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

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

RepairPal Verified
Average mileage: 145,500 (112,000–179,000)
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
8 people reported this problem
1 person shared problem details
2003 GMC Sierra 2500179,000
Emmisiions light on for months, was told to live with it, I brought it in for other work and they replaced the gas cap...light is off....hmmm go figure.
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