Check Engine Light Due to Gas Cap Issue on Chevrolet Avalanche 2500

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

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Average mileage: 91,926 (49,852–134,000)
5 model years affected: 2002, 2003, 2004, 2005, more2006
7 people reported this problem
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service light on got code po449 put on new gas cap what now