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
The nation’s largest network of independent repair shops certified for expert training, quality work and fair pricing
problem details
2003 GMC Sierra 2500 179,000 mi,
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.