shop at this moment. I keep talking to mechanics saying they need to have a programmer come out and “flash” the control module and it’s an extra 300 dollars. Is there any truth to this?
A lot of the time I don’t reflash the computer. You can do the repair, then see if it’s shifting okay. If not then have it reflashed.
Im sure I may have missed it in the video, but how do you determine which harness you have between the one and two piece versions?
Could be either. But 95% of the ones I have seen are two pieces.
Thank u so much for this video I wish for u the best always thank u thank u sooooo much🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡🫡
I admit its okay to pay the mechanic for this job
Lol. I agree.
Where can I buy the wiring harness??
Your dealer has the harness. I have also seen them on EBay.
Trucknerd i have a 2016 sierra with 46000 miles. And the check engine light came on with po700 and po711 codes. But the truck runs nice and smooth idk whats going on. Do u have any idea?
German Arreola sounds like it’s going to need the transmission harness replaced.
@@TruckNerd i chek the transmission temp and the temperature dont move its stays at zero. I checked i on the dashboard
German Arreola p0711 is for the temp sensor. If it reads zero, there is a problem. If you don’t feel comfortable then your local dealer can check it for you.
@@TruckNerd am taking the truck in today. I will let u know what they tell me later on today!!! Thank you.
The dealer have my truck already they supposed to check it next week. So i will keep u updated with this prosses!!!
If you have a bad temp sensor and replace it should you flush the fluid or just change it?? Got a cts thanks
If it hasn’t been flushed already might as well take care of it now and be done with it.
Will it cause damage to drive/tow if this code came on? It came on once today cleared the code truck runs and drives as normal, coolant temps are normal and trans temps are normal.
Trans temperature is most likely erratic. The transmission may have or develop abnormal shifting characteristics. I would have it replaced soon.
Hey buddy the dealer shop just replaced my transmission wire harness and now some time my transmission shifts very hard ,what's going on with it?
The 1-2 shift the first one of the day is normal. After that I would check for software updates then do a “fast learn” procedure to reset the shift points & drive it to get it to learn them. I’ve had pretty good success this way, but harsh shifting seems to be a characteristic of these.
GREAT HELPFULL VIDEO
Thank you. Also check the updated video for an easier procedure.
I have a 2015 yukon denali xl... I'm getting p0700 and p0711. Can I replace just the temp sensor harness or do I have to replace the whole harness with dropping g the valve body?
Shaun Judkins GM has released the two piece harness again. You can now just replace the the half you need without removing the valve body.
Where can I purchase the harness? I feel I’ve searched the Internet over with no exact match. Please advise. Thanks in advance. I have code P0700 and P0711 out of warranty but no shudder. Just CEL on.
Daniel Griffin the harness is on backorder right now.
TruckNerd great...this situation couldn’t get any better. Very dissatisfied with the way GM has handled this entire fiasco.
Daniel Griffin Understandable. Hopefully they will get these out ASAP!
Is there a way to tell before I tear into my 2017 Yukon denalli if it has the one piece or two piece harness ?
Almost every 2017 I have done has been the two piece design. I’m not aware of any way to tell without putting your eyes on it.
how do I figure out if it's the sensor or the gauge? the needle on the gauge never moves. it's for a 2004 GMC Topkick 5500. I'm not getting any error codes so I'm thinking maybe gauge
This repair does not apply to your truck. I’m not familiar the 5500 trucks. If it’s the same as the 2500 I would say that’s right. Those gauge motors are faulty on those.
@@TruckNerd thanks
Cadillac Escalade 2019 (8L90 automatic transmission). What current kit of spare parts is needed for this repair? We're talking about part numbers - what to order. The automatic transmission temperature shows 20-30 degrees lower than the real one, after warming up the car it shows normally, but after a long period of parking shows wrong again.
Cadillac Escalade 2019 (АКПП 8L90). Какой актуальный комплект запчастей нужен для данного ремонта? Речь об артикулах - что заказывать. Температуру АКПП показывает на 20-30 градусов ниже реальной, после прогрева авто показывает нормально, но после длительной стоянки все по новой.
24046895
@@TruckNerdsorry but it didn’t help. on the purchased part there is a female connector, but on the board that is installed in the car there is no connector at all, the wire goes somewhere deep into the automatic transmission. Sorry for my english (I’m from Russia)
What is post be the average temperature for Silverado 8 speed
Joseph Breen in normal driving they seem to run pretty close to 200 degrees. The thermal bypass does not open until 194 degrees.
Do you know why they changed it to a one piece harness?
I imagine they were trying to save money. Now it’s a two piece again. Much simpler.
i have an 8l90 throwing p0717 code
Will this help if tranny is shuddering when it gets hot around 160ish degrees? The only transmission fault i have is the p0711. Complaining of vibration/shaking when going highway speeds. Might just end up doing the whole trans. Thanks!
Typically the 8 speed shudder problem is around 45mph, so not highway speeds. The shudder is fixed with a fluid flush. When you change the harness you change 7 quarts. Might be worth a shot.
@@TruckNerd Roger that starting with a flush first. Thanks boss I’ll keep you posted. Your videos always save me too
Thank you so much, where did you get the new harness?
From the dealer
@@TruckNerd thank you
dealer wants 1k$ to fix this, its a 75$ part , how do you fill the fluid back up if theres not dip stick for fluid
I use a mighty vac that will pump fluid out, remove the plug & pump it in that way.
Im not sure if messed up on something but I’m not being able to put my car in D. It goes into R and N but not smooth as it should… Any thoughts? Thank you.
Apparently there is a purple connector & a white connector in the rear that can be swapped. Check there.
@@TruckNerd is it next to the shift cable?
@@pedrofenix4222 from my understanding it’s 2 of the 3 connectors in the rear.
@@TruckNerd Im kinda lost not gonna lie 😂 where are the connectors at? Thank you for your patience!
@@pedrofenix4222 just check them all then.
Does anyone have the part # for just the lower harness? I have the erratic temp sensor that triggers the CEL fir a few days then goes away for a few days then back again
scott barth part #24298757 is the updated harness.
Scott, I would agree with truck nerd. Mine flashed a code off and on for a week before it failed. Then received codes P0700 and P0711. It’s been a short time but replacing the harness seems to have solved the problem.
Why can’t I find this dam harness any help ?
Can you change the temp sensor without pulling the whole harness off?
No, but the two piece harness that is now out is much simpler.
how do u find out if u have the one piece or two piece sensor
Unfortunately there is no 100% way to know for sure, almost every one I have done is the two piece design now.
Is it the same on the L86 transmission I have the same code p0711 ?
L86 is an engine code. The transmission code to look for this 8 speed is M5U. More than likely your transmission is the M5U.
Can regular mechanic do this or do I have to take it to the dealer? Is this expensive?
That depends on the capabilities of the regular mechanic. If your vehicle has the two piece harness it’s even easier. If they can change a transmission filter, they can change the harness. This repair should be approximately $500 in most cases. If the whole valve body is dropped it will be more.
@@TruckNerd thank you for the quick reply. I forgot to mention P0700 & P0711 came up at the same time, does that make a difference or is it related to the same problem. Thanks in advance.
@@javier214dtx just seen this. Yes. Same problem.
Where are you located?
When I cold start my truck the transmission temp reads 95 is that normal?? Any suggestions
Doesn’t sound normal unless it’s like 100 degrees outside where you live. You should monitor the temperature as it comes up to operating temperature. You want a smooth increase with no jumps. If it’s jumping around you definitely need the harness replaced.
you know if this parts will fit in Chevy Silverado 2007 v6 4.3 new body
It will not.
Ok thanks for your help
Great Video
Thanks for watching
Whats the name of the part ?
Its the transmission control Harness part number 24297369
To add to this description, the error code for P0711 and P0700 refer to the transmission control system and the Transmission fluid temperature sensor A.
what are the symptoms of a bad one?
Check engine light can come on, but it takes two failures in a row. Harsh shifts can occur as well.
ok I'm having problems with shifting and the engine revs high like its in neutral with poor acceleration I'm thinking that it might be a bad ecm it's an 2011 gmc sierra 1500
@@tommyfpv5476 that’s definitely not this transmission.
Would this be the same on a 2017
1500 Denali thanks
As long as it has the 8 speed transmission, yes it’s the same.
Same procedure (approx) for the 6L80?
The 6l80 has transmission control module mounted to the valve body. The temp sensor is internal to the module. So it’s similar in the fact you will have to remove the valve body, but everything else is different.
@@TruckNerd Bummer! Was hoping for a two-piece harness for my '16 silverado that I could do myself with ease for the temp sensor. Do you happen to know a part# for the '16 silverado LTZ 4x4 6L80?
@@TruckNerd Nevermind, I think I understand that on the 6L80 the thermistor is not part of any harness and is integral to the control solenoid body / TCM and can't be serviced separately. Go GM!
Can you post link to where to get it
www.gmpartscenter.net/oem-parts/gm-s-harness-24297369
This is one place to get it. Ebay also has it. I suggest getting it from your local GM dealer in case of any changes.
Did this exactly except I just got the lower harness, double checked everything... then pan on and hooray my temp sensor is good but now all of the fuckin pressure control solenoids are open circuit... I have a picture of them all plugged in and the truck drives just fine. The live data says trans ok to crank and the Engine light does not illuminate but when reading the codes 1 through 4 are open circuit. Im reading good line pressures and I'm 100% sure my wiring harness is the correct part number. Im thinking its got to be the upper harness or I've just not pushed the connectors in enough like a dimwit. That or the dielectric grease my smart ass put a generous glob of on the outer plug has insulated the grounds to the solenoid. Anytyhing helps and ill be sure to reply what happens next if anyone is interested what it turns out to be.
@@CCGORE Sounds like you were very careful and do good work. The only thing I can think of is maybe the large connector inside that connects the two harnesses together may not be all the way in before latched down. Also some people have swapped a purple wire at the rear of the transmission. In both of these cases I would still expect to have a drive ability concern. Keep us informed.
@@TruckNerd After countless tests with the multimeter, cleaning connections quintuple checking everything taking the pan off 3 times, and bathing in ATF, I have now learned what PDTCs are. Since it was a permanent code it needed the battery disconnect treatment then to have everything reinstalled (probably unessesary), and a heat cycle + fast learn procedure to convince it to look at the solenoids and see they are in fact connected and being used. Shifts tremendously better from the new fluid too. I couldn't be more thankful you actually responded, if I hadn't of opened it back up to check what you recommended I wouldn't have found one of the little cover pieces off of the rear connectors that decided to pop off in the pan. best of luck to you.
@@CCGORE Good job. Glad you got it fixed!
Hoy many quarts of Mobil 1 Oil do i need for the process?
Oel Rincón; My truck doesn’t have a dipstick, I sucked out 6 quarts and lost approx 1 in the pan and filter. Added back approx 8 quarts and it was still low. If you have a dipstick, it’s much easier.
@@reedrobb how do you know it’s low if you don’t have a dipstick?
NOTHING will come out the overfill plug
th-cam.com/video/dPrP4NQZg6w/w-d-xo.html This video will explain it all
GMC Sierra 2013 1500 sle transmission getting overheating
Thank you
Dan pal Thanks for watching. GM has now released the the sensor harness separately, so it can be replaced without removing the valve body.
Oh good thanks
@@TruckNerd Do you know the new part number of the separate sensor harness?
Riley Pup 24298757
@@TruckNerd Thanks so much for making, and posting this extremely helpful video. I have a '15 yukon denali which was just diagnosed by my dealer as needing the trans temp sensor replaced, at a cost of $1,400 (symptom was engine radiator cooling fans were always running on full high speed (fans were on 100% of the time). After seeing your video, I am confident that I can perform this repair myself. Can you please elaborate a bit on the "new" seperate sensor harness? It sounds like this would make the job much easier since you are saying that there is no need to drop the valve body, disengage the pump, etc? Thanks Again!
What year is this vehicle?
This problem seems to happen on 2014-2019 8l90’s
I hope it will be translated into Arabic so that we know and thank you
Nice 👍
Does this apply to the 2007 gmc sierra with the 6.0 motor? Thanks in advance
No sir. Different transmission.
@@TruckNerd First of all thank you very much for the reply. Second, any idea💡what could be the issue with my pickup? It's a 2007 gmc sierra classic, with a 6.0 liter engine. Any help is much appreciated. Only the transmission is overheating
@@LuisHernandez-he53 do you know what transmission is in it?
@@TruckNerd I'm not sure but I'll look into it when I get home this evening and I'll get back with you. Hopefully you can help. Thanks a lot.
1200 cdn dollars. Taking mine to dealer
Prices vary
Excellent video...thank you
Your welcome.
Hoy many quarts of Mobil 1 Oil do i need for the process?
Oel Rincón you can now do this repair without removing the valve body. I use 7 quarts.
TruckNerd should i do a flush transmission before the process?
Oel Rincón when I am doing a flush I do it first, but you need more fluid if you do it that way.
TruckNerd than you! You got a new subscriber! You helped me a lot
Oel Rincón Thank you for your support.