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Come along with Eric O. and have a look at this 2008 Pontiac Torrent 3.4 with a "P0455 Large / Gross EVAP Leak." Now this a very common problem and is often misdiagnosed as a gas cap or a canister vent solenoid. In this video we have a look at the whole system from the canister vent, fuel tank pressure sensor and the often over looked purge solenoid.
GREAT EVAP VIDEOS FROM "WELLS TECH"
Wells TechConnect Ep.20--EVAP Leak Problem, But No Smoke is Found! (P0442, P0446, P0455) - https://www.youtube.com/watch?v=u2yPUTA3pEY
Wells CounterPoint Ep. 19 Evap System Problems...Where to Start (P0455, P0440, P0442) - https://www.youtube.com/watch?v=W4dCISh9DD8
Wells CounterPoint Ep. 26 - P0446 Vent System Performance - Diagnose & Fix it Right the First Time! - https://www.youtube.com/watch?v=Xc4UJIU0M70&t
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50 thoughts on “Gm p0455 large evap leak – what to check when it’s not the gas cap”
  1. Avataaar/Circle Created with python_avatars Bart Young says:

    As Hannah says “every tool has a hammer side”!

  2. Avataaar/Circle Created with python_avatars ManyShallKnow says:

    What model sCan tool are you using ?
    Also when you did the first part of the video where you close the vent an you watched the fuel tank pressure numbers go up. That’s sorta like a smoke test without the smoke machine 🤔 awesome video btw. I’ve watched it several times to fully understand.

  3. Avataaar/Circle Created with python_avatars noel castle says:

    Another great diagnosis with well explained procedures and system.ooeration . I could see how it could easily be misdiagnosed. Interesting how you could see the PWM making the test light flicker must run a very low PWM frequency .

  4. Avataaar/Circle Created with python_avatars Shawn Withee says:

    Again thanks for your time knowledge and professionalism awesome video

  5. Avataaar/Circle Created with python_avatars Jessie Goss says:

    Nice video.

  6. Avataaar/Circle Created with python_avatars Bo Knows says:

    My daughters 2008 lincoln mkx is coming up with p0455 code 🤦🏼‍♂️ similair parts needed as those in your awesome video? 😎

  7. Avataaar/Circle Created with python_avatars Maxim Teleguz says:

    I currently have underboost P0299 then when I wouldn’t reset that code I would get a P0455.

    The low boost causes the engine to lag and no turbo use.

    As soon as I reset the low boost I don’t have any codes but low boost come up a bit later. The only time Evap codes come up is when the car purposely lags because of low boost and I don’t reset that code and keep driving. As long as I reset the low boost I have boost and no codes until a bit later.

    I don’t know how to fix this.

  8. Avataaar/Circle Created with python_avatars literalist says:

    I think I'd rather own that tablet than that car.

  9. Avataaar/Circle Created with python_avatars Steven Rice says:

    Thanks again Dave O!

  10. Avataaar/Circle Created with python_avatars davec415 says:

    my leak is in the vapor line. no video showing how to repair it?>?????????? 2004 hyundai elantra and it's not the gas cap

  11. Avataaar/Circle Created with python_avatars Bill Meyers says:

    Great video. Fighting the P1445 code with my 1998 Mustang Cobra…

  12. Avataaar/Circle Created with python_avatars Mike Arceneaux says:

    How can I get in touch ? Got some questions on my 2013 gmc I’ve changed and tested about everything and still throwing the code and getting absolutely terrible fuel mileage / bad idle etc … hoping I could email or something and get some advice …it’s wearing me out lol

  13. Avataaar/Circle Created with python_avatars David Nie says:

    Thanks for going thru the steps to diagnose the problem. I have the same code reader and it helps me get thru the diagnosis.

    Curious if you could throw some advise out for a 2500hd with random misfires on cylinder3 and 4…dont know if you do things like this but I've pretty much have been done the rabbit hole with this thing and am running out of solutions….thanks and great videos

  14. Avataaar/Circle Created with python_avatars Luis Pichardo says:

    Hi! I have a 2004 Chevy Colorado that has the check engine light on. It’s been on and off since I bought it. November 2018 approx. i have replaced almost every single componen in the evap system; from the charcoal canister to the purge solenoid. I have not had any luck locating the cause. I am about to replace the crankshaft and camshaft sensors along with the MAF sensor and see what happens but any idea why that engine light flickers from time to time? Thanks!

  15. Avataaar/Circle Created with python_avatars ohhhsnap17 says:

    Well this is pointless for your average diy. Not everyone just had a grand to buy a diagnostic tool.

  16. Avataaar/Circle Created with python_avatars Jamie Price says:

    I have been a mechanic for 40 plus years and I would bring my vehicles to you for repairs if I lived in your area 2 thumbs up

  17. Avataaar/Circle Created with python_avatars Maddmavic says:

    Can evap code like this cause a mis fire

  18. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Simple Diagnostic tests you definitely can be lead down the wrong path with these evap codes it is definitely stuck Closed good Work as Always Eric O @SouthMainAutoRepairLLC

  19. Avataaar/Circle Created with python_avatars Herman Rogers says:

    Some cars don’t have a gas cap so cars are nothing more than a lawnmower

  20. Avataaar/Circle Created with python_avatars Steve Thatcher says:

    Best comprehesive video on common evap issues I have reviewed.

  21. Avataaar/Circle Created with python_avatars Sheikh Zahid Hassan says:

    Please advise for my Dodge Durango 2018 Gt which scanner is suitable like in video you did ??

  22. Avataaar/Circle Created with python_avatars Shawn Withee says:

    Thank you for your simple but somewhat confusing explanation of a problem I seem to be having with my 2003 gmc envoy sle. I don't smell fuel or see any signs of leaking from hoses or tank but my truck seems to lose gas fast most of the time so that's why I said confusing. I'm old school mechanic now I'm just a parts changer with the valuable advice from you a true professional mechanic. The Mackey mouse code readers from local auto parts store don't give in depth troubleshooting like you have here. I grew up with Chilton manuals and no sensors and plastic parts with over thought bad designs. I will change my evap sensor when I get the extra cash and again thank you for this video your time and freely giving your knowledge to me the guy that can't afford someone else to do what I can and like to do myself.

  23. Avataaar/Circle Created with python_avatars RCB says:

    hello, just ran across your content i can say you are very thorough……i just subscribed thanks for content

  24. Avataaar/Circle Created with python_avatars Gilbert McDonald says:

    How mechanically serious is an evap issue

  25. Avataaar/Circle Created with python_avatars LucianoJuly says:

    Thanks

  26. Avataaar/Circle Created with python_avatars F Griffiths says:

    man i would definitely bring my car to you but you're 5 hours from bklyn,ny LOL. love the video and i will subscribe to your video. 🙂

  27. Avataaar/Circle Created with python_avatars Just Me says:

    My check engine light came on right after an oil change which was odd because before that it was not coming on. Code came back related to evap leak.

  28. Avataaar/Circle Created with python_avatars Pedro Ventura says:

    I have code p0455 & currently having a leak in my evap after doing a smoke test, I realize it’s coming out a little box connected to my charcoal canister but unsure of how to fix that

  29. Avataaar/Circle Created with python_avatars Beast says:

    Oh yes that money light. Or I have called it the get down under on the ground light. I liked the tip on the charcoal clogging the line. One would think a filter or screen would be in the line. I am going to replace the canister since its 21 years old and behind the rear fender liner driver side. Also all valves and related hoses. But for fun will try gas cap first. I have detected a Oder in that area.

  30. Avataaar/Circle Created with python_avatars David 1childers says:

    Great info

  31. Avataaar/Circle Created with python_avatars Fabian Lacey says:

    He’s right about that money light sh**t drive me crazy

  32. Avataaar/Circle Created with python_avatars JL16 says:

    So if the purge valve is not sucking your finger is no good?

  33. Avataaar/Circle Created with python_avatars spookey 2 times says:

    Money light 🤣

  34. Avataaar/Circle Created with python_avatars wayne mintz says:

    I love watching you , I own nothing new, But watching you, you have steered me in the right direction to find my problems with my 1994 Plymouth Grand Voyager 3.3 engine , my 2004 S Type Jaguar 3.0 engine and a 1999 chevy Truck 454 engine. I have my hands full trying to keep everything going. You are GREAT thank You.

  35. Avataaar/Circle Created with python_avatars Kirby Ammons jr says:

    Where's Purge Valve located on a 2010 F150 5.4 engine

  36. Avataaar/Circle Created with python_avatars JR Bird says:

    Great info! Thanks! I went from a PO449 to a PO455 after I replacing the evap vent solenoid on a `08 Corvette. I verified that it was faulty by applying 12V to it. I'm going to replace the gap and if that doesn't resolve the LARGE leak, this will help!

  37. Avataaar/Circle Created with python_avatars Chris L says:

    My vehicles money light came on and the local guy wanted $1500 to replace the evap solenoid, canister, and 2 o2 sensors. Watching your vids, i did it myself in a couple hours and $200 in parts. Thanks!

  38. Avataaar/Circle Created with python_avatars William Newman says:

    What’s the money lite ?

  39. Avataaar/Circle Created with python_avatars Mike Robbins says:

    👍👍👍👍👍. Good job Eric…