Check Engine Light Due to Gas Cap Issue on GMC Jimmy

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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Average mileage: 166,786 (109,000–220,000)
6 model years affected: 1996, 1997, 1998, 1999, more2000, 2001
13 people reported this problem
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Viewing 1 - 3 of 3 problem details
Whenever I get gas, I tighten it to about 5-6 clicks, the check engine light comes on. I have had this checked and its my gas cap. I need to get another one to see if this stops the light from coming on. I can't get my vehicle inspected with this light on. But I am sure getting a new cap will fix this problem.
2001 GMC Jimmy 160,333 mi,
Error code p0997 p0994 twice said something bout faulty cylinder head ground wire
Was I embarrassed!!!! Check engine lite came on and I panicked thinking something major had gone wrong. Made appointment at dealer to fix my problem. They took it into service and 2 minutes later they delivered it back to me. I didn't tighten the gas cap enough which caused the lite to go on. I wanted to crawl under a rock but grateful lite meant no problems.