Car Problem Reports

Cadillac DeVille Check Engine Light Due to Gas Cap Issue

 
Cadillac DeVille Problem
26 Reports
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Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005

Average Mileage: 103,536 mi (60,000 mi - 194,000 mi)

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Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

  • Visitor, , 60,000 mi

    Code came up with very small vacuum leak in evaporator system or also Check Gas Cap. I originally fixed the problem by dabbing a small amount of grease on the rim of the gas filler neck. But after a year or so I finally figured out the problem. The gas cap is a poor design. I tore apart the gas cap and found out the seal that is really a like a rubber grommet does not contact the rim of the filler neck properly. I took a piece of single strand copper wire and wrapped it around the back side of the seal (side closest to the handle of the cap) forcing the seal closer to the rim side of the filler neck. Problem solved.
    RRH

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  • Visitor, , 75,000 mi

    Dealer wanted $79.50 for a new cap. Autozone $12.00

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  •  Rookie

    Service engine light on and evap code. Both (99,400 and 14,300)times resolved with new cap. Seems like cap should last longer.

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  • Visitor, , 194,000 mi

    check gas cap comes on on the dash replaced cap 3 times still comes on have reset computer everytime

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  • Visitor, , 125,000 mi

    I got the warning. I took the gas cap off, cleaned it and applied some light silicon lubricant and the problem hasn't come back in a couple of years now. I did NOT replace the cap... just cleaned it.

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  • Visitor, , 110,000 mi

    had to buy new fuel cap. then had to wait two days for sensor to register the new fuel had been installed before light went off.

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  • Visitor, , 110,000 mi

    I have replaced the gas cap twice without eliminating the problem

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  • Visitor, , 75,000 mi

    replaced cap multiple times from dealer. finally they must have felt sorry for me and told me to clean the cap really well...toothbrush & water...dry well with lint free cloth. It worked!!! have to do about every six months as error codes starts again. Still doing @ 102,000 miles...looks like they would have fixed this by now!!!!!

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  • Visitor, , 88,353 mi

    Check Gas Cap displayed on 'info'. Tried tightening cap several times, light came back as soon as I started the engine. Saw on another forum that the cap may need replacing...will attempt that as the first option.

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  •  Rookie

    Replaced cap.

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