2002 GMC Envoy Q&A
2002 GMC Envoy Question: CHECK ENGINE LIGHT STAYS ON
The check engine light means that there's a failure somewhere in your emissions control system. RepairPal has some info on it: http://repairpal.com/check-engine-light Could be a number of things, and problems in emissions can change mileage. Normally, fuel economy gets worse, though. Best to have it diagnosed and fixed soon to avoid additional problems or damaged components. - matte
I had this problem a few years ago. Eventually i found out i had a gas tank leak. - Visitor
I've had this problem, had mechanics do a full inspection, and found nothing. When I had an emmission check, the mechanic indicated I had a seal problem with the gas cap - which would cause the check engine light. I have no other issues for years with the car...so I've concluded my gas cap on/off is the issue - Visitor
Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
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