EVAP Vent Solenoid Code - P0446
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- Опубліковано 23 жов 2016
- Let's have a look at this Chevrolet Cobalt that came with a code P0446 for the EVAP Vent Solenoid Performance. I have notice that most people will get sucked into the trap of changing parts based on code definition instead of code setting criteria. Let's have a look at this car and see how the code could send you down the wrong path if you don't look at the EVAP system as a whole to make a fast diagnosis.
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--Eric O.
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Disclaimer:
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. - Авто та транспорт
Hi everyone!
I’m mechanic my self, working in this field for many years, 20 years
I definitely support this guy. He knows his shit very well.
Watch the way he explained things .He doesn’t just change parts, he actually troubleshoot the problem first and most importantly he explained everything in detail so well .
Good work buddy.
Just wanted to say thanks. Ive been chasing a p0446 code on a aveo for awhile. Swapped out both the vent and pressure solenoids and still had it. Went over every line and seal on that fuel system and couldn't find a leak. After watching your video i checked the data and it showed the car thought it had 16" of vacuum in the tank. Pulled the sensor and checked output voltage and sure enough it was stuck at 5 volts open air or pressured up. Cheapest part i have ever bought for that car. Thanks for the informative video.
i'm going through the exact same problem on my aveo right now. i've been chasing codes left and right trying to figure out exactly what the problem is, and p0446 has been there for a WHILE. finally caved and went to a mechanic after watching this video and what do you know, that's the problem. i'm waiting for the shipment and it was very easily one of the most cheap parts i've spent on this forsaken car. i thought it was just me with the aveo problems.
The fact that you're such a conscientious person that tells it straight is a great thing to see. I'll never get tired of that. Honesty is something that kind of slips by the wayside in some shops. Thanks for the video.
Excellent Job! Your understanding on how the system operates is what lots of mechanics lack. I use to work with at a Chevy dealership with about 10 mechanics and my observation was that only about 2 -3 out of them were were really good at diagnosing the less common problems that needed to be dug into further. Some were only good at R&R.
Hey Eric, just had to come back to this video after a few weeks to thank you for making this. I've been very slowly attempting to fix my p0446 on my Chevy Malibu. I tried all the obvious -- the fuel cap, easy to reach sensors, etc.. As you know with the NYS inspections, gotta get that money light off by any means possible, so I gave up and brought it to a mechanic who ALSO couldn't figure it out...... And it ended up being the fuel tank pressure sensor. Thanks again for making an in depth video on this, I can finally stop getting parking tickets for having an expired inspection 🎉
What were the symptoms of your car? Would it shake and stall?
@@NIGHT-tj7ksgreat question. I’m perplexed. I replaced the vent solenoid on my 07 Colorado because it was cracked. That’s took away my check engine light for a while. Now it comes and goes but still persistent, p0446. Is it possible that the canister is clogged or still leaning towards tank pressure sensor
This helped out a ton! This was the only video I could find that actually had the same issue as my Cobalt SS. My code was actually P0455, but it indicated that my Fuel Tank Pressure Sensor was bad, which it was true. Thank you so much!
Eric, Hope you and your family had a great vacation! Glad to have you back.
The Ford trucks we had used a similar system. Once I learned the relationship of the fuel tank pressure sensor, the vent valve, the purge valve and other components, it became easier to diagnose Evap problems. Then came the 2009 Dodge Avengers, with no shop, Internet, or documentation support. Luckily I only saw two of those!
Great Video!
That's a great point about looking at the fuel tank pressure solenoid first. Your commentary is spot on, it all made sense and the test was simple. Thanks again Eric.
Thanks Wyatt!
The most useful tool in your arsenal- can't be purchased, and will never fit in a box= *Experience.*
I thought you were gonna say oneself.
I don't know man, i can make people people fit in really small boxes, mob boss style! Ya know?!
*Two-post lift
Test no guess! Great video! I needed to change that sensor for my truck and it drives better and I can pass an emissions test in my state. Thanks again!
oldie but goodie. bought a fl. 05 c1500 with the money light on and tighten gas cap message. and the classic po455 code. trying to figure where to start without a high dollar scan tool. your vids are helping. stand by.
this video is a few months old I watched it when you first uploaded it and had a p0455 evap large leak detected code on a 06 cobalt Friday. and remembered watching the video looked at the ftp volts while doing purge and seal test it was stuck at 1.4 volts didn't change. didn't even hook up a smoke machine. thanks for the vids man
Great video! Thanks for taking time to show. I wish there would be more people like you guys.
Great Video EricO! You are a great source of info my friend. Education is something no one steal from you. Thats what I preach to every new tech and older techs alike. Someone can steal your tools...and yes they are an important part of our job...but what you retain in the ol noggin is even more important !!
South Main you are such a great resource of auto troubleshooting info - thanks again. Now had a similar issue - different fix. Last couple of days we bought a used 06 COBALT. Lots of miles but good price. Test drive of the car showed no engine light, everything was OK, ran smooth and good. Next day the engine light came on, now I don't have the high end code reader you have that does all those tests, mine just shows the codes. First thing I had to do was figure why I had no power on the OBD port to my basic code reader. Like alot of vehicles this is powered by the 15 amp fuse for a cigarette lighter. Now even though this car didn't have a lighter, it still had a fuse for it and sure enough it was blown. I think it powered the AUX 12 volt plugin port as well ?? not sure - or at least the one on the dash. Any ways quick fix on that, new fuse and now the reader had power on the port. Codes came up as P0300 - misfire, P0446 the one we are talking about here, and P2101 throttle body position performance? Anyway I checked with UA-cam and of course went to yours first, and OH MY, well I guess lets get started. First I started thinking? We also just filled the tank with gas yesterday and the 446 code is related to venting I wonder if the gas cap is bad, removed and it looked brand new, Cleared off abit of grime on the seat and rubber made sure it was back on tight. Went in and cleared the codes and they did not return - still fine today. Just wondering what may have cause the misfire code and the TB position code? no worries right now as they have not come back either.
nice one mr O.another no parts fix keep up the good work.
SWEET THANKS, even though Im having a P0401 code the "jargon" in this video will help me track down the prob. I've replaced the EGR Valve, reset the code and it popped the next day. My next move is to clean out that passage it connects to.
Thank you for your knowledge! 04 pontiac grand prix gtp definitely saved me thank you please keep thon informational videos up
Another great video .Thank you
You ever was working around the canister before you made a mess ! Good work !
The Gatling gun approach can be very hard on the customer's pocket. I can see now that tackling these issues without a basic understanding of the workings of the circuit in hand and the ability to select the proper tools for diagnosis will lead to unnecessary mutilation and replacement of functional parts.Great practical video for anyone with an itch to shoot first and ask questions later.
Nice diagnosis & fix! You're right about testing b/c sooner or later the percentages get you and in comes a car serving humble pie to bring us back to why we test first. DTCs diagnosis on a scan tool is an art in itself determining what it really means b/c the PCM is just reporting what it sees. PCMs are notorious for reporting crank sensor faults and in reality it is the cam sensor that is bad. Performance codes or calculation codes can be fun. I hope that wiring mess was not a garage b/c it should always leave the shop the same or better than it arrived. I ordered the AESwave kit after I seen you using it and I love it! Used it yesterday on a P2135 fault and found the spread terminal doing drag tests with the kit test leads. Sweet kit!
Yep, not understanding how the systems work and interact can cause a wild goose chase. See it all the time where someone went to Da Zone, and they tell them Code PXXXX means you replace part YYYY. Then the light pops back on and it's the same code....
It's like a P0300, "oh that means you need plugs or cap/rotor/wires" Maybe, but it could also be a bad fuel pump, plugged fuel filter, bad intake gasket, vacuum leak, exhaust leak above the O2 sensor and more. Knowing what that code is and how it is processed puts you ahead of a large percentage of folks.
***** CNY 28 miles from Cooperstown? Do you know where Johnstown is at? It's 35 miles from Cooperstown and I lived there until I joined the Air Force.
Hayward's Automotive Yep, was just there today! I'm very familiar with NY as I was a supervisor for the NYS Lottery for a while.
Thanks for explaining. Great vid! Thank you!
Awesome diagnostic work 💪👊🤙
but Eric parts changing is so much fun, playing Swap-A-Roo. Getting it right the first time is such a buzz kill and it hurts the big box stores bottom line. haha Nice fix!
Hey Eric-o from New Zealand. Thanks for the great vids keep them coming...
2nd comment from New Zealand!
Badgertronix haha where you base?
North Canterbury somewhere
Third comment to Badgertronix in New Zealand from Canada . 🍺🍺
Thank you. I have been fighting a "service engine soon" on a 2005 buick lesabre.
Eric, I'm starting to miss the opening tagline: "Welcome back to the SMA channel" ...
Like the UH STICKER ON THE LIFT👍🏼
professional eric! another great vid.
Nice info Eric test is always best
I like the video
Dr. O
Your amazing. Love the video.
Good job. This video helped me.
Test, don't guess! New SMA slogan!
wish it was everyone's motto!
Thomas EXOVCDS check cold start solenoid
DJM, i have the exact same problem with my 99 suburban..did you ever figure out what the issue was?
Thomas EXOVCDS Hi my name is Christian I hope you can get back to me. I'm at my wit's end with a p0446,p0442(small leak) I have the evap canister out of the car when I plug the vent line, vps, and open the bypass the canister will not achieve vacuum unless I plug the air vent port. This does not seem right to me is the diaphragm on the canister side broken? The vehicle is a 2004 Toyota Corolla. Any response would be greatly appreciated.
I have a very similar 2007 Cobalt (vs 2008). It has a P0446 code. I recently purchased it and it has had the code since then. I don't have a fancy scanner, but I'll keep checking what I can. I tried a new gas cap with no luck. I had noticed that while filling with gas it tends to shut off before it gets close to full. I pulled the charcoal canister off thinking it might be plugged, but I'm able to blow easily into any of the 3 ports. After blowing into each port, I cleaned the vent filter internal to the canister while I had it out, but it wasn't that dirty.
While I had the charcoal canister off I tried to blow into each of the three Lines that connect to the charcoal canister. The big Vent line is easy to blow into (just vents to atmosphere). I can't blow into the little Purge line, but that makes sense as the Purge Valve at the engine is N.C.
I then removed the gas cap and tried to blow into the large line that goes to the gas TANK, but it felt like I was blowing up a stiff balloon. It would build pressure and then blow back in my face. Look at 6:04 in the video. This large line also has a Tee fitting in it that connects to a 3/8" line that goes up the fill tube and connects into the fill tube just below the restricter plate/gas cap. Maybe the large line to the gas TANK has a rollover valve or something with some restriction, but the 3/8" line probably does not. Is there a reason I can't easily blow into this TANK line, or is this a sign of a problem (blockage, etc.)?
If there is a blockage this could explain the shutting off while filling, and perhaps the P0446 Code.
I'm thinking about doing my purge valve an doin the sensor in the canister these cars are really funny can you smell gas fumes after idling a bit in the car just curious??
good stuff eric o
thanks man
from QATAR
i wish you were my tech in vancouver wea...great job
simple awesome demonstration
Great info, thanks!
Eric, great video as always. Am I mistaken or does that fuel tank pressure sensor look alot like map sensors that you would see on just about any 90's gm vehicle?
awesome job !
Great informative video...
Very specific thanks!
thanks for the video helps me understand.
enjoy your videos
Good stuff man
Good info, thank you.
YOUR THE MAN...NICE
Nice work
Awesome man!
Eric - thanks for this video. THUMBS UP ! I found that I had the exact same failure on a 2007 Saturn Ion with code P0446. The vent valve still ok and the evaporative fuel pressure sensor was frozen at 4.90 V. The sensor was also warm to the touch - so i suspect that it had some sort of internal short going on inside.
When it costs $200 to have a mechanic properly diagnose which of the 5 $20 parts are the problem, I'll save at least $100 and just do some parts swapping.
Thanks very help full
Hey someone who knows issue and understands operation good going man. Canister valve was open but you were able to close it huh . Okay got it kind of known it was what ya found . The springs in the vent solenoids must be crap. Mine is stuck open .
"test don`t guess" i love the quote .
Always enjoy your videos how many scanners do you have
Thanks auto Dr.O😉. I think I like Hunter O better plus it reminds me of hunting and that's a lot more fun then working🍻cheers
Thank you!!
So glad they stopped environmental inspections in my area ;) Fixed! lol
Hey Eric, great video as always. I am on the market for a scan tool and interested in the otc encore. how do you like it?
Hello. In your introduction, it was mentioned that there is a high failure rate. Were you referring to the fuel tank pressure sensor itself? Or just the evap system in general?
Mr.O Is there any specific readings from a scanner that you can determine if it's the canister, the ftps or the purge controller under the hood, or do you have to scan regardless of the readings
tank you, sow much good. i se fun , are from Brazil.
I think ScannerDanner did a similar video about EVAP systems. Also a very good one.
he is great.
Great video, cool test light. Can you give the product info for the test light?
good job
Good one Eric. Now as far as the electrical tape up under there. How do you address this with the customer? Do you show them the hack job? Do you just mention it as the client pays your bill? Do you offer to fix it as this could result in problems later (At a cost of course)? Or did you just fix it up real quick and say nothing? -John
A P0446 does not usually indicate a stuck open vent solenoid.Maybe stuck closed as 446 is excess vacuum. Pressure sensors ,plugged canisters etc.Here in Illinois in farm country lots of plugged canisters and solenoids from gravel/dirt roads
What make and model is your scan tool what do you think of it looking to buy a really good one but cant figure out if I want otc or snap oh or bosch there not cheap so want your opinion
I have P0442, and I changed the purge valve and that didn't resolve the issue. Should I install the EVAP canister vent valve?
You sound honest.
Hey! So I'm in the market for a new scanner. How are you liking OTC Encore? It looks like an awesome scanner.
Man, i need you on my Silverado. Got a 0442 code and a 0455. Almost certain its the vent valve solenoid.
thank you ...
Great! I have a P0446 on 2006 Sierra. The evap vent coil resistance was open, changed that. P0446 returned after a few days, but the new coil is still good. Have to check the pressure sensor, or maybe the canister is plugged. I've wondered how much air is pulled thru it, as the outside air is poorly filtered and I live on a dusty road. Maybe the air flow is so slow the dust falls out and does not enter the fuel tank. Have to Find the failed part, and change that. Won't guess.
Hows are ya, been watching your videos for a very long time. Like the vids and has helped a lot. I have the code P0466. I have changed the lines and also the Fuel Tank Pressure sensor and still have the code. I checked my gas cap and it seems to be working ok, gasket not damaged. I have noticed that the purge valve is making like a pulsing sound which can be heard inside the cabin with the radio off. I tested it and disconnected no air passes through, when connected it has vacuum; but the pulsating sound, I am not sure if it’s normal. I mean it could be but not sure if you should be hearing it inside your truck
sweet pids on that scanner
Thanks Man..excellent job...keep posting will follow.
Nice vid Doc, thanks. How are you liking the digital test light?
It seems to do the job so far
Hi, Eric. I'm getting codes p0455 and p0456 in my Civic 2018. I checked the purge selenoid in the engine bay with a vacuum pump, and it holds a vaccum pretty well. I also checked the canister purge solenoid by blowing air through with my mouth, and it seems ok, too. It's constantly open. I checked all hoses, and there are no visible cracks. What else do you think I should check? This car only has 20,000 miles on it, but it's already out of the three year warranty. Do I need to apply voltage to any sensors or both purge solenoids as well? I have a small power converter at home that I could use for that in case I need 5v to run the test. Thanks for all your videos.
I have a 2005 Cadillac Escalade with the 6.0 VORTEC in it and I get code p0446 evap vent valve circuit malfunction, I already replaced the vent valve solenoid under the truck and the purge valve on top of the intake and the code still comes back? Any ideas thanks and love your channel.
I've been looking at the otc encore for awhile how would you say it compared between your snapon and Autel. hint hint video comparison
eric you gotta give the people what they want, wheres a toolbox tour!
As always an education. I was looking at picoscopes website, they have some good case studies, which were victims of swaptronics,which were free to read.
They have a great web site
I had a 2006 Saturn Ion and salt ate through the wiring back there.
Do you sell the test light with the digital readout? I checked your Amazon store and didn't see it.
Will that solenoid being faulty cause pressure to build in the tank?i have to remove the gas cap the release pressure constantly?? also it makes like a burping type sound.any suggestions would be appreciated.
98 f150 4.6
How common are Cobalts in your shop and what type of problems do they have? I ask because I own a 07 SS and haven't had any major issues with mine.
YeSir.u. The.MAN...
Had a P0446 on my Saturn 2.2 the wiring harness was connected but hanging loose im pretty sure one of the wires within the harness was broken
I had the same issue. I have a 00 lesabre and it threw a code for a evap fuel tank pressure sensor high circuit so I just replaced it.(p0446 or p0457 something like that).I now have an intermittent p0440 code which is a general evap leak code. I am assuming that the sensor was bad, but now the system can actually detect a leak lol. Not to sure what it is. Don’t have access to a fancy diagnostic tool. I’m assuming it’s a venting problem thought because when the leak is detected and the light comes on it is when my tank is at around a 1/4 tank. When I go to fill up the tank and take the gas cap off i can hear air being sucked into the tank. I also found out when I have the car in the on position and the fuel pump is primed and I am filling up with that code on it cause fumes ( and gas when I am pumping) to be pushed out of the gas filler.
Any ideas anyone?
I’ve got an 02 Monte p0446 code evap system vent control circuit and since the time my check engine light came on my gas gauge is all over the place sometimes is this connected absolutely right?
I'm sure you knew this Eric but in case others don't know yet. You can force a self test by warming up from a cold start with the AC and all the fans turned up to high for 3 minutes then drive a little. The self test will complete within the first block after that. This is on most GM's I believe. This will fix problems associated with battery disconnections which can prevent you from passing certain tests during a smog check. The advice to be driving around under 55 or 60 for a certain number of miles to get it to self test simply does not work. Most of the so called 'certified smog experts' simply do not know this fact because they are stupid and did not do their homework.
where did you buy your digital light tester ?
How much is this repair on a Pontiac g6 (I seen your video with this exact problem on a g6)
i have a 98 integra gsr and i have about 7 codes of dtc wichbis like evap codes and the only thing i notice is bad is the charcoal canister is sun cracked but when taking it to the inspection they tell me it cant communicate with the computer
i have 2005 cobalt ls the voltage tested at that connector is 14 v! is that normal or just over-voltage as compared to what you says 5 v? i still get p466