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Hummer H2 Reliability and Common Problems

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If you’re looking for a large SUV that’s built tough, you can’t go wrong with a Hummer H2. It’s best known for its excellent off-road capability, superb engine performance, and distinct design. If you’re planning to buy a used Hummer H2, it’s a good idea to read up on its reliability ratings and research the common issues it may develop as it racks up mileage.

Is a Hummer H2 Reliable?

The Hummer H2 has a good reputation in terms of reliability. Kelley Blue Book gave the 2005 model a 4.7 reliability score based on consumer reviews, while J.D. Power gave the 2009 model a score of 3 out of 5.

Hummers are built for rough terrains and extreme weather conditions. As long as you follow your regular maintenance schedule and replace faulty parts immediately, your H2 can run for 300,000 to 500,000 miles without needing any major repairs.

Hummer H2 Common Problems

No matter how tough your Hummer is, it is bound to need some repairs as it gets older. Here are some of the issues your H2 may develop over time:

Mode Door Actuator Failure

Mode door actuator failure is a widely reported issue for 2003-2009 Hummer H2s. If left unresolved, it can cause improper HVAC (heating, ventilation, air conditioning) temperature and air delivery. Many owners of the affected units had to spend around $50 to $70 on diagnosis alone to address the problem.

Gas Cap Issues

A loose or worn gas cap is a common complaint for the 2003-2009 model years. The check engine light usually illuminates to mark this issue.

However, a gas cap problem is not the only issue that can activate the check engine light. So if you encounter this symptom, it’s best to take your vehicle to your mechanic for proper diagnosis. Here’s a guide on how to tell if your gas cap is the one triggering your H2’s check engine light.

Low Oil Pressure

2005 2007 Hummer H2 from Wikimedia
Some 2006 Hummer H2 owners have reported loud knocking sounds along with coolant loss. Image source: Wikimedia.

Problems with oil pressure were among the top complaints for the 2006 model year. Repairs for this type of problem can reach up to $7,000.

Many 2006 Hummer H2 owners reported loud knocking sounds along with coolant loss. Most of them replaced their oil pump to solve the issue, but, in most cases, the problem persisted. Some drivers unfortunately had to get their engine replaced in order to fix the issue.

Engine Stalling

Some 2003-2006 Hummer H2 owners have complained that their SUV is prone to engine stalling and low idle speed. Servicing the throttle body usually corrected the issue. Throttle body cleaning usually costs anywhere between $230 to $290.

If you encounter this problem with your Hummer, note that many underlying issues can cause your H2 to stall. So it’s best to take your vehicle to an auto repair shop for proper diagnosis.

Steering Wheel Position Sensor Failure

A steering wheel position sensor that failed after around 58,000 miles is another common complaint among many H2 owners. A service stability message usually accompanies this issue.

The steering wheel position sensor or steering angle sensor (SAS) plays a crucial role in ensuring predictable steering. If it’s faulty or worn out, it can cause problems like loss of steering control. Fortunately, there’s no shortage of aftermarket steering wheel position sensors available today, so you can easily order one for your H2 if you encounter this issue.

Faulty Turn Signal Switch

Several owners of 2003-2006 H2s have complained about hearing clicking noises coming from their vehicle’s turn signal flasher when the turn signals are switched off. Upon inspection, mechanics found a fault in the turn signal switch.

Fortunately, replacing the faulty switch usually resolves this problem. Parts may cost you anywhere between $40 and $120. Labor costs may set you back by another $80 to $100.

Restricted Secondary Air Injection Valve

2006 Hummer H2 Wikimedia
Some 2003-2006 Hummer H2s can develop faults in their air injection valves. Image source: Wikimedia.

Some 2003-2006 Hummer H2s can develop faults in their air injection valves. The secondary air injection valves on these vehicles may be restricted, resulting in poor air flow.

An illuminated check engine light is usually the first sign that there’s something wrong with these valves. Mechanics recommend replacing both valves at the same time, even if only one valve is faulty.

Fuel Level Sensor Failure

Several 2003-2004 Hummer H2 owners have also complained about fuel level sensor malfunction. Their faulty sensor recorded incorrect fuel tank level readings, resulting in erratic fuel gauge behavior. Most of them noticed that their gauge read “full” then “empty” again in a short span of time. Some drivers also noticed changes in their usual gas mileage.

These are only some of the issues your Hummer may develop as it puts on the years. By doing your research and carefully inspecting the vehicle you intend to purchase, getting this SUV should come with little risk. More importantly, you can maximize your Hummer’s service life by following its maintenance schedule and replacing faulty or worn-out parts immediately.

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Vehicle Reliability

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