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Hummer H3 Problems

Find the most common issues based on Hummer H3 owner complaints.
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Most Common Hummer H3 Problems

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
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 ass...
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0 Known Hummer H3 Brakes Problems

1 Known Hummer H3 Drive Train Problem

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

1 Known Hummer H3 Electrical & Lights Problem

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 ass...

2 Known Hummer H3 Engine Problems

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.
The Hummer H3 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 i...

1 Known Hummer H3 Exhaust & Emissions Problem

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

0 Known Hummer H3 Heating & Air Conditioning Problems

3 Known Hummer H3 Maintenance Problems

Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
GM recommends replacing the engine coolant at 100,000 miles; however, our technicians tell us that the coolant may become contaminated and require a complete cooling system flush every 60,000 to 70...
The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.

0 Known Hummer H3 Miscellaneous Problems

0 Known Hummer H3 Suspension & Steering Problems

10
Known Hummer H3 Problems & Complaints

The engine may develop a misfire due to worn valve seats. This fault will cause the Check Engine Light to illuminate. Replacement of the cylinder head may be required to correct this concern.
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
GM recommends replacing the engine coolant at 100,000 miles; however, our technicians tell us that the coolant may become contaminated and require a complete cooling system flush every 60,000 to 70...
The Hummer H3 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 i...
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 ass...
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.
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