Chevy / GMC - P0446 EVAP System Vent Performance Problem
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- เผยแพร่เมื่อ 16 ต.ค. 2024
- Let's have a look at this 2004 Chevy Truck that was dropped off at SMA from another shop that was having trouble diagnosing the classic P0446 "EVAP Vent Performance." Honestly folks the GM Purge / Vent type systems are the easiest systems to diagnose. Take the time to look at the videos below put out by Mike Becker from Wells Vehicle Electronics and educate yourself on these before throwing parts at it. Some of the best vids on the web IMO. -Enjoy!
Wells EVAP Training Videos: • Learn ALL About EVAP S...
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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair
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Hey Eric, thanks for the shout out man!!! Great video as always!!! ~Mike
Wells Vehicle Electronics no problem Mike I just think you have the best evap videos hands down!
me too or two
Between you and I we have the EVAP market cornered here on TH-cam :)
WVE!
@@GoTechTraining I'd agree!
I commented on your other EVAP vid - P0455. I chased that money light rabbit to no avail. Saw this vid and decided to check the fuel tank pressure sensor. I could check & verify voltage but that was it. Replacing the vapor vent solenoid and purge valve didn’t correct the fault so I ended up at the fuel tank pressure sensor. I did not raise the bed or drop the tank. Sure as heck the sensor tip broke off. Got the soft sensor seal out and was able to wiggle the new sensor in. Did the specific GM “drive cycle” a couple of times and the permanent P0455 was gone. Much appreciated!!
My 3500 Chevy Express was throwing this code. Changed out the evap sensor after watching this video. Fixed it in my driveway for $45. Toughest part was having the patience to lower the tank in order to get to it. Thanks for the info and doing such great vids.
Don't feel bad about EVAP videos every now and then Dr. O. You see them a lot but most of us rarely see them so it's a huge help to watch you diagnose them. OTC better get their poop together and make their scan tools more responsive. No excuse for that crap. Thanks Dr. O!
Great video, very easy to understand. Got to give GM a little credit for not over complicating things. I like simple!
Your video says 4 years old but new to me.
I just came upon a 2003 Chevy S10 that I put an engine in and I had an EVAP code P0446 that was driving me crazy. I loaded up the parts cannon (2 shots) 1 for the vent valve and 1 for the switch on the intake, still P0446. Stumbled upon your video (If anyone knows what the problem is it's Eric O.) and decided to give the tank pressure sensor a go. (Yes the little rubber thing snapped off and yes it came out with a drywall screw). So far, so good. Just trying to get through inspection.
Eric, you are so technical in your approach and knowledgeable especially when you indicated that the system will check on leaks after the facts and this genius," lucky you perfect businessman".
Thanks again for a great video on how to actually diagnose a problem, verify it using data THEN change out components. Great editing and thanks for showing the relevancy and application of wiring diagrams. ATTABOY SIR!!
Great diagnosis.... Good stuff... Your camera work and editing make your videos great to watch.... Best repair videos on TH-cam!!!
i always enjoy how you explain how the system works, what is wrong, why it is wrong and the repair itself. the confirming of the repair is always a valuable touch to the end of the video so that we can see what is normal and correct. thanks again eric !
How many times have I heard, "this was bad, that was bad, and another thing was bad...". People using the parts cannon. Good video, and a nice guy too.
B crinshaw all-too-common...
Very glad you made the video with taking the time to show the wiring diagrams and how you use them. That makes it very helpful. Thank you Dr.O
Man you uploaded this on a Sunday before 6 am. This the only day I get for extra sleep, you are the man Eric O. Thanks for all you do for the d.I.yer.
Another outstanding SMA video production! Really clear power, ground, signal test procedure at 14:22. Also, nice testing procedure on the basics of pressure testing the system using both vent and purge solenoids. Double thumbs up!
Sandbag1300 thanks man!
Hello Eric and the O clan, I'm in Las Vegas and I have a fairly wealthy customer who attempted to change the plugs on his Ford 3v truck, guess what, 6 of the 8 broke using the factory Ford protocol info. They now need to be changed again because of an injector problem that fouled them. I had him watch the Timmy video and his idea was we take it to him and we record the video to avoid editing, being that he's pretty well off he will be footing the bill. I appreciate all that You, Ivan, Keith, Paul, Bruce, Nestor and all of our real automotive Dr.s do for our trade. It's a shame that King Dirtbag Timmy is doing exactly what he's accusing others of by giving true, honest, knowledgeable Diagnosticians the dirtbag stereotype by his example. I don't think You, Keith, Ivan, Paul or any of us are talented enough to repair the no comm failure between Timmys brain and his mouth. Much respect to the true Aces of our community......
Haha yeah timmy is a tool. I would pay to watch that monkey try some 3v Ford plugs. I'll race him, him and his wd40 and me and an impact. I can snap the back two off and still have the job done while he is spraying his wd and waiting.
Who's Timmy?
You and 1A Auto parts are my two favorite mechanics videos to watch on youtube!
Hi Eric what no Mrs O in this Vid? one of the reasons i like watching your channel is the helpful everyday tips you provide. In this one breaking the plastic nipple on removing the sensor. not only did you show the way you resolved the issue you explain why a drywall screw works better than a sheet metal screw in plastic. Keep the quality Videos coming.
Ah don't ya just love it when ya get gravy work from other shops !!!
I have a 2004 Chevy Silverado 1500 4x4 4.3 liter v6 5 speed , the original battery lasted 10 years to the day it only has 89,000 miles now best truck I have ever owned , not a spec of rust on it , I factory ordered it and it had three miles on it when I took delivery .
Thanks for the video and explanation. I have a 2004 GMC that had the same code. After debating whether to spend the money on a scan tool or have someone else fix it I went with ordering the tool and doing it myself. I figured if I took it somewhere depending on how they went about things it may end up costing more in the long run than buying the tool and I will eventually find a use for it with my other car (I've been lucky for way too long). I do have a mechanical background so it's not like it was my first time wrenching... just my first time working on an EVAP system. Thanks again
Thanks 4 sharing the Wells EVAP Channel link yo. Yup, best thing that happened to me today, no more evap mysteries to solve
Thanks for bringing us along, Eric. I have an ac delco battery in my 03 silverado that I installed in 2010 and its still working good.
Eric O , casual information like the battery age van be interesting, like who notices things like that? A family member has a gm car , 1997 firebird, 25 thou, and battery was replaced in 2016. Three sets of tires from dry rot but the battery keeping on keeping on. 17 or 18 years must be a record.
Like the Vantage Pro. Wiring diagrams and instructions on how to test. And your explanation was great.
Save me a lot of money!
Check engine light was on; Code p0446. All I did was hit my VSV with a screw driver and got the valve to kick in or out! Thank you very much. (1997 Toyota camry v6)
Great tips! Mine broke off and I used the screw tip. Worked great! Thanks!
Mike does a great job over at Wells. This was a video packed with information. Very well done Eric.
Thanks Wyatt :) ~Mike
Great description - You couldn't pay for better instruction than this!
I learned a lot from you you are very very good mechanic please keep your videos common you help out a lot of people because when you bring it to Chevrolet their outrageous with their prices so thank you for that
Sunday morning with Eric , very good info
Good morning Eric. Another great video and easy money on the Gm evap system.
I see why some guys just put the parts in. It takes a lot of money in scan tools to replace the simplest things. Great video.
If you visit an O'Reilly auto parts, autozone etc most of them will loan you their scanner tool for free
I second what you say about using only genuine/OEM sensors. It also applies to the former GM European brands (Vauxhall/Opel).
Congrats on 105,000 subscribers...I have been watching you forever! 4 years maybe ? Wow very cool.
The worst part about replacing a GM truck EVAP sensor is all the updates that they have done over the years. Sometimes the replacement parts come with the plastic tubes, some come with new style sensors, etc. Always seems to be some modification necessary.
Just got back from a vacation, get to enjoy a new SMA vid!
We're in the living room having coffee and i made a crude joke, I'll tell you later, and Olivia and Carol gave me a dirty look, but you were laughing in the video, perfect timing. For sure and for certain!
Hey eric i noticed when your using the OTC u have those applications open in the background close them out and always use one program at a time.. 2 at max.. Backround applications are still running even though your not actually on it using it.. Its taking up your ram on device.. Hope this helps with all your scan tools.. Always close out when your done ull see a huge difference
Thats why its responds the way it does..
Great tip using the wood screw trick for extracting the broken plastic piece!
Long time watcher first time commenter. I have a small cab co in balto. We use impala,s I do my own repairs .videos are great.
great video , thanks . I have his exact problem. diagnosed by crazy voltages at the sensor. . note in 07 + models of chevy express 3500 s GM put a mouse hole at the side of the center pull out storage compartment so you can grab the F T Pressure sensor to test and replace WITHOUT a tank drop if you are lucky .
If a shop can't diagnose a GM evap system, it needs to close down.
Seriously!
Thank you for this video I bought a new fuel pump but the sensor wasn't compatible so now it's fix I have the right sensor I love university of TH-cam 🙏🏾
Eric, thanks for the great video u share. always pleasure and enjoing watching learning what ever u show. cheeeeeers
These scanner tablet tools you have probably cost a LOT of money. Why do they always use ancient, cheap, and SLOOOOOW tablets when they produce them?? Awesome video!!
Thank you for the info!!! Helped me a lot. And I only have a $400 scanner. Looked up the OTC evolve on Amazon and it was $4300. 😅😂 More than the value of the truck I'm working on. Instead of dropping the fuel tank. I unbolted one side of the bed and used a bottle. Sat it on the tire and used blocks in the fender well. Gave me enough room to get my volt meter connected to the fuel pressure sensor. Again, thank you!!!
i was waiting for the a/c compressor to kick on when you said everyone be quiet!
A lot of great EVAP tips. Awesome diagnoses Eric. Thank you. Cheers
Maybe the other shop has dirt cheap labor rates. I think most peoples loyalties are going to be with whomever can consistently save them the most money on their repairs. This time it would have been you! No parts cannon req'd. Have to agree with you Eric. Mike Becker at Wellsve has great vids and is a great instructor. It's always good to see you there for his online live classes. I'm learning a buttload from you guys. Insert pun here...........lol
you may have just solved my problem... i keep getting a PO446, vent valve and purge valve are both working properly, i would've never thought about a tank pressure sensor (and my scan tool doesn't give me that data) but i guess ill be changing it when i fix the sending unit. 👍🏼
I'm in the same boat
@@iamnotafraid I went over to the Chevrolet dealer where my dad works to hook up their diagnostic tool to it to confirm, sure enough, pressure sensor was bad.
Just down the road from me in Fondy...Always have good luck with their products. Auto or Marine...
Excellent video, Eric. Nice touch with the wood screw. Ha !
I lift the bed, 4 bolts, one wire harness and the fuel intake hose. Got a lots of room to work on the fuel tank. quick and easy.
and I thought I was bad having a 2006 battery in 2016, it sat unhooked stored/maintained quite a few years and I nursed it along some, not realizing it was so bad.
yeah too lazy to check, thought it was added electronics draining it, until it didn't start last winter :))
nice video my wifes 2004 canyon same problem 50.000 miles .too much sitting 19 yrs old truck .glad i watched didnt know the sensor was just a push in preasure fit. . i have a 30 dollar code reader ... 0446 .have to go on line to see what codes mean .. ha .
These are videos I like. Great explanation and detail. Also, like how explain what readings are suppose to be what. Thanks for sharing.
Found it like a hound dog, awesome work Mr O !
If you have a problem. If nobody else can help. If you can find him. Maybe you can hire - the O Team.
Just what I need on a cold day a south main auto video 👍 live in West Midlands uk and woke up to 10inches of snow ⛄️
Yes me too, i broke out the wellies to go to the shop, a polar bear attacked me lol :-D
At least you woke up; that makes it a good day. Stay warm.
Awesome video Eric! Keep up the great work!
Eric O to the rescue.
I always use my vantage pro and vantage ultra for info. Absolutely love it
I did the pressure sensor on my 2005 Silverado 2500HD by Braille on the pavement in my driveway laying on my back and reaching up between the frame rail and the bed floor. The long forked trim rivet pry tools for the Christmas-tree trim plugs will pull the sensor. Thankfully mine didn't break off. Not fun but doable. I put Sil-Glyde on the nitrile gasket.
The GM PCM eventually checks the circuit resistance through the pressure sensor and it will set a code if the circuit is open or shorted... IIRC it's P0451 but don't quote me on that.
0.22v must be a common sensor failure voltage.
If your in the market for a new mechanic, replace your windshield wiper fuse with a blown fuse and take it into the shop you wanna try. And watch what happens.
What should I be looking for
@@Mary_Marii literally them quoting you for anything else is a pretty good sign it’s not a trustable shop
@@all3n1k dam I have to find a new one thanks
@@Mary_Marii honesty
Honestly not a bad idea but most shops with look over the whole car check your suspension and brakes too and try to upsell work.
Putting a bad fuse in could be several things. Was the wipers frozen or covered in snow causing high resistance in the motor and now they are freed up.
Maybe they will only replace the fuse and not test the circuit . That would be my red flag or they then tell you it’s the wiper motor.
Likely the other shop didn't have the same functionality in their scan tool, you with your tool made the diagnosis obvious.
any auto shop now days sould have at least one scan tool with bi directional capabilities and even if they did not most scantools will show ft pressure and when he removed the gas cap while watching to data and the pressure did not change it was obvious the data was lying which should have led them right to the pressure sensor for some checks. this system is simple and a shop def should have no excuse to mess this one up. not to mention they threw a vent solenoid and purge solenoid at it with the parts cannon. i would not want my vehicle at that shop. u may disagree and thats ok but i dont se any reason why a shop should have missed this one.
Yeah, a $40 generic OBD-II scanner would have really been enough to figure out that the FTP sensor was bad here. The bidirectional control wasn't really essential for the diagnosis. Though I have to wonder what kind of shop doesn't have a scan tool with bidirectional control on a common vehicle like this..
Thanx for all the vids this weekend
Eric, You should try closing some of those open apps on the OTC when it gets really sluggish like that. When they are just sitting around in memory that puts pressure on the system which I'm sure is limited to begin with. Just my two cents.. Great video!
Excellent Troubleshooting Diagnosis Eric 😎👍🏼
Great EVAP vid - thanks Eric!
Not sure for new cars or other than gm, but all the gm three wire sensors ive worked on, signal has always been the middle wire. And ground was usually a black wire or black with white stripe.
You are correct but when I am jumping wires I always double check :D
South Main Auto Repair yep, first thing I grab is a wiring schematic, makes things simpler when you know where the angry pixies are supposed to go.
Another thing you can do is use the ecm itself as a quick and dirty volt meter. Jumper your signal lead at the connector between the ground wire and 5v reference. Then just watch your obd2 scanner and watch the voltage. Should read 5v between reference and signal, and 0 between signal and ground.
Annnddd...I just saw you did the exact thing here... Oops...😚😳
Haha good tip ;)
South Main Auto Repair thanks, Eric. I was a dealer driveability tech for twenty years, diagnostics was my life. Friends bring cars for me to work on. Me? I drive a restored 1993 Oldsmobile cutlass supreme with a 3.1 v6 multi port. I hopped it up a little, those w bodies with that engine combo were the best gm ever made.
Always learning on SMA. Thanks.
Love your videos!
Im gonna check out that link for wells as i know nothing about evap codes as we dont get them over here in the uk...
Mike does a great job on the subject!
subscribed to his channel
A lot of good stuff on there.
Watched his evap vids...i now have a better understanding of the purge n vent valve operation...its all pretty straight forward realy.
I would lift up the bed before dropping the tank. Did that on a Ford Ranger to repair a rusted brake line.
Upallnight ive done that too, even to do fuel pumps. Only problem is in new York where Eric is, tank straps and lines and bed mount bolts will be equally rusted, so its a toss up of two evils.
Great video. Really good diagnostic process
Great video Mr owe .as usual enjoyed every minute of it
Mike is very good as u are
On my Silverado I'm thinking about making a open and closing hatch for the fuel pump and stuff
Good idea. I see alot of people did it on TH-cam.
Good video, nice explanation of the testing and re-ck.
Thanks for all you do ! It means a lot.
Nice job as always
Damm, talk about having a bad "scanner tool" day @ SMA!!
LOL 😂 😁 😆,
But as always great video bro!! 👍 👌 👊
Hi Eric Great video!!! I am chasing a evap tank pressure code > my mechanic Bud said he would read the codes and system for 40.00.
He said I was right the tank pressure sensor was the problem was 0 volts reading...so is that lack of voltage from PCM or broken wire or bad Tank pressure switch... Where does the tank sensor get it's 5 volts from so i can trace it. I know the evpa canister gets a ground feed for PC1 pin 17 2005 envoy . Is the power source from the PCM I need a diagram'
I think Eric O's new admirer that Bruce Allen was talking about is the one who keeps disliking the videos.
bash5995 At least he's watching and learning something.
hello very awesome video, i have a chevy lumina 2001 i try doing this test and my scaner says vaccum to strong and it wont let me do anything also my gas tank pressure tank sensor reads -30 any tips
slow scanning tool...
a minute is like an hour waiting on these!
Thanks for the video!! Just saved me from shotgunning some solenoids lolol
Hey Eric. Love your channel. I am having a ton of trouble w my OTC. It has had the newest and quite expensive updates, but has communication problems, and sometimes just locks up 'thinking'.. What alternative tool would you recommend? I'm at wits end! Thx!
I really like my Autel MS908
I'll look into that. I'm really frustrated w OTC right about now, and have spent a ton of$ on this stupid thing. Thx for the response. !
GREAT vid man! This is exactly what I needed. I'll be checking out the Wells vids, for sure.
I've said it a miilion times, but I'm clueless when it comes to EVAP ... probably because I consider it a completely USELESS system. If I didn't live in the Northeast, it would be a non-issue ... but since my commie state runs gestapo emission inspections, it's very much a big deal here. Here I go ranting again ...
My line of thinking is, if it doesn't affect how the engine performs (I.E., gets you to work to pay the bills), then it's a non-issue. State MAKES it in issue, and that makes me mad ... but I digress!
Since I'm stuck in this commie hellhole, I need to learn how they work. :) When compared to NJ, I guess MA ain't half bad - get this logic: They completely eliminated their SAFETY inspections ... but kept emissions! So, you can go careening down the highway at 85MPH with bald tires, shooting sparks from bare steel belts, blown ball joints, tie rod ends, and no brakes ... but that's all good, as long as your not "polluting". Liberal logic. GRRR. Sorry - RANT OFF!!
Smitty Smithsonite I'm in NYC and was a State Inspector for a number of years. I was always amazed that a car that could potentially crash and kill a dozen people within 1/4 mile of driving after you passed it for inspection was legal to do. Amazing backwards system here in N.Y.
Eric O: Let's see if we hear a whoosh. President Business: Hilarious. That never gets old. -- Yes, President Business, Lego Movie jokes never get old!
Haha the ONE guy that got the joke! Haha everything is awesome when your part of the team!
I know you are singing it now haha (sorry)
Nothing to worry about. That song, The Lego Batman song, and The Guardians of the Galaxy soundtrack is played at our place every morning as we're getting ready to the day.
Hello Eric O., I noticed the scanner you were using, and hadn't seen that brand before. How does it compare to the Autel scanners for example? Great video as always.
Excellent video great job
I just replaced the purge valve, filler neck, and gas cap on my old 03 s10 and the 446 still came back! The neck needed replaced anyway because it was hard to fill. I guess I'm going to a shop now because i really don't want to mess with the canister or tank sensor!
Great video my friend.I have question i been in automotive industry now almost 2 years and i learned so much when it comes to diagnostic work i slowly bought lot of tool recently bought nice Matco box with hitch even though place i work we have shops diagnostic scanner and it is 4 of us sometimes you have to wait for your turn now my question is Which What kind of diagnostic scanner would you recommend the choice is endless and i want to pick right tool first test around because they are not cheep if you can recommend something i would appreciate by the way great channel im from central ny also.
Hay fella ..... Which is best the OTC or the Autel .... Like the Way you multitask on the OTC ..... Thinking about buying the ms906 bt . What would you recommend .
Would fuel pressure sensor cause the truck to idle really rough? Got the same code but canisters been replaced and wiring looks fine. Keeps saying evaporate harness
omg you didnt break spark plugs or replace all the injectors???? lmao nice informative video. quite amazing how sensitive those sensors are that you can close the system and see the change that fast.
Chevys are the BEST BEAST TO HAVE
Hey Eric, do you still have any of your snapon scan tools. Like a solus ultra or even the solus edge? Or did you trade them in towards your newer snap on scan tool. Just curious.
I misfired the parts canon with a BWD fuel pressure sensor. Had to re - replace after 90 days.
BWD Broken When Delivered.
Nasty and hard to reach electrical always gets the OEM parts. Not worth the frustration of doing it twice.