Check Engine Light Due to Gas Cap Issue on Chevrolet Impala

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

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Average mileage: 150,851 (100,000–181,000)
3 model years affected: 2004, 2005, 2010
12 people reported this problem
4 people shared problem details
have replaced the gas cap 3 x at different intervals so far.
1 person likes thisFlag inappropiate
check engine light came on. got a new gas cap..but check engine light came back on. car idles high when i hit 30mph and i have to keep stepping on the gas until it jolts and picks up
The gasket around inside cap had become hard and develop cracks allowing pressurize air to leak out causing the check engine light to turn on. the code P0442 was reported "small leak detected"
2004 Chevrolet Impala150,000
The gas cap was loose and wouldn't tighten, causing it to fail inspection.
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