Car Problem Reports

Hummer H3 Check Engine Light Due to Gas Cap Issue

Hummer H3 Problem
34 Reports
Me Too

Model Years Affected: 2006, 2007, 2008, 2009, 2010

Average Mileage: 79,256 mi (34,500 mi - 120,000 mi)


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

  • Visitor, , 62,000 mi

    Engine Light will not go off. It will read fuel cap every now & then. We have tighten the fuel cap and the light is still on. Not sure what to do. It is out of warrenty and I have no money

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  • Visitor,

    my check engine light came on with fuel cap loose light

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  • Visitor, , 70,000 mi

    Same issue, bought a replacement gas cap didn't fix it. I would notice the gas cap would get loose after driving a couple times. Replaced with a new factory cap from chevrolet.

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  •  Rookie

    Engine light on, fuel cap light comes on after five miles of driving. Plug-in testing reveals unidentified vacuum leak. New cap for 30 bucks does not restore the loss of faith in a part that should last longer than five years.

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  • Visitor, , 58,000 mi

    Check engine light is always on and my dash blinks fuel cap

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  • Visitor, , 113,000 mi

    Check engine light comes on alot. Tighten gas cap and goes off in two days. Not fixed

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  • Visitor, , 58,200 mi

    Driver information says gas cap loose and check engine light is on.
    Autozone checker says evaporative system or gas cap.

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  • Visitor, , 34,500 mi

    The gas cap strap got wrapped under the cap after refueling causing the cap not to seal properly. This caused the check engine light to come on until the gas cap was sealed properly.

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  • ace35, , 65,000 mi

    Engine Light comes on...Disconnected battery to reset computer..goes off for a while 2 weeks, then returns, gas cap light comes on intermittently. Will replace gas cap and see what happens.

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  • Visitor, , 94,333 mi

    engine light keeps comming on ,change gas cap worked for 3 days back on again

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