Question about 1998 Cadillac DeVille

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Check gas cap light comes on, i clear the code but comes back every 50 to 75 miles

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  • joebahbah Mar 02, 2009

    then gas should leak out during fill ups, no gas leaks out when i fill it

  • joebahbah Mar 02, 2009

    then gas should leak out during fill ups, no gas leaks out when i fill it

  • joebahbah Mar 05, 2009

    so i should buy a new gas cap

  • Anonymous Apr 05, 2009

    after we filled up the tank on our 98 cadillac deville. we parked it in our drive way that was on a small incline. we descovered that it leaked out some gas. but when we moved it to level ground no leak,

  • Dave Real
    Dave Real May 11, 2010

    Just leaking fuel vapor can turn the light on. Your vehicle's computer runs a test to check for vapor leaking, if it finds one the light comes on until you repair it.

  • Dave Real
    Dave Real May 11, 2010

    What is the code that comes up? If it is a PO442, there are other reasons the light comes on, leaks in other evap hoses are common.



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Yes, I think it is worth a try.

Posted on Mar 05, 2009

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I bet you have a rust hole in the fill tube going to the gas tank.

Posted on Mar 02, 2009


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Posted on Jan 02, 2017

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SOURCE: replaced gas cap on '05 cadillac keep getting check gas cap message

May be a evap system leak.

Posted on Mar 20, 2013

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code P1456 set when there's small leak in the fuel tank system.
Most known reason for P1456:
-Didn't tight fuel cap on until it click for more that 3 time after fueling up and drove the car too long with cap loose.
-or a bad gas cap.
I'll try tighting the gas cap.
clear check engine.
if code come back, replace gas cap and clear check engine light again.

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