Check Engine Light Due to Gas Cap Issue on Hummer H2

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

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Average mileage: 91,064 (30,000–124,000)
4 model years affected: 2003, 2004, 2005, 2006 more
13 people reported this problem
6 people shared problem details
2006 Hummer H270,450
Tighten feul cap warning.. replaced cap. Lasted 4 days then started again and now I have an engine light on.. gotta take it in to have it checked.
1 person likes thisFlag inappropiate
2003 Hummer H2120,000
shop said to get a new gas cap. mine cap cover just snaped off one day. so i got out the super glue. but now the cap will not click when i try to tighten it. so know i will buy a new one.
1 person likes thisFlag inappropiate
2003 Hummer H2102,000
Check engine light went on after awhile and not only was realized that putting in gas and attendant did not seal correcty.
1 person likes thisFlag inappropiate
2005 Hummer H287,000
still does it...and dealer won't fix
2004 Hummer H2104,000
the service garage said it was rust on filler neck ,they sanded it and it still happened. I discovered that the cap always felt loose and decided to replace it, in doing so , I found out that part of the rubber on the cap was missing . I hope this fixes the problem !
2004 Hummer H2124,000
this is a very common problem replaced 2 gas caps due to engine light also 2 times on my 2500 series
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