Illumination of the Check Engine Light can be caused by a loose or worn gas cap.
Average mileage: 58,326 (11,000–105,653)
8 people reported this problem
my 2005 Colorado had a check engine light on with a gas cap I replaced gas cap light went off it may be someone took mine and put their bad one on ? oh the year above only went to 2002 guess they didn't think a truck that's only a 2005 should have a BAD cap on it the truck was a year old when I replaced the cap seems Government motors needs to use better products