Question about 2004 Pontiac Grand Am

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Service engine light

My daughter did not put gas cap on right, 2004 grand am. How do I reset the service light?

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  • wally5340 Dec 25, 2008

    Thank you. I will try it tomorrow.



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You will have to have it reset with a scan tool. Disconnecting the battery won't do it anymore. Go over to a parts store that has a scan tool and ask them to scan it for you and tell them to clear the code. It probably set a fuel evaporative leak large code. 

Posted on Dec 25, 2008

  • John Weathers
    John Weathers Dec 25, 2008

    If you are in the Austin TX area I would be more than happy to scan and reset it for you for free. If my reply helped please give it a rating.



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If the light is still on with the engine running, the problem has not been resolved. The computer is still seeing the problem. Had the gas cap fixed it, it would have turned off the light and kept the trouble code stored in memory.
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hi, this is just a reset issue. sometimes the CPU can become confused. the original warning that informed you about your gas cap is still in the cpu's memory. you will have to reset the cpu and, this will clear the warning. After the reset, it will stay off. chevy cpu's tend to do this from time to time.

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