A Loose or worn gas cap may cause Check Engine Light to illuminate.Google+
Car Problem Reports
GMC Jimmy Check Engine Light Due to Gas Cap Issue
GMC Jimmy Problem
Average Mileage: 128,200 mi (109,000 mi - 150,000 mi)
Visitor, 2000 GMC Jimmy, 150,000 mi
Check engine light keeps coming on.I tighten up the cap it goes off I drive a couple days it comes back on a the cap is loose. I purchased a cap at auto zone same problem.If I get the $ 30.00 cap from the dealer will it stop?
Whenever I get gas, I tighten it to about 5-6 clicks, the check engine light comes on. I have had this checked and its my gas cap. I need to get another one to see if this stops the light from coming on. I can't get my vehicle inspected with this light on. But I am sure getting a new cap will fix this problem.