Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Car Problem Reports
Chevrolet Silverado 1500 HD Check Engine Light Due to Gas Cap Issue
Chevrolet Silverado 1500 HD Problem
11 Reports
Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007
Average Mileage: 101,368 mi (65,473 mi - 150,000 mi)
Verified
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Visitor, 2006 Chevrolet Silverado 1500 HD, 120,000 mi
check engine light came on - no other problems - computer message was to tighten gas cap
New gas cap - no check engine lightFlag ThisLike | 1 person likes this1 -
Visitor, 2006 Chevrolet Silverado 1500 HD, 65,473 mi
Check engine light due to gas cap issue
Flag ThisLike | 1 person likes this1 -
Visitor, 2003 Chevrolet Silverado 1500 HD, 70,000 mi
Dealer wanted $400 for some emission valve. New gas cap solved the problem!
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