Car Problem Reports

Pontiac Grand Prix Check Engine Light Due to Gas Cap Issue

Pontiac Grand Prix Problem
68 Reports
Me Too

Model Years Affected: 1996, 2004, 2005, 2006, 2007, 2008

Average Mileage: 119,818 mi (28,000 mi - 210,000 mi)


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

  • check engine light is on. I get a message to check gas cap. I replaced the gas cap but am still getting the same message.

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  • Visitor, , 102,000 mi

    i had 2 codes one catilac converter had that repaired po455 code had that checked smoke test found no leak went to gm dealer got new gas cap how long does it take before check engine light goes off

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  • Why does the information center ( where the day and date, odometer etc. are displayed ) in my 2006 Pontiac Grand Prix V6 3.8 liter always say check gas cap? When I fill up my gas tank I always make sure to click my gas cap three times to make sure it's closed. And by the next day my information center will say check gas cap and when I do, sure enough it is loose. I bought another gas cap (kind of a generic one) and it still does the same thing. I went to a Pontiac dealer and asked them and they had no idea. they told me to replace the gas cap. So once again I bought another gas cap that I purchased from the Pontiac dealer that is exactly the same as my original gas cap. And again my car keeps saying check gas cap! I've search the web and find nothing to help me with this problem.

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  • Visitor, , 86,000 mi

    Check gas cap indicator keeps coming up. Checked the cap several times, then replaced the cap. Still comes on.....

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  • Ive had this problem continuously for pretty much the lifetime of the car and I bought it new. Replacing the gas cap has not solved the problem.

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  • Changed Gas Cap still has indicator light for check gas cap

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  • Profile_thumbnail

    New gas cap did not fix the problem. Throwing code P0455 - EVAP system leak (large) - customer had to take car on trip and will drop it back off when they return.

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  • Check engine light came on. Problem was corrected by installation of a new gas cap and gas line filter.

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  •  Rookie

    car indicated gas cap failure on service screen - replaced cap and warning cleared itself.

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  • Visitor, , 210,000 mi

    Light in car indicated gas cap loose replaced gas cap still not fixed issue.

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