Question about 2003 Chevrolet Avalanche

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My check engine light won't go off. on star said it was my gas cap which i have fixed but the light still stays on. wanted to know how to reset the computer on my 2007 avalanche.

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  • lenscap3 May 14, 2009

    Thanks, I'll try it out,



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You can somewhat do it yourself by disconnecting the battery and leaving it of for about a day. Faster way is take the battery out of the car and connect the positive and negative cables from the vehicle together (NO POWER ATTATCHED TO THEM) and wait for about and hour or two. Otherwise a mechanic can reset it for you.

Posted on May 14, 2009


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I know this sounds unrelated but, reset the light and tighten down the gas cap, or buy another gas cap.

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I don't know the age of your car, but it is likely the O ring on the gas cap is leaking, not allowing the fuel system to work properly. If you forgot to put on the gas cap or did not tighten it, after seven runs, the check engine light should clear. If it does not, then the easiest solution is to buy a new gas cap from the dealer. It will be about $25 - $30, and you can install it yourself. After installing the new cap, and seven trips later, IF the gas cap was the problem, the light should clear.

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