Check Engine Light Due to Gas Cap Issue on GMC Sierra 1500 HD

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: 87,600 (87,600–87,600)
7 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2007
11 people reported this problem