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: 80,793 (34,500–126,108)
5 model years affected: 2006, 2007, 2008, 2009, more2010
40 people reported this problem
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Viewing 1 - 17 of 17 problem details
2006 Hummer H3 62,000 mi,
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
2006 Hummer H3 80,600 mi,
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.
Same problem! How do I fix it?
my check engine light came on with fuel cap loose light
2008 Hummer H3 58,200 mi,
Driver information says gas cap loose and check engine light is on. Autozone checker says evaporative system or gas cap.
2006 Hummer H3 34,500 mi,
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 H3 58,000 mi,
Check engine light is always on and my dash blinks fuel cap
2007 Hummer H3 70,000 mi,
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.
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.
2007 Hummer H3 67,000 mi,
When gas is filled light doesn't come on but as the gas level drops, the level comes on.
2006 Hummer H3 94,333 mi,
engine light keeps comming on ,change gas cap worked for 3 days back on again
2006 Hummer H3 113,000 mi,
Check engine light comes on alot. Tighten gas cap and goes off in two days. Not fixed
2007 Hummer H3 126,108 mi,
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 H3 80,000 mi,
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,..now gas cap light comes on intermittently. Will replace gas cap and see what happens.
2007 Hummer H3 75,000 mi,
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