Car Problem Reports

Cadillac DeVille Check Engine Light Due to Gas Cap Issue

Cadillac DeVille Problem
40 Reports
Me Too

Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005

Average Mileage: 100,158 mi (25,500 mi - 194,000 mi)


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

  • , , 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.

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  • , , 75,000 mi

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

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  • , , 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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  • , , 110,000 mi

    I have replaced the gas cap twice without eliminating the problem

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  • , , 100,000 mi

    Not fixed, needs new gas cap, needs so much stuff, this is small.

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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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  • , , 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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  • appears that after it rains the Check Gas Cap sensor goes on..
    Thinking it's a Sensor issue

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  • , , 145,000 mi

    I replaced the gas cap and it is still and issues. I suspect there is a vacuum leak somewhere around the gas tank.

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  • , , 104,000 mi

    Tightened gas cap and the light eventually went off.

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