Check Engine Light Due to Gas Cap Issue on Chevrolet Avalanche

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

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Average mileage: 78,335 (10,000–130,000)
4 model years affected: 2007, 2008, 2009, 2010
21 people reported this problem
6 people shared problem details
this is a constant issue. we have even tried purchasing new gas caps but the issue still happens.
Check engine light code indicated a faulty gas cap and evap
gas cap loose wont tighten check engine light comes on
Replaced gas cap and light still stays on
Check engine light comes on. I get the code read and they tell me it's my gas cap. I've replaced the gas cap and it hasn't fixed the problem.
Back in December, I had my engine light go on. Had the problem checked and I was told that there is a loose or faulty gas cap. Have not replaced gas cap yet.
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