Check Engine Light Due to Gas Cap Issue on Hummer H3

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

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Average mileage: 81,420 (34,500–126,108)
5 model years affected: 2006, 2007, 2008, 2009, more2010
38 people reported this problem
16 people shared problem details
2006 Hummer H362,000
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
my check engine light came on with fuel cap loose light
2006 Hummer H334,500
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.
2007 Hummer H370,000
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.
2006 Hummer H380,600
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.
2008 Hummer H358,200
Driver information says gas cap loose and check engine light is on. Autozone checker says evaporative system or gas cap.
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.
2006 Hummer H394,333
engine light keeps comming on ,change gas cap worked for 3 days back on again
Same problem! How do I fix it?
2007 Hummer H358,000
Check engine light is always on and my dash blinks fuel cap
2006 Hummer H3113,000
Check engine light comes on alot. Tighten gas cap and goes off in two days. Not fixed
2007 Hummer H3126,108
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
2006 Hummer H380,000
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.
2007 Hummer H375,000
Same issue....check engine light comes on over gas cap
fuel light comes on at random times i have to constantly get out take it off and put it back on again
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If this continues come April I won't be able to pass inspection...PLEASE HELP
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Check engine light comes on for a short time and goes off. This happens at random.
We'll, I don't know how to describe the shake. All I know is that the car shakes to the point...

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