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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.

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8
Known Problems

The steering wheel position sensor may fail, resulting in the service stability message being displayed.

Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.

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.

The EVAP canister vent valve or valve solenoid wiring may fail causing illumination of the check engine light, setting code P0446, and problems filling the tank with fuel.

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:

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.

Our technicians recommend flushing the brake fluid every 60,000 miles.  Brake fluid that is dirty may cause problems in the brake system.

Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.

The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time