Car Problem Reports

GMC Yukon Denali Check Engine Light Due to Gas Cap Issue

GMC Yukon Denali Problem
21 Reports
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Model Years Affected: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2008

Average Mileage: 87,014 mi (45,000 mi - 150,000 mi)


A Loose or worn gas cap may cause Check Engine Light to illuminate.

  •  Rookie

    check engine light came on and message appeared that the gas cap needed to be tightened. had diagnosised to determind gas cap was no longer sealing properly- replaced gas cap, but check engine light still on

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  • Visitor, , 70,000 mi

    Engine light due to gas cap

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  • Visitor, , 80,320 mi

    check engine light

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  • Visitor, , 50,000 mi

    Worn gas cap causes check engin light to come on. Only the $25 GM cap works to fix the problem.

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  • Visitor, , 150,000 mi

    Gas cap sensor triggers check engine light. Despite replacing gas cap at the dealership the light goes back on.

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  • Visitor, , 145,000 mi

    MIL light comes on right after I fill gas tank and drive at speeds over 70 MPH. New O2 sensors, New air filter, new spark plugs, new plug wires, and I still get a P300 trouble code. (Random multiple mis fires). No help from Dealership other than an offer to TRADE IN TO buy "THE NEWEST CROWN JEWEL". Well, BS to that...

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  • Visitor, , 69,851 mi

    I got a message on dash telling me to tighten the gas cap. I thought this was strange sine I hadn't gotten gas for about a week. Anyway, I tightened it for chuckles. Next day, I got the same message and did the same thing. Then I got the indicator light for the gas. I called on-star to do a diagnostic system check. They said tighten the gas cap and if the problem persists, go to the dealership for service.

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  •  Rookie

    1)"Tighten loose gas cap" warning message came up twice in the message display.
    2)"Engine light" illuminated on the dash cluster.
    3) Gas cap WAS loose, re-seated & tightened cap - haven't replaced, yet. Will recheck this PM.

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  • Visitor, , 89,000 mi

    I have an 08 denali with the WORST gas cap. It is very hard to get it to seat flush. I constantly get the check engine light because it doesn't create a seal when it's on.

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  • Visitor, , 51,000 mi

    Check engine came on. Onstar said it was not a serious problem. I replaced my gas cap with a new one and after several days, the light went away. Onstar said no proplems.

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