Check Engine Light Due to Gas Cap Issue on GMC Sierra 3500

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 52,482 (52,482–52,482)
Exhaust & Emissions affected: Gasoline
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
9 people reported this problem
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check engine light on- fixed- on again- cannot fill tank- fixed, same issues