Check Engine Light Due to Gas Cap Issue on Hummer H3

Problem Description and Possible Solution

A Loose or worn gas cap may cause Check Engine Light to illuminate.

Problem Data
RepairPal Verified
Average mileage: 83,443 (34,500–126,108)
5 model years affected: 2006, 2007, 2008, 2009, more2010
54 people reported this problem
Viewing 1 - 19 of 19 comments
Engine Light will not go off. It will read fuel cap every now & then. We have tighten the fuel cap and the light is still on. Not sure what to do. It is out of warrenty and I have no money
Fuel cap light came on 4 days after gettng gas. Tightened cap and then check engine light came on. Tightened cap again and light will not go off.
Driver information says gas cap loose and check engine light is on.
Autozone checker says evaporative system or gas cap.
Same issue, bought a replacement gas cap didn't fix it. I would notice the gas cap would get loose after driving a couple times. Replaced with a new factory cap from chevrolet.
The gas cap strap got wrapped under the cap after refueling causing the cap not to seal properly. This caused the check engine light to come on until the gas cap was sealed properly.
Engine light on, fuel cap light comes on after five miles of driving. Plug-in testing reveals unidentified vacuum leak. New cap for 30 bucks does not restore the loss of faith in a part that should last longer than five years.
Just had a new transmission put in. Now I have engine light coming on my mechanic says he is going to change gas cap that could be problem
I got in the car today and noticed the engine light on. Car is running good. Put gas in this morning. Light came on once and said gas cap and then went out. However the engine light remains on.
the engine light is on and i change the oxygen sensor and the evarp and gas cap and is still on but didnt change the one from the gas tank
Check engine light will randomly come on...not just after filling up. Eventually goes off. Took to shop and they said it was the gas cap. They messed with cap and light went off. About an hour later the light comes on again. Grrr.
Engine Light comes on...Disconnected battery to reset computer..goes off for a while 2 weeks, then returns, gas cap light comes on intermittently. Will replace gas cap and see what happens.