Sierra 2500 HD

Check Engine Light Due to Gas Cap Issue on GMC Sierra 2500 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: 146,603 (92,000–200,000)
Exhaust & Emissions affected: Gasoline
9 model years affected: 2001, 2002, 2003, 2004, more2005, 2006, 2008, 2009, 2010
14 people reported this problem
Viewing 1 - 3 of 3 comments
Cel illuminates about once a week typically shortly after dic recommends "tighten gas cap"!!
Won't take gas at pump correctly. Very slow fill up. Not resolved yet
Worn gas cap, check engine light illuminates and does not resolve itself until cap re-set and several (10ish) run cycles.