Check Engine Light Due to Gas Cap Issue on Hummer H2

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

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Average mileage: 77,538 (12,400–124,000)
7 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009
20 people reported this problem
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Viewing 1 - 7 of 7 problem details
2006 Hummer H2 70,450 mi,
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.
2003 Hummer H2 102,000 mi,
Check engine light went on after awhile and not only was realized that putting in gas and attendant did not seal correcty.
2003 Hummer H2 120,000 mi,
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.
2004 Hummer H2 48,000 mi,
Message comes on to Tighten Gas Cap, then engine light comes on.
2005 Hummer H2 87,000 mi,
still does it...and dealer won't fix
2004 Hummer H2 104,000 mi,
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 H2 124,000 mi,
this is a very common problem replaced 2 gas caps due to engine light also 2 times on my 2500 series