Car Problem Reports

Buick LaCrosse Check Engine Light Due to Gas Cap Issue

Buick LaCrosse Problem
24 Reports
Me Too

Model Years Affected: 2005, 2006, 2007, 2008, 2009, 2010

Average Mileage: 50,766 mi (10,200 mi - 80,000 mi)


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

  •  Rookie

    Check engine light stayed on. Remote diagnostic (Onstar)indicated that problem was with the gas cap. Took car to dealer, told them and they replaced the cap. Problem resolved.

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  • Visitor, , 80,000 mi

    Check gas cap light keeps coming on intermittently and now check engine light on. Replaced gas cap
    and okay for awhile. Both engine light and check gas cap light went off. Now, back on again.
    First check gas cap (which I did) and now engine light.

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  • Visitor, , 22,098 mi

    gas cap light cap looks ok then engine check light guess I should of bought a donkey

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  • Visitor, , 52,000 mi

    I have selected "me too" to 3 other common problems with the Lacrosse. I contacted buick for assistance on repairs and they said Garber Buick in Saginaw Michigan would only agree to $50 assistance on a $443 repair bill. How sad! But they had no problem taking bail out assistance from my tax paying money!!!!!!!!!!!!

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  •  Enthusiast

    We had this issue too. Mechanic found the problem.

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  • Visitor, , 37,000 mi

    Check engine light
    Leak in pressurized system
    Gas inlet defective
    Replaced $77 at dealer

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  • Visitor, , 73,000 mi

    Check engine light is on and the dash reads "Tighten Gas Cap" . I've tightened the gas cap several times I'm taking the car to the dealer tomorrow.

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  • Visitor, , 60,000 mi

    Replaced gas cap. Problem returned again, 3000 miles later

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  • my b
    LaCross has done this since day one I have had it back in a dozon times and was told that sensors are to senitive. this is from dealer!

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  • Visitor, , 55,000 mi

    Check engine light and loose gas cap information came on at same time - but cap was tight. Dealer had better price on cap than parts stores. Issue solved.

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