Check Engine Light Due to Gas Cap Issue on Chevrolet Silverado 1500 HD

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

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Average mileage: 110,995 (64,500–196,000)
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
13 people reported this problem
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Viewing 1 - 4 of 4 problem details
check engine light came on - no other problems - computer message was to tighten gas cap New gas cap - no check engine light
Check engine light due to gas cap issue
Dealer wanted $400 for some emission valve. New gas cap solved the problem!
I'm not really sure what the problem is just yet, sometime the check engine light goes away, them will come on days later.