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PO440 code

This is a discussion on PO440 code within the Computer & Tuning forums, part of the LSx Technical Help Section category; I recently bought another TA after my last one was called a total and now after about a week i ...

  1. #1
    Member egod's Avatar
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    Navy Blue Metallic
    1999 Trans Am

    PO440 code

    I recently bought another TA after my last one was called a total and now after about a week i get a SES light. I got it read at Advanced Auto and it was the evap system malfunction. Can anyone tell me what this could be or what is the technically the evap system. I was thinking A/C but my dad thinks it could be the fuel system. Thanks

  2. #2
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    It has nothing to do with the AC. First thing to check is the gas cap for being correct, good seal, on tight, etc. My girlfriends car kept throwing it and even though the o ring seal didn't look too bad a new cap took care of it. If replacing the cap doesn't take care of it you'll have to look at the rest of the EVAP system.

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  4. #4
    Member egod's Avatar
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    Navy Blue Metallic
    1999 Trans Am

    Thanks alot guys, that link looks really helpful at a glance so far.

  5. #5
    If you got gas within probably a day of the code coming up, take the gas cap off and put it back on. Make sure it clicks a couple times. Clear the code and you're good.

  6. #6
    Member egod's Avatar
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    Navy Blue Metallic
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    okay yeah ill try that too

  7. #7
    Senior Member 01ws6er's Avatar
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    I have the same code, and my evap canister is cracked...I have a new one on the way, but how the hell do you get it off of the hose that connects it to the intake? There's a little white clip that Is a real PIA to get off!

  8. #8
    Member Goldcuffs's Avatar
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    The clip is not supposed to come off. Push on the clip in and pull the line at the same time.

  9. #9
    Senior Member 01ws6er's Avatar
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    Quote Originally Posted by Goldcuffs View Post
    The clip is not supposed to come off. Push on the clip in and pull the line at the same time.
    No wonder I was having such a hard time haha Thanks.

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