Symptoms and Diagnosis of a Bad Evap Vent Valve Solenoid - List of Codes Included

In this video I will go over the symptoms of a bad Evap ( Evaporative Emission) Vent Valve / Solenoid, and also how it works plus how you can easily diagnose it without a scanner. Plus here is a list of codes that could be as a result of a bad Evap vent solenoid and cause you to have a check engine light:
P0440 - General Fault in the Evap System
P0446 - Evap System Vent Control Circuit Malfunction
P0447 - Evap System Vent Valve / Solenoid Circuit Open
P0448 - Evap System Vent Valve / Solenoid Circuit Shorted
P0449 - Evap System Vent Valve / Solenoid Circuit Malfunction
P0455 - Evap System Large Leak Detected
P0456 - Evap System Small Leak Detected
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Disclaimer:
Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches.

[@powerspeedutube]

Swearing or no swearing ,you still one of the best reviewers on youtube.Nicely explained so most of us can understand.Keep up the work,most of us are extremely grateful and appreciate it.

[@gardenstateflatlandb]

If anyone is having trouble pumping gas in this model car, you definitely want to check the filter tube vent. This is located driver's side rear wheel well. You will have to remove the wheel to get access to the plastic shroud in the wheel well. The filter tube vent is located behind there. You'd be surprised how much road debris actually gets trapped up in there despite it being covered. When I cleaned mine, I removed a dustpan sized pile of dirt and sand. In my case, cleaning that filler vent did the trick allowing me to pump gas, and not have to do the "flip the gas nozzle upsidedown" trick in order to pump gas. 3 years since and still pumping gas fine. Just a quick tip no one really talks about. 😉

[@codyshuey258]

My code says that my "Evap canister purge vent" is blocked. Do you know how I would fix that?

[@gardenstateflatlandb]

@@codyshuey258 Search KZbin with the year make and model of your car, and evap canister vent valve/solenoid. On a 2001-2006 Hyundai Elantra that valve/solenoid is located in the charcoal canister housing located left rear...under the bumper and behind the left rear wheel. Open the housing, disconnect the hoses, and check for charcoal or any other blockages in the valve and in the hoses connected to it. Might possibly be your valve is stuck closed and unable to open and close as needed. If that's the case, a replacement would be needed and is fairly simple and inexpensive. Sorry, if that's not the info you're seeking. Good starting point at least. Good luck.

[@LongTimeTTFan]

Clear illustrations. Detailed explanation. Good vid quality. No distraction. No noise. No shaking camera. Excellent. Thanks a lot.

[@myRatchets]

Thanks for your comment, glad to hear you see the work that goes into these videos. cheers

[@ramonv-h5719]

💯

[@Funky4me21]

I agree great Video... I learned so much in my time of KIA ordeals

[@willrice2792]

Cussing while working on an evap system is required for a good repair!

[@pothead503]

Cussing is a necessity!

[@bvnseven]

@@pothead503 That's right, Dammit!

[@themanfromcabowabo1559]

Remove evap system, substitute vehicle. Routine maintenance is optional.

[@stanleymosel6049]

Cold beer helps the job go smoother.

[@tyleradkinson5753]

Check

[@Mechrank]

Your approach is so effective that for every problem, like no one else, you make a schematic to explain it’s principle of working. 👍🏻

[@zakf6140]

Love this guy's videos, great quality and legitimate explanations and breakdowns. I've talked to other "professional" mechanics that can't give a clear breakdown on issues. You have helped me turn into a pretty competent DIY mechanic for myself, family and friends

[@ALVHUN]

Very helpful video. I am a tool & die maker in the automotive sector. When I asked this error code to be explained, I was told things that made no sense. The more clarification I asked, the more I realized I was being sent down a rabbit hole of being ripped off at a Ford dealership. Can't stand these repair sales folk who think they can sell a story to anyone and everyone will believe them. Thank you for the enlightenment.

[@reweydewy]

half the time the service advisors have no clue of a cars systems and how hey work exactly

[@buzoff4642]

@@reweydewy Verbally, when it comes to large leak, they tell me their guessing which part, as they've replaced them one by one. Now that I want a state waiver from any more evap bills, in writing, it says "Customer is refusing general diagnostics." ?!?

[@MR..181]

Exactly prepared for 2 cat converter buys

[@MR..181]

And loss of cars cat converter

[@aviewaskew706]

This 10 min was more entertaining and informative Than season 4 of fast n loud . I swing from your knowledgeable sak brother Thanks

[@donaldstiegler3608]

I've watched 15 or 20 videos concerning EVAP System problems (PO447) yours is the only one that helped. Great illustration, great description, and good videotaping. Thank you!

[@brentburek]

You are seriously the hero of the day. This just saved my butt completely. After checking the wiring and replacing the solenoid With no luck of getting rid of the code, i watched your video. Unhooked everything and dropped the Evap canister blew air into it to see if it was clogged. Seemed fine. Traced the hoses back only to find dirt packed completely in the outside vent. Looked like the vent cover may have been reinstalled upside down by someone so it was able to fill up like a cup. Anyways thank you so much ! Blessings

[@ajackson7387]

Awesome I have to check my system when I put gas in my car an O2 Kia Optima V6 it keeps popping off you guys are the best

[@jcmyrick7581]

I know this is old, but thank you. Been looking at this, everyone talks about replacing the various parts, but no one shows a simple schematic of how the system works. Best info I've found in several hours of searching.

[@jonathanjimenez1732]

The best video of a mechanic swearing and explaing how things are done. Amazing tutorial!

[@GarthGoldberg]

This is the best explanation of the EVAP system I've seen.

[@myRatchets]

Glad you like the video, thanks for commenting.

[@kelvinrandolph8026]

code p0621

[@johnsaccoccio7373]

Dammit, when will the Czech's build an OBDC scanner protocol proxy device that continuously sends a reset to the car's computer while at the same time sends a "We're cool here, nothing to see" output to the DMV's connection? Because sending perfectly running and SAFE cars to the crusher due to yearly DMV crucifixion is killing us.

[@linwoodfactz3797]

Your smart. Thank you for your contribution

[@buzoff4642]

@@johnsaccoccio7373 I'm fairly close to that (perfectly running and safe, sent to the crusher) myself. Dealer and mechanics can't resolve P0455, for the past 2 years. I don't understand the necessity of having the system open for purging. Closed fuel system with one-way inlet of air to avoid vacuum, would seem to do the job.

[@drmikeosgood]

Real nice explanation of the evap system. Now I know where to start testing for my code error. THANKS !!

[@justpapa3163]

Well done, very well done. My dad was called Maestro by all his friends when fixing their cars in our garage drinking bear. I can say that your friends and myself can and should call you Maestro. You explain the process very well thanks for the info.

[@halleffect1]

You did a really good job explaining this. I was struggling to understand the vent solenoid until now. cursing part was funny too

[@vunit8213]

Awesome detailed video! Exactly what I needed....I like the way you draw out diagrams and make them simple enough a simpleton like myself can comprehend...I had code P0449 and followed your instructions...I bench tested it with my power probe and get 12v on hot side and 0v green light negative on control side, however I don't get an audible click whatsoever when I supply 12+ v through my probe..I also used my bi- directional scan tool to help troubleshoot and test, still no click! I'm gonna buy a new vent solenoid.... thank you.

[@creektalk]

This video was very helpful. I been having problems with my Jeep Grand Cherokee Laredo 09' I thought it was my spark plugs and cord's and spark wires. So I changed them and the problem got bad. So I drop my gas tank and changed the fuel pump and still was acting bad. So I read up on it and now I probably know it's a bad purge valve. But I'm glad I changed everything myself and I'm learning as I go along in life.

[@ericmiller204]

Very informative. I found it easy to understand, with common-sense explanations. Got my car fixed myself when the garage guy couldn't! Thank you!

[@pisces3121]

Amazing!!! THank you! We live in good times with guys like you and KZbin to teach us!

[@markusstaff3857]

Thank you for this video! I had a P0442 code and was doing all kinds of research trying to diagnose it. Your video helped me understand the evap system better and I was eventually able determine it was the vent valve. Apparently I backed into something and damaged it. Anyways, I replaced the valve (and some other evap components) and yesterday I passed smog :D Again, thanks for this video and the great info you provided!

[@rjjt1294]

Great tutorial. It gave me an idea for further troubleshooting since I have a pesky P0440 and P0446 issue. I will check for ground continuity and partial solenoid closure/leak since I've verified power is supplied and the solenoid "clicks" when bench tested.

[@oby-1607]

Was looking forever for the in depth explanation of why my car wasn't taking gas. Thank you for the info. Greatly appreciated.

[@xelaju8]

I had 3 codes, I fixed two, and this one is the one that is giving me problems, but I will use my test light to see if I get any voltage. Thanks for the info. Very helpful.

[@chikapr27]

Your my favorite teacher of auto mechanics. Thank you!

[@take10creepy74]

We've been in producing for decades, have to say my friend you did a fantastic job of presentation and explanation. I went looking specifically on how test a solenoid on an evap canister, look what I found. Thanks! Great vid.

[@peterolsen1030]

Very good and concise explanation of the EVAP system. I was able to diagnose a bad vent solenoid and was back on the road shortly after. Thank you!

[@vdog8100]

Your very detailed description, helped me troubleshoot and repair my Nissan Titan in minutes. My bad vent solenoid was always stuck closed. Giving me a ODB code P1444, and a check engine light. Thanks for the informative video!

[@stephaniemolina6928]

love all your videos!! being a women who is tired of machanics taking advantage of women !! you are on my top 5 machanics i go to when i have a problem. I enjoy all the videos i have watched !! Thank you so much!!

[@nickglumac3185]

Many thanks. Very instructive and clear. Nicely done!

[@muthakinali5878]

This video made more sense to me then all the mechanics I have spoken to regarding my Evap issue

[@sudipmallik1584]

Thank you for the simplified diagram and explaining the areas of possible failures.

[@johnnydegeorge2132]

Your humor is very funny but it is also perfectly portioned. Keep that balance.

[@keithdavis3411]

$400 new oem canister on 95 maxima

[@garyr7027]

Tanks also have pressure sensors that the PCM uses to determine how much vaccum pressure the tank needs, in order to know what signals to send to the purge valve and the vent solenoid. The gas caps is also vented to let in fresh air to the tank upon vaccum pull from the PCM. Caps determine open or closed based on vaccum and gas pressures and vary based on tank pressures.

[@rolandrobinson499]

Great job on the explanation !!! I've had this problem for awhile now and I feel more competent about knowing what's going on thanks for this video.

[@nakialisette]

Wow....various garage guys have been throwing vocabulary at me for a week now. I'm not a helpless girl when it comes to cars but the whole thing was getting on my nerves. THIS was an AWESOME explanation. We'll be able to get the car to pass inspection now that we know what to look for and replace/repair. THX!

[@dc5723]

Awesome video/information. Thanks very much!

[@petrocksgarage]

That voltage on the Ground side is called Bias Voltage. It is a common technique in circuit design to detect if there is a problem with a sensor circuit.

[@cloutkingupnext4721]

Potentially telling you the sensor / evap vent is bad right?

[@petrocksgarage]

@@cloutkingupnext4721 possibly. If the bias voltage isn't at the expected level it could indicate a problem with the solenoid, but it could (also) mean there is a problem with the wiring. e.g. a damaged/corroded wire. Don't fall into the trap of automatically assuming the device on the circuit is the problem.

[@goesfastandfar]

Really good overview of the EVAP system that's easy to follow and diagnose the potential problems that may occur. Also enjoyed the "Blues Brothers" cursing session!

[@jmo6688]

concise and clear statement about how the evap system operations and how it works. Thank you.

[@DamienOrozco]

Very cool advice. Thank You for this information. My car got rear-ended and the code identifies this as the issue. So I guess when the car hit me, it damaged this component.

[@fountainpenracing]

Thanks for the complete explanation of this relatively complex system.

[@MrAjusog]

The illustration was good, perfect for explaining the system. Thank you!

[@JohnRamirez007]

Thank you for this video, I've seen others but this explains the evap system the best. Now I understand my P0440 code dilemma!!

[@Bruel111]

Love your drawings, always spot on for the video. Your explanations of systems and symptoms are always complete and informative without running long and droning on.

[@myRatchets]

Glad to hear you like the quality of the video's, I've gotten better at presentation and editing over the years. It is alot more work on my end but the final result is better for the consumer. cheers

[@joker2712005]

Thank you SOOOO much for this video!!! I've been trying to find a vacuum leak for almost 18 months and I couldn't and every shop I took it took said their wasn't one bit I knew from the rough idle there had to be a leak.. And finally it's found!! Thank you so so much... My car never threw a code bc the electric solenoid was working fine, but the diaphragm on the other side wasn't holding a vacuum and there for gave me a vacuum leak.. I really hope this video helps others like it did me... Thank you again - Ive learned a lot watching ur videos...

[@desireerabbitt6647]

William penrose where did you find it at

[@Infinitpossibilities]

My engine stalls occasionally (diesel 220cdi merc) and then recovers within secs whilst driving or may die if ticking over...could a blockage in the evap system cause this?

[@user-ju3od5gy5q]

@@Infinitpossibilities take the purge valve off, carefully; then get a $13 pressure/vacuum gauge from harbor frieght store, and connect Vacuum/pressure gauge line to canister purge solenoid/valve's "air output side" hole, then blow air into (or try to suck vacuum air) the Vacuum side hole of the purge valve. If the Vacuum gauge needle moves while you are blowing air into the purge valve, then your Purge Canister Valve/Solenoid is Leaking. If you get Free Shipping (go Amazon). If no free shipping, probably best to go to DIY friendly AutoZone and also Register on their website to get Free access to their Professional Repair Manuals (they recently purchased national auto repair manual company).

[@codeyhanna767]

Great video. I have a evap code on right now. This really helps and the explanation behind what to do is fantastic. Thanks for explaining the whole set up and how it works. Also shared the video.

[@MegaLisa47]

this guy is great ,out of most videos i have watched , he is the only one that explains everything where i can understand , thank you ,

[@mendez771]

Man !!! This is great example and explanation it’s like watching Sesame Street, for grown men.

[@alm7707]

That's a really good explanation, Thanks, I think you could add that on start up the computer puts ground to the vent solenoid and closes it so a leak test is done on the fuel system. Vacuum is pulled by the engine and if the tank has a leak (loose cap, cracked hose or leaky or non closing vent solenoid) a code is set and check engine light comes on. Feel free to correct me if I'm wrong. Thanks again.

[@Papopiringa]

Thanks for the great explanation of the evap system. Very clear and concise!

[@chuckdobbs9899]

Thank you. Great video. I have not been able to find a really good explanation of the EVAP system anywhere until now. I'm a subscriber for life. You just saved me a ton of money and time.

[@mlez7197]

Great videos keep making videos thank you

[@masterplumber5319]

THANK YOU BRO !!!! GREAT INFO / EXPLAINED PERFECTLY FOR DUMB AceSS LIKE ME, ME KEEP DOIN WHAT YOU DO !!!

[@SOLIZ49erFAITHFUL]

I had to watch his video a couple times just to understand how the system works and by the way thanks for the tips keep up the good work

[@ricardovelez300]

First video I see somebody taking the time to describe evap systems on Hyundai..Excellent !

[@buzoff4642]

Thank you for the overview of how this is _supposed_ to work. Are gas vapors so prolific that they needed to create this horrific overly complicated EVAP system? I understand one-way valve letting air in for gas burnt so it doesn't create a vacuum. I don't understand the reason for a purge out of air, which looks to be where the complexity comes in, in system design, maintenance and repair.

[@charlietate5514]

Great video!! Just an FYI... There will sometimes be a slight charge on the ground side of a circuit. This is called a " static charge". When you touch your test light, or anything conductive, to it.. It's called a " static discharge".

[@mondomikeg4921]

Very informative, well detailed and I really like how everything was drawn out. 9/10 would do it again... Much Love

[@4001cobra]

Great video, just helped me fix a p0440 code on 99 Subaru legacy that's plagued my car for a while. I've had several mechanics look at it, I vacuum tested all my lines and even smoke tested, no leaks. Turns out my vent solenoid was not closing all the way, held no vacuum.

[@totalannihilation9065]

Let me add to this video that the testing of the selenoid cables is very important. I spent almost 1000 dollars trying to fix a P0401 code on my Tacoma almost 3 years ago only to find out yesterday that a cable connection was the problem. Wiggle very gentle in different positions while testing it.

[@TrailBusterBrute1]

For the gas cap small vacuum leak, you can replace your gas cap with an OEM one and still not solve the problem if your filler pipe lip is corroded. It must be smooth or you are going to spend a lot of money on gas caps.

[@bsmoovekutdr]

Awesome job with the explanation and demonstration. Thanks for doing this.

[@rosss11]

I enjoy your videos... had issues with my XC90... a hose just came lose but not completely... u would have saved me a load off time it your video was made a year ago... thanks again for your informative videos

[@CHIBA280CRV]

Hey that was a good freaking explanation , o shit I cursed , ah damit !!

[@blueflame4509]

Changed them all, it's my charcoal canister, and it is on top the tank. Part over 100 bucks on an 04 grand prix, what a load of crap

[@Holey_Moley]

1 more reason the you’d get a P0994: I found I had a leak at the tank where the hose connects to the charcoal canister. So basically, the PCM thought the vent solenoid wasn’t closing, when it was actually a huge air leak that made it seem that way. Thanks for the explanation and the code list in the description. Between you and BriansMobile1, I know everything about my evap system!

[@Golyamkur]

Very nice and informative description of evap system. I have a 2002 Mercedes Benz CLK55 and got a check engine light for codes P0170/P0173 Fuel trim Bank 1 & 2. I was going nuts looking for a vacuum leak. The only thing I have not checked is the evap system and those valves. I hope my vent valve is stuck open and causing my fuel trim issue. I bet it is. Oh just one thing more. I have a 2001 E55 that sat for 5 years and gas went bad. Drained bad gas, R&R fuel pump and filter, but now the gas tank is pressurizing which makes it "Hard Start" condition. I suspect also a vent solenoid but stuck closed. Thanks for the valuable comprehensive information!

[@chungaleta1234]

Like you guys never swear!!! C'mon,,, that was hilarious

[@myRatchets]

yup pretty funny I thought as well.

[@samuelm370]

I don't swear since I had a radical encounter with the Lord Jesus Christ

[@stevewarren3051]

The subtitles picked up the profanity fine but missed a lot of the rest. Pretty funny.

[@myRatchets]

lol

[@rynm83]

🤣🤣🤣🤣☠☠☠💀💀💀

[@mkthornell]

I've watched several videos on this subject - got the dreaded check engine light, cleared it and it came right back. Your video explained the subject very well. Thank you. Now could you come on over and test mine for me? Ha! Thanks for being clear and providing a easy to understand illustration. Peace!

[@EmmaKatherine]

This was the most helpful thong ever to understand what might be happening to my car. Thank you so much!

[@kellyyork3898]

Nice technical drawings...seriously. You should write technical/informational booklets. (I hope your mom isn't watching your videos.) : )

[@aadil-ahmedshaikh5692]

Could you do a video on how an EGR system works? P.s. I found the swearing quite funny tbh 😂😂😂

[@myRatchets]

I have an older video on the EGR system, check it out in my channel. Let me know if its good or not, maybe I'll do a redo of it. cheers

[@lashlarue7924]

This is an excellent video. SUBSCRIBED. Thank you for enlightening me. Too bad multiple dealerships in my area, plainly obviously, can't tell a purge valve from a vent valve. If you want the job done right, do it yourself!

[@hotmasked1]

You are the KING of Mechanics! Simply Amazing !

[@untraditionalministries4588]

thanks guys not sorry bout da cussing lol😅😅

[@user-eu4lz3zp7b]

Aaron Frazier Hey I got a P0496 code on my 2007 Cadillac CTS. Says System Flow during non-purge.

[@thatguythatdoesstuff7448]

@@user-eu4lz3zp7b Purge solenoid is bad. Or there's a leak between the solenoid and the intake manifold.

[@Scorpio_1974]

3:51 LMAO!

[@condor5635]

14 year old Suburban with 235k miles. Never had any issue with evap system until recently. Have the evap system small leak 0442 code. Suspecting one of the valves or charcoal or maybe a line leak/connection. Don't have a smoke machine so might just have to be hit or miss . Don't know how that charcoal has been effective at filtering vapors over that timeframe! Not complaining. Great video. Thanks

[@hmroa3056]

One of the best videos on the subject. I had a lot of questions about the vent valve solenoid. You provided a lot of good information for me thank you.

[@markmillers4491]

" Do you ever have a problem putting gas in your car? Roll up your windows and eat at taco bell.

[@brown5252]

Asking for a bad day!

[@MrOloyinbo1]

Pretty awesome and darn good. Rock on. Profanity don't suit you tho....

[@xfacter75]

Thanks I learned a lot from your video first time Ive watched itI believe I’m going to subscribe once again thanks keep up the good work

[@oljames1687]

That happened to my aunt's '05 Sedona. She took it to a mechanic down the road and he said it needed a new cam, lifters and a head job. I put my code reader on it and she told him to hold off and replace the solenoid. he did and it's still running great.Thanks for making this video...!!!

[@myRatchets]

That has to be the worse diagnosis of a bad vent solenoid that mechanic did on your aunt's Sedona..lol

[@wholeNwon]

Guess he had a boat payment due.

[@paulmonk7820]

Hope she found a good mechanic! This doesn't sound like one!

[@PsycoVictor67]

3:50, the pcm is always a b**ch

[@MrBow54]

Hey! watch that language

[@myRatchets]

I can't thats just how I am.

[@drobousmc]

Awesome explanation! Thank you!

[@wallykaspars9700]

This video is a great help. It's better than the repair manual. I'll try the tests. Whenever I open the trunk of my 1998 Ford Escort it smells like a refinery.

[@mac7949]

Great job explaining EVAP system!

[@robt7548]

thx for the video. definitely the most descriptive one covering p0446

[@vvong-sr5nq]

Thank you for this informative video. I recently brought my Prius to the shop and had it pressurized with a smoke test and found no leaks I suspect that it could be the vent solenoid. The check engine code was P0456 which is EVAP small leak! The car will be going back to the shop a second time to confirm this.

[@Jursaw]

Another great informative and entertaining video from you. Keep your videos coming

[@myRatchets]

will do, thanks for watching and commenting, cheers.

[@ramiroalcala3004]

Great explanation!!! Very helpful!!!

[@derrickblackburn2062]

thanks man, I really needed a EVAP boot camp, im working on modern cars often and I came from old CIS and diesel cars.

[@iklp1983]

Very well illustrated. Thanks

[@myRatchets]

Glad you like the video, thanks for commenting.

[@Chad-servesGod]

I have watched several videos to get my head wrapped around the evap system because I have to know how the step I am doing is affecting the entire system or pause the video after step execute it, and then listen to desired outcome. If they don't match, I still can't diagnose because I am not familiar with the terms. Your explanation of the entire system fixes all that. Thank u sir.

[@christopherwilliams4097]

Thank you, Thank you, Thank you! I’m having these exact symptoms on my 2013 Ford Fusion and I’ve already purchased a replacement vapor canister vent valve but I didn’t fully understand how it worked/how it would give me these symptoms! But thanks to your video and diagram, you have given me all the information I need to fix my issue! Great job sir!!!

[@rochellestockman9125]

Excellent. The general code of p0440 makes me think of a wild chase for a fix but we must begin somewhere. Its not the 5 gas caps that each mechanic has replaced. lol Thank you so much.

[@danielworden4695]

I pured your language .you did a good job explaining how the system works thank you .

[@josemsm80]

Yes great explanation of the evap system. This helped us find a problem