2008 Hummer H2 Problems
RepairPal has identified the most common problems with the 2008 Hummer H2 based on complaints from actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The 2004-2009 Hummer H2 is known to have issues with the EVAP system, a part of your emission control system.
To correct the issue, the EVAP canister vent valve, solenoid, and wiring must be inspected. The most common fix is replacement of the wiring connector or replacement of the vent valve assembly.
The Hummer H2 uses a throttle position sensor (TPS) which commonly fails and causes the following issues:
- Check engine light illumination
- Reduced Power message
- OBD trouble code P2135
This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS.
To correct this issue, the wiring harness, connector, and throttle position sensor must be inspected, tested, and/or replaced. The most common cause is a faulty TPS.
The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time
The steering wheel position sensor may fail, resulting in the service stability message being displayed.