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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  • 103 Answers

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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Disconnect the positive battery post connection, wait 15 minutes and reconnect...Are you sure the problem was fixed that caused it to come on? Also, recheck 3 clicks on gas cap...

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

I just helped a friend fix his truck that did everything you have stated. (However his was a Toyota)

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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.

I have tried to replace the O ring on a cap before, but found it nearly impossible. Another trick would is to lightly coat the O ring with vasoline - then seven trips to see if that clears the light. This is only a temporary solution, but it may tell you if the problem is the gas cap. Godd luck!

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If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

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