Wells CounterPoint Ep. 26 - GM P0446 Vent System Performance-Diagnose & Fix it Right the First Time!
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- เผยแพร่เมื่อ 10 ก.ค. 2017
- This truck came to us for a second opinion on the check engine light, P0446. The first shop quoted a vent solenoid replacement, but the customer was skeptical. It had been replaced not too long ago. Join us as we show you how to properly diagnose and fix this P0446 code the first time!
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This is the kind of person that was smart enough to do anything he wanted in life but decided to become a mechanic, therefore a "best of the best" technician/instructor.
Wow Marco, thank you so much for the kind words!!!!
Mike Becker, Senior Instructor
You said it so right! I feel the same, I agree with you all way
EXCELLENT troubleshooting / diagnostic testing !!! Just can’t say enough about this brilliant young man who put all of his diagnoses in laymen’s terms so a not so smart guy like me could comprehend .... lol . Very good ! Thanks so much .... Jack
Very prepared, went smoothly, spoke clearly, and I learned something...Thanks Michael.
Excellent video!! Very clear and precise!! I found a reference to this channel from Eric O. at South Main Auto channel! You should give him a shoutout back!
In the system info, the number 12.XX mmHg, is a reference to millimeters of mercury!! Hg is the periodic table of elements symbol for Mercury!! When you measure Vacuum, as in a typical A/C system, it's measured in inches of mercury (in Hg). And a typical cross over measurement would be inches of water, in SAE numbers!!
I recently had to do this specific job (private, for a friend)! He was showing a evap performance code. He replaced the purge solenoid, at the behest of the O'youknowwho parts store!! PARTS CANNON ATTEMPT #1. That didn't work, so, he called me for a favor! I came, and immediately tested the vent valve!! It worked, but after two or three tries, it started to work only intermittently! And I showed him my findings!! That it was partially working, it needed to be replaced! The money light returned!! PARTS CANNON ATTEMPT #2. I used the code scanner at the parts house, and noticed that the tank pressure was absolutely following the purge attempts, and the pressure spikes, however, it was working but showed 6 in/Hg as atmospheric!! So, even tho it switched up and down as necessary, it wasn't calibrated correctly!! A quick pop of the fuel cap, proved my points!! But changing the sensor was a bit bad for me!! The truck had been used by the previous owner, to haul mulch!! For a while I'm guessing!! And the mulch ended up on top of the fuel pump area, AND SOLIDIFIED! Half a tank of fuel, no way to disconnect the plugs. Laying on the ground, with jack and stands!! Oh boy what a favor that turned into!! We spent hours chipping out the mess, just to get the tank out!! And then the clean up began!! What a job!! But the tank went back in clean, dry, and empty!! With a new sensor!!
Hey Roadkill5333 thanks for watching! I do shout out to Eric quite often in many videos! Thanks for joining us. Hope you subbed!
Crazy story with the truck! Sometimes favors end up that way...i've been there too! Try to do something nice and end up spending way more time than you wanted. Nice job getting through all of the issues though and getting it fixed right!
Mike Becker, Technical Services Instructor
This was very informative and easy to follow along. Thanks especially for showing the need not to have to drop the gas tank.
You sir deserve a medal of some sort.
This has by far been the most informative video I have watched in the past week. Hundreds.
Thank you sir.
Thanks Billy!! :)
Mike Becker, Senior Technical Services Instructor
Outstanding diagnosis, fix, and explanation. Thanks for the lesson!
Hey John, thanks! Glad you enjoyed the lesson :)
Mike Becker, Technical Services Instructor
Excellent case study. I really like your diagnostic approach. Thank you sonics for this class. Looking forward for next one. Cheers.
Thanks for watching Ramon!
Mike Becker, Technical Services Instructor
Thanks Mike, This is a refresher for me My next job is a P0446 on a 04 suburban flex fuel. Thanks!
Great video. It was very professional, informative yet simple. And i loved how you showed the struggle of installing the sensor. I thought you removed the connectors and sensor WAY easier than most. So you are human like the rest of us. Haha
Hey Channelboy9, thanks for watching! I am human, I bleed and swear like most techs out there ;)
Mike Becker, Senior Technical Instructor
Excellent video. You definitely have what it takes to be a great teacher. Great explanations 😊
09 Silverado, new ac delco purge valve, new Standard vent control valve, new Gm gas cap. Shop advised to change vent solenoid. Truck sometimes very hard to fill with gas then no problems filling. Vent canister is not plugged. Perplexed. Glad you posted this. I only have a bluedriver but I’m going to check the pressure readings. On live data the pressure fluctuates between -14 to positive while driving.
Awesome video! Wish I came upon this sooner...just a shadetree guy...but this is the first video that really explained why I've been chasing my tail so much with evap codes on my 08 Silverado. Thank you very much!
Hey Kevin, thanks for watching! Glad this video helped!
Mike Becker, Senior Technical Instructor
found you from South main Auto repair, Excellent info on the old gm evap system. Great Work Mike will be back and telling friends.
Great Orlando B, nice to have you here! Tell everyone! :)
Mike Becker, Technical Services Instructor
Excellent teacher. Well done on diagnosis! I have a p0446 on a 03 suburban. I’ll check the vent line and solenoid for clogs before having to drop the tank since top of suburban tank isn’t accessible unless tank is dropped. Tried a gas cap but of course that wasn’t the issue.
That sounds like a good plan!
Thanks for watching!
~Ryan
Just came back to say this fixed my check engine light with this code. Had I not seen this video I would have change the canister. It really is not easy but it's not impossible. I did it without a lift. Lowered the tank just enough to reach the sensor. Code clear and it's been six months
Hey, awesome! Glad you were able to get it all fixed up!
Mike Becker, Senior Technical Instructor
I'm back to say 2 years after replacing this sensor the whole pump went bad. Symptoms hard start, after 3 to 4 cranks it would start. New pump came with sensor included. So 2 years with new pump still running good
Thank you very much, and for the innovative way to diagnose faults. I am one of your biggest fans, and I have watched all the videos that you uploaded, and I hope that you will continue to upload more scientific videos, You really are a genius engineer
I wish you very good luck👍🏼
Degree in electrical engineering and a mechanic! Awesome job! My mechanic has come to the same diagnosis as you!
Awesome Deadbuck73, thanks for watching!
Mike Becker, Senior Technical Instructor
Hey, I'm here for a 05 Express 3500 with a PO449 but thought I'd watch anyway and am very happy I did. I am definitely going to subscribe since this was one of the best "classes" I've ever seen on TH-cam. Thank you very much.
Boy, do I wish I had one of those scan tools!
I need a better scan tool and need to brush up on my troubleshooting on wirer harnesses. My scan tool just kept reading P0446 vent control circuit. This taught me that not everything is as it seems. Kudos to you man, this video helped me fix my problem thank you.
Excellent video and that's after just coming off of finishing ScannerDanner Premium's full class lecture playlist course. You're definitely up there with the best of them. I really appreciate Wells supporting this channel like this.
Hey John! Thank you for the compliment! I really appreciate it. Thanks for watching our channel!
Mike Becker, Technical Services Instructor
Great diagnosis video. Thanks for taking time.
Thanks Mike!
Mike Becker, Senior Technical Instructor
Great Video, helped me fix my 03 Silverado, Thank you!
Hey Mike, Great!!! Glad I could help :)
Mike Becker, Senior Technical Instructor
As Lord Shaxx would say, this is amazing. Just solved my Chevy Silverado P0446 code that the Stealership said was the vent solenoid. Saved 1K+ 🤙
1000 plus 30 part easy in and out
Mike great work here. I came across your site channel today. Oh yes I have subscribed. I am 60 years old and am amazed at your level of talent and dedication.
Thanks John! Welcome to the channel! Feel free to look around and ask any questions you may have!
Mike Becker, Technical Services Instructor
One of the best how too videos I have ever seen.........
Great job Mike. Your excellent understanding of the system and critical thinking along the way sure help you make it look easy. But I was right there with you at every step. You just made a lifetime customer with that truck owner. BTW, love rockin' my wellstech "T" shirt. Thanks Mike and looking forward to your next class. It's Thursday the 13th correct?
Hey Mike! Glad you were able to follow along! I think I did as well. There is no way this customer is going back to that old shop! Good to hear about the shirt, glad you like it!! See you on Thursday for some Toyota EVAP!
Mike Becker, Technical Services Instructor
Thanks for sharing Good video
It's good to learn more about
Electric car problems
Very professional teaching. 🤗🤗
Hey Jesus, thanks for watching! Glad you enjoyed the video :)
Mike Becker, Senior Technical Instructor
I'm learning so much from you! Excellent Teaching!
Informative and professional...not annoying like other quirky videos out there.
Thanks for watching!
Ryan W, Technical Instructor
Safety when doing the reach around. Using the sharp edge condom tape was genius Mike! This video went down smoother than the delicious India Pale Ale I was drinking while watching. Great job once again, thumbs up.
We, as technicians don't get paid enough to bleed for a living! All about safety! I think anything would go smoother than an IPA...yuk! I prefer something nice and dark, like a nitro stout of some kind. That's one of the best parts about Wisconsin, we have, what seems like a million, small craft breweries making excellent beer! Thanks for watching Glen!
Mike Becker, Technical Services Instructor
Would plastic door edge trim do the job?
Excellent presentation!! Well Done! Thanks.
Thank you very much David!
Mike Becker, Senior Instructor
Excellent lesson. Thank you!,
Thank you for this nice and very well explained video ,bravo !
Thanks Raoul!!!
Mike Becker, Senior Technical Instructor
Extremely badass vid bro love ur style had my attention throughout the whole thing looking forward to doin this test on my 04' colorado..p0446 just popped up smh..
Hey, thanks man! Good luck with your testing. If you need any further help don't hesitate to reach out!
Mike Becker, Senior Technical Services Instructor
Evap system has been a mystery to me. But with it being the worst offender when it comes to setting up the MIL light I am glad to have come across you alls Chanel I am sponging up all of this info thanks , can't wait to catch up with the rest of them.subscribed!
Hey Jesse! I'm glad you've found us! EVAP is a huge offender in the check engine light work. Enjoy the videos, i'll be watching for more comments. Feel free to ask any questions. Welcome!
Mike Becker, Technical Services Instructor
Nicely explained and made look simple.
Brother, that is a very well done video my friend. I have an ‘12 GMC Sierra quad cab 5.3L with a tad over 167k & just like my motorcycle n’ things, I keep ‘em in great shape. Just yesterday I got this code, so since I don’t even have a basic diagnostic tool, I had Autozone at least pull up what the code was that caused the check engine light, that bein’ P0446 EVAP. I’ve yet gone to school for auto mechanics, but am an aircraft mechanic in the USCG & am able to hold my own bein’ mechanically inclined. Autozone’s results they printed up said that most ASE certified mechanics have typically replaced those fuel pressure sensors on GM vehicles. Gonna take it to Christian Automotive tomorrow here my state Lonestar state of TX n’ have them pinpoint the discrepancy with a better diagnostic system as you have. Again, thanks for the informative video brother!
God Bless,
Jason
Hey Jason, thanks a ton man! Glad you like the video! The list that Autozone gives you is just a list on possible causes. I wouldn't go throwing a pressure sensor in quite yet. A P0446 is most commonly caused by a purge solenoid. I would inspect that first. It's meant to be closed when not powered up. So, if you pull it off and can blow through it then it's failed.
Mike Becker, Senior Technical Instructor
Thanks for the heads up bubba. Yeah, done extensive forum research & the techs at my local shop here, honest folk, suggested mainly the vent selenoid & charcoal canister. I actually replaced the vent selenoid today. Noticed the filter for it that clips above fuel fill spout was very accumulated with dust/grime. I’m the 2nd owner now for 3yrs n’ original owner maintained this truck greatly, but drove a lot as a foreman, so probably been down many dusty roads. Had 144k when bought, now at 167k & undercarriage n’ all is emaculate. After installin’, done more research & found out about compressed air blowage to clean all out. Wished I noticed that before puttin’ a new one on haha. If this doesn’t do the trick, I’ll look into the purge unit. But like I said, most of that mileage is highway being just a 6yr old truck. No oil leaks, trans, just spotless. Only major thing I’ve done is replaced my outer tie rod ends last year since boots were all cracked up. This fault code is the only other dicepancy I’ve had thus far. Anyways, you & that South Main Auto guy are very informative gents n’ we all appreciate y’alls honesty. God Bless brother
Jason, sounds like you've got yourself a nice truck! Eric from South Main is a great guy! Thanks for watching man! Any questions just let me know.
Mike Becker, Senior Technical Instructor
Great video mike, that's a trick code,cheers and take care yourself
Nice concise clear explanation, ur videos are getting better all the time, anymore colorado videos would be great to see, especially a thermostat change, thanks
Thanks Mark! I may have another Colorado video or 2 up my sleeve. They always seem to be breaking haha!
Mike Becker, Technical Services Instructor
Very well explained and your camera work is excellent.
Hey thanks for watching Wyatt. I have been practicing :)
Mike Becker, Technical Services Instructor
Thank you for the video. I've been trying to figure out what sensor tells the computer there's s problem (pressure, vac, flow, ???). I've tested the EVAC systems individual components; they're working properly. I'll be testing that pressure sensor tonight. Troubleshooting and theory. Great video
Hey Shawn, thanks for watching! Good luck in your testing.
Mike Becker, Senior Technical Instructor
My 2003 Colorado the frame rotted out so bad it almost snapped in half . This truck is not too bad but is on its way to rusting in pieces. Good video it is helping me with my 2003 Aurora . At present it is constantly venting so I am assuming it is the vent valve . I was a auto mechanic for years .
another great video. crisp clean approach
Thanks for watching Luke!
Mike Becker, Technical Services Instructor
Excellent video!!! Thank you very much!!!
Hey John thanks for watching and commenting!
Mike Becker, Senior Technical Instructor
Very informative! Thanks!
3 years ago I cut a hatch in the bed over the fuel pump location . My tool box sits on top of it anyway. Now that I have to change this sensor what a dream to have the hatch just lift it up change the sensor and done in 15 minutes. The reason I put the hatch in in the first place was because my research told me fuel pumps and this sensors are problematic in 1998 Chevy's and I needed to change the fuel pump at the time and being that I dont have a lift and I'm too old and fat to crawl under and do this from below I figured cutting a hatch w a grinder would pay off some day and today is payday.
Hey Steve, thanks for watching! Sounds like a win for you!
Mike Becker, Senior Instructor
Excellent video. Thank you sir.
Thanks so much, informative video.
Hey Basshnter1, thanks for watching!
Mike Becker, Senior Technical Instructor
Great video man! thank you.
Hey Greg from Maine! Thanks for watching!
~Mike from Wisconsin :)
Awesome video my guy keep em coming
Excellent video!
Thanks Traffic Czar!
Mike Becker, Senior Technical Services Instructor
Great video Mike with the diagnosing as it just shows that you've got to understand a system if you're going to troubleshoot it. It's pretty obvious that the other shop didn't do any diagnosing and was making a call based on parts failure such as the vent valve. That sure did look like a bear reaching over that edge, but it's better than dropping the tank. Oh, how is the little fella doing and hope the rest of the family is doing well too? Take care Mike...Terry
Hey Terry, thanks! They loaded up that parts shotgun, and took a shot haha! Way better than dropping the tank! The little guys doing good, thanks! We are doing well too, finally getting caught up on sleep! He is sleeping through the night now :)
Have a good one Terry,
Mike Becker, Technical Services Instructor
Grasias amigo. Eres un profecional You are very intelligent
Man you just awesome 👍 thanks for the help.
Hey E Melloz, thanks!!!
Mike Becker, Senior Technical Instructor
They are very tuff to get back in!! I did mine 06 gmc! I:don’t feel like ever doing another!!! 💙✝️
Hey Charles, yeh it's not the most fun job in the world ;)
Mike Becker, Senior Instructor
keep up the good videos man!
Hey Petar! Thanks for watching! You keep watching them, i'll keep making them!
Mike Becker, Technical Services Instructor
Very informative video ...thank you
Thanks for watching and commenting Joseph!
Mike Becker, Technical Services Instructor
great class as always
Hey Jose, thanks!!
Mike Becker, Senior Instructor
Great job, nice scan tool to have. Mine started small leak for a few years now Gross leak. GM seems to have different charcoal vapor canisters.Mine has 3 ports. Sites show charcoal gets into the lines. My first thing is to smoke test.
2004 Suburban. Ohm, continuity test purge valve19.4 all good. Will check with 12 volts. You’re too far for my drive. I’m old school, amazing Technology, you explain it well. 👍
Hey Alex,
Good luck on your diagnosis!
Thanks for watching!
~Ryan
Great video, thanks.
Awesome video. Thank you.
Thank you very much Jeana!
Mike Becker, Senior Instructor
Very good video my friend thanks
Thank you very much Kenry!
Mike Becker, Senior Instructor
Awesome video real professional.
Thank you very much! Appreciate the comment!
Mike Becker, Senior Instructor
Thanks for the video. Super job ! I’ve noticed most of the diag videos I’ve seen always include a wiring diagram that you guys just “pull up” . Is there a website or is it one of those $2000 a year subscription things. I’ve always had to go get a vehicle specific manual for whatever I was working on. I don’t do it for a living but I help a lot of people in my community and at work. Keep up the good instructional videos as I am learning a lot. Thanks!
Hey Tommy, thanks for watching! The website that most of us use are all "pay to play" such as Alldata, Mitchell, or Identifix. Yes, they are costly, but when you do this for a living they become a necessity.
Mike Becker, Senior Technical Instructor
BBB Industries has free diagrams, probably what you need
the classic reach around
Eric O terminology
Haha thanks for watching Richard! I find myself using Eric O's terminology quite often. Some of it is just so darn catchy. I can't pick up a can of brake clean anymore without dramatic music playing in my head!
Mike Becker, Technical Services Instructor
Again outstanding work so smart maybe now I can fix my chevy aveo code po446
Hey Sandra, thanks for watching! Good luck on your Aveo!
Mike Becker, Senior Instructor
Great video and tips
Thanks for watching!
Great video lecture!! I have the same issue on my 2001 isuzu rodeo 3.2 v6 2wd. They replaced the vapor canister and the purge solenoid next to it they performed a smoke test. Also, the purge solenoid in front of the engine plus the 2 vaccum hoses in front of the engine as well. In addition a new fuel pump. But still that pesky check engine light still comes on P0446!!! do you think its the same issue fuel tank pressure sensor? please help? thanks
Appreciate the video , explained every part and why very well.
What is the diagnostic tool you used to read all the information on the vehicle ?
Thanks again , you do an awesome job !
Thank you for shining some light. Swapped the actual evap valve. $35 oem part and $100 for mobile tech to drop tank. Code didn't clear.
Also asked him to swap fuel pump's float sensor since I run out of gas when gauge says I still have 1/8.
So now replace FTP and float lever.
(2005 Chevrolet Uplander)
Might want to grab a cheap endoscopic camera so you can watch where you're going with both hands free.
Great video and advice. Thank You
Awesome video
Thanks Bryson!!!!
~Mike
Thanks now if I can explain it to my mechanic he can fix my truck. Randy Bang
That's great Randy! Always good to have some idea of what's going on when you walk into the shop!
Mike Becker, Senior Technical Instructor
Excellent!!!
Thanks Ernesto!
Mike Becker, Senior Instructor
Awesome, thanks.
Very thorough, Mike you're wizard...just curious once you saw the connectors and determined clip style other than needing a free hand, when you placed flashlight did you realize you pointed it at an area that you were blindly disconnecting by touch only. Actually had a StarWars feel to me, let the force guide you luke..oops Mike. Diag guru. You're awesome 💪👀💪
👍 WELL DONE
Thanks Sm Ms!
Mike Becker, Senior Technical Instructor
on a 2000 impala, charcoal filter is good- the vent clicks and opens. But still fills slow. Maybe pressure silinoid on engine??? OR maybe something on fill hose ( doubt that,) seems like if fill before drive far---will fill with gas pretty well.
in the 07 chevy express 3500 s gm supposedly added a mouse hole so you can access the FTPressure sensor thru a hole in the side of center storage drop down compartment .
Well done, what a professional video! When you jump the 5V ref to the signal wire, would it ever be wise to add in a resistor, maybe 5k ohms, in line with the fuse so that any current through that wire would be negligible?
Hey Spelunkerd, thank you!!! Being that this is a PCM driven 5v circuit there already is a resistance built in, inside of the PCM. It will/(should) current limit itself. If you are ever hooking directly to the battery you will want to be much more careful. That magic smoke is hard to get back into the PCM once it's escaped :)
Mike Becker, Technical Services Instructor
Great diag/training video. I appreciate the thorough explanations.
Good stuff
Hey Tony,
Glad you enjoyed it!
Thanks for watching!
Ryan Wilsing
Had this code (P0446) on my 2004 Silverado. Turned out to be the fuel pressure sensor. I should have watched this video first. I changed the EVAP Vent solenoid. Check engine light didn't budge. I then changed the purge valve in the top of the engine. Check engine light still on.
I had to unbolt the truck bed and lift it partially to get to the fuel pressure sensor. But that did the trick. It's been a few weeks and the check engine light has stayed off. And I was able to pass smog. Hopefully it doesn't come back on.
good one mike.
Thank ya, thank ya!
Mike Becker, Technical Services Instructor
Is it a good idea to replace the whole fuel pump assembly as a preventative maintenance since, the pressure sensor comes with it? I do have a running pump that's at least 10 years old but I dont know if I just do the whole assembly or just the sensor for P0446 code?
Well, I tested my MAP and Fuel Pump connections at the harness and I had voltage being fed to both with key on. 4.9v on the MAP & 14v+ on the Fuel Pump plug. (Grand Prix, 3.8L) My code was cleared and hasn’t returned in several days but it returns sometimes. Could be my Vent Solenoid. Maybe.
Hey, thanks for watching! The vent solenoid was a pretty common issue on those GP's.
Mike Becker, Senior Instructor
@@GoTechTraining Hey Mike, do you think that could be it based upon my test above?
good job
Thanks Ray!
Mike Becker, Senior Technical Instructor
What a great video, and also an amazing tool ya got there. Where would someone find something like that ? You know me I love fast scanners
New Level Auto launch x431 pad
Hey Keith! Thanks! It is a great tool! I really enjoy using it so far. I looked into on a recommendation...and I'm very happy with it. It is the Launch X431 Pad II. Check out Launch USA's website for more info on it!
Mike Becker, Technical Services Instructor
Hey Swav100, yep that's right!
Mike Becker, Technical Services Instructor
I have an 05 silverado 2500hd 6.0. And started getting the same code. So hopefully it's just the sensor or it could be the evap canister.
Well Done Video!!Question: Can I replace the Fuel Tank Pressure Sensor on a 2007 Avalanche without removing the Gas Tank as well?Or should I remove the Tank? Also, would it have been better to connect the wire before installing the new sensor ?
Hey, thanks for watching! By the book, you're supposed to remove the fuel tank. You may be able to sneak your arm up in there though and get to it. I prefer to not have the connector plugged in. I don't want it getting in the way when i'm trying to install the sensor.
Mike Becker, Senior Technical Instructor
Mike, you said you used a fused jumper wire from the 5 volt ref to the signal wire, what amp fuse did you use?????
Hey Mike, I trying to replace the fuel tank pressure sensor on my 2010 GMC Sierra. Any tips? I’m having a hard time getting either connector off and I am not able to pull the sensor out. It’s a pretty tight space.
I'm confuse @ 18:15! Did you take a jumper wire and connected the 5v ref to fuel tank pressure on the pcm and then you jumped the signal and ground on the connector? If you did I just learned something new, thank you much but will not do it with a 12v, like you said. Also to make sure my pcm is ok can I just back probe the my signal + and - @ the connector then use a multimeter to determine my voltage? If I'm wrong please correct my ignorance? Thank you much
Absolutely loved the video. Very clear instructions.
I have a 2008 siverado with the same issue and code. Dealership couldn't find it but said the purge valve and solenoid were fine, so its gotta be the pressure sensor right.
The video showed that it's possible to test and change it without dropping the tank, although not easily.
Is that possible with a 2008? Seemed like a different body in the video
Hey Michael, thanks man!!! Glad you enjoyed the vid. "gotta be" always scares me. There's testing that should be done before I say its a sensor failure. The process of part elimination usually ends up getting expensive. According to the vehicles service info the truck would need the gas tank dropped for this job....but it also said it for this truck as well :)
Mike Becker, Senior Technical Instructor
Very comprehensive! They say a good teacher makes a complicated subject seem simple. And u did just that!! Two questions. Can u in the settings of that scan tool make it report in English instead of metric? And two. Does Wells carry the pressure sensor? Three (sorry). Is Wells on the West Coast and what do u guys have? Thanx again!!
Thanks Bill! That is always my goal. I want to teach in a way that everyone can understand. I practice with my wife, who doesn't know or care much about cars. She's a good sport. If she can get my drift I know i'm on track! There are setting adjustments, and it is in English...for whatever reason these PIDs were not changeable on this one. Something in the software....Yes we carry this sensor. SU1390 is our part number. You can pick this up at your local Autozone. We sell many of our products under the Duralast vehicle electronics name. You can always ask them to verify it is one of ours! Thanks for watching Bill!
Mike Becker, Technical Services Instructor
I have a VUE that has the po446 right now. Sensor constantly reads 4.2v or higher and shows -13.25 h2o at all times. We pulled the tank and ran the tests and everything looked good. Replaced the sensor and right back to stuck at 4.2v. Figured we got a bad sensor, so we ordered an AC Delco. Still showing over 4 volts. I'm a bit confused on this one.
If everything is correct and wiring is OK and the light still stays on,do you think that re-flashing the PCM to stock would eliminate light?
Hey Jim, I suppose it's possible....I would be willing to bet that everything is not correct though. Maybe you are chasing an intermittent problem?
Mike Becker, Senior Technical Instructor
excellent presentation. So the pressure sensor was bad?
Hey Jeff, thanks for watching! Yes the fuel tank pressure sensor was faulty on this truck.
Mike Becker, Senior Instructor
I have this check engine code. If I replace this sensor will it also help when I pump gas. Right now my truck is very hard to put gas in keeps clicking off I have to hold the nozzle up in the air to fuel up.
Hey Terrence, no, this sensor will not have an affect on pumping gas. Chances are, you have a restriction causing the nozzle to click off. Maybe a stuck closed vent solenoid or vent filter.
Mike Becker, Senior Instructor
Your trouble fueling at the gas pump is your charcoal canister