Thread: P0440 is driving me nuts!

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  1. #1 P0440 is driving me nuts! 
    SE Level Member PTGsDaytona500GTP's Avatar
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    I replace my gas cap....didnt fix it.
    I replaced my Purge Valve....Canister Purge Valve Solenoid | 2000 Pontiac Grand Prix 6 Cylinders 1 3.8L SFI SC OHV | AutoZone.com...didnt fix it.

    I dont see any cracks in my hoses.
    Please someone tell me what i should do to fix this. I really really hate taking my car to the shop bcuz i dont trust them and they over charge.
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  2. #2 Re: P0440 is driving me nuts! 
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    I did the same things no results either
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  3. #3 Re: P0440 is driving me nuts! 
    GT Level Member gtcoup's Avatar
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    i was in line to get a sicker on friday, legit pulling into the garage this code came up. needless to say i am riden around with no sticker, and an illuminated ses light.


    Smgpfc
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  4. #4 Re: P0440 is driving me nuts! 
    GTX Level Member GOTIT4CHEAP16's Avatar
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    I too have had this check engine light since i did my swap 2 years ago and been on since. Ive done everything and wont go away.
    Gen V, 3.0, Stage 2 heads, XP Cam, SD Headers, N*, LQ4, ZZP Stage 2 Gen 3 Intercooler, CAI, AL 104's Gapped to .055, #130 Springs, 42.5lb Injectors, ZZP Tune.

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  5. #5 Re: P0440 is driving me nuts! 
    SE Level Member L KELLS's Avatar
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    I have a friend who had this same problem on his 04 GT and it turned out to be the gas tank filler neck vent tube. its a little hose thats runs along side of the filler neck which acts as a vent for the tank. That has a hairline crack in it sending off the bad gas cap code.

    BTW..... Its a dealer only part
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