P440 Code
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Cadillac Seville / Cadillac Eldorado Forum Discussion, P440 Code in Past Cadillac Vehicle Discussion; My service engine soon light came on and after checking codes I have a P 440 (current). Indicates a small ...
  1. #1
    walterroc's Avatar
    walterroc is offline Cadillac Owners Member
    Automobile(s): 1998 Eldorado
    Join Date
    Apr 2005
    Location
    Hopedale, MA
    Age
    71
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    73

    P440 Code

    My service engine soon light came on and after checking codes I have a P 440 (current). Indicates a small leak. Anyone have any ideas where to start.


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  3. #2
    FrankT's Avatar
    FrankT is offline Cadillac Owners Enthusiast
    Automobile(s): 99 STS
    Join Date
    Mar 2004
    Location
    Michigan
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    CoolRe: P440 Code

    Quote Originally Posted by walterroc
    My service engine soon light came on and after checking codes I have a P 440 (current). Indicates a small leak. Anyone have any ideas where to start.
    Walterroc,
    I have the same DTC setting on my 99 STS, start with the gas cap, inspect for a cut rubber seal or take a gamble and replace the gas cap. The second thing to check is for a sticking evaporative canister vent valve or a poor connection in the evaporative emission system. I tried a gas cap on mine it did not fix it I have to in deeper. I could also be a leak anywhere in the Evaporative Emission System. This requires a smoke machine to locate the leak.
    Good Luck
    Frank

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