A Loose or worn gas cap may cause Check Engine Light to illuminate.
Car problem reports
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Most reported 2006 Hummer H3 problems
The fuel level sensor in the fuel tank may fail causing erratic fuel gauge operation. Our technicians tell us that on high mileage vehicles you may wish to replace the complete fuel pump module assembly if this condition occurs.
I was in Death Valley, CA off roading. Nothing too major. The second day we were traveling down a gravel road when BANG! The side airbags on both sides of the car deployed. I have it in the shop right now and awaiting response.