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P0440

This is a discussion on P0440 within the General Help forums, part of the LSx Technical Help Section category; showed up today on my buick, some kind of EVAP code, says something is up with my fuel pressure. My ...

  1. #1
    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
    2000 SS Black M6

    P0440

    showed up today on my buick,

    some kind of EVAP code, says something is up with my fuel pressure. My first thought was to pop the schrader valve to relieve it, but I haven't done it yet.

    Online it said something about an EVAP canister getting clogged?

    Just wondering what you guys thought about it

  2. #2
    Senior Member Too Fast's Avatar
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    Black
    2000 WS6 6spd Hooker LT

    Can't remember off the top of my head, but I believe the 440 code is a gross evap leak.

    First thing to check is your gas cap. If it's loose/off, it will set the gross leak code pretty quickly.

  3. #3
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    check your cap and the lines to your evap canister.

  4. #4
    Your dealership guy konigandy6's Avatar
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    Velocity Yellow
    2008 Corvette Z06

    fuel vapor leak... check gas cap and vent valve.

  5. #5
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    p0440 is the famous gas cap code. Could also be other things but usually loose gas cap. tighten it down and clear the code

  6. #6
    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
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    ok cool, will do....and i have no idea where this evap canister is located, lol

  7. #7
    Veteran 0rion's Avatar
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    06 duramax

    usually in the rear of the car somewhere near the tank. On the f-bodies it's behind the drivers side rear tire between the fill nozzle and tail light assembly.
    Get under there and follow the vacuum line coming out of the tank and it'll take you right to it.

  8. #8
    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
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    sweet thanks, I would have been looking under the hood, lol

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