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Hummer H2 Car Problems

Check Engine Light Due to Gas Cap Issue on Hummer H2

Problem Description and Solution

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

(28 people reported this problem)

Problem Data

RepairPal Verified
Average mileage: 78,069,785 (12,400–780,000,000)
7 model years affected: 2003, 2004, 2005, 2006, more2007, 2008, 2009

Not Your Hummer H2 Problem?

Brake problem? Or maybe a faulty head gasket cylinder?
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Viewing 1-8 of 8 comments
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.
Check engine light went on after awhile and not only was realized that putting in gas and attendant did not seal correcty.
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.
Okay so im going to lunch and when i first start the car the check engine light goses on please help what should i do
And i forgot how much miles it has
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 !
this is a very common problem replaced 2 gas caps due to engine light also 2 times on my 2500 series