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
16 people reported this problem
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problem details
2006 GMC Sierra Denali 110,000 mi,
check engine light comes on. tighten gas cap and goes off for awhile. replaced gas cap but still happens.
2005 GMC Sierra Denali 93,254 mi,
I get message saying to tighten gas cap, but continue to have the problem.