Check Engine Light Due to Gas Cap Issue on GMC Sierra 2500 HD

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

RepairPal Verified
Average mileage: 106,000 (92,000–120,000)
Exhaust & Emissions affected: Gasoline
6 model years affected: 2001, 2002, 2003, 2004, more2005, 2006
8 people reported this problem
1 person shared problem details
Worn gas cap, check engine light illuminates and does not resolve itself until cap re-set and several (10ish) run cycles.
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