Check Engine Light Due to Gas Cap Issue on GMC Sierra Denali

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

RepairPal Verified
Average mileage: 100,950 (80,000–135,000)
8 model years affected: 2002, 2003, 2004, 2005, more2006, 2008, 2009, 2010
15 people reported this problem
2 people shared problem details
check engine light comes on. tighten gas cap and goes off for awhile. replaced gas cap but still happens.
I get message saying to tighten gas cap, but continue to have the problem.
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