Check Engine Light Due to Gas Cap Issue on Chevrolet Monte Carlo

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 115,000 (110,000–120,000)
3 model years affected: 1996, 1997, 2001
5 people reported this problem
2 people shared problem details
check engine light on for 2 years...changed gas cap 2 times..didnt fix issue
If gas cap is not screwed back on tightly after getting gas, engine light comes on. After screwing on correctly and driving a while the light will go off. Can take a day or two for light to go off, unless a lot of driving is done.
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