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Common Faults Of The Hummer H2: Breakdowns, Problems And Solutions!

If you’re looking for a large SUV that’s built tough, you can’t go wrong with a Hummer H2. To help you, we have listed the common failures of the Hummer H2, in case you are interested in buying one.

It is best known for its excellent off-road capability, superb engine performance, and distinctive 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 common problems it can develop as you rack up mileage.

How good is the Hummer H2?

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

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

Common failures of the Hummer H2

No matter how rugged your Hummer is, it’s bound to need some repairs as it ages. Here are some of the common Hummer H2 faults that can develop over time:

1. Mode Door Actuator Failure

Mode door actuator failure is a widely reported problem for 2003-2009 Hummer H2s. If not resolved, it can cause improper HVAC (Heating, Ventilation, Air Conditioning) temperature and air delivery. Many owners of affected drives had to spend $50-$70 just on diagnostics to fix the problem.

2. Problems with the gas cap

A loose or worn gas cap is a common complaint for model years 2003-2009. The check engine light usually comes on to indicate this problem.

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

3. Problems with low oil pressure

Oil pressure problems were one of the top complaints in 2006. Repairs for this type of problem can run as high as $7,000.

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

4. Engine shutdown failure

Some 2003-2006 Hummer H2 owners have complained that their SUV is prone to stalling and low idle. Throttle body service usually corrects the problem . Throttle body cleaning typically costs $230-$290.

If you encounter this issue with your Hummer, be aware that many underlying issues can cause your H2 to shut down. So it is better to take your vehicle to an auto repair shop for a proper diagnosis.

5. Steering wheel position sensor failure

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

The steering wheel position sensor or steering angle sensor (SAS) plays a crucial role in ensuring predictable steering. If it is faulty or worn, it can cause problems such as loss of steering control . Fortunately, there is no shortage of steering wheel position sensors available today, so you can easily order one for your H2 if you run into this problem.

6. Turn signal switch problems

Several 2003-2006 H2 owners have complained that they hear clicking noises coming from their vehicle’s turn signal light when the turn signals are off. Upon inspection of the vehicle, the mechanics found a fault with the turn signal switch.

Fortunately, replacing the faulty switch usually solves this problem. Parts can cost you anywhere from $40 to $120. Labor costs can cost you another $80 to $100.

7. Problems with the secondary air injection valve

Some 2003-2006 Hummer H2s may develop faulty air injection valves. The secondary air injection valves on these vehicles may be restricted, resulting in poor airflow.

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

8. Fuel level sensor failure

Several 2003-2004 Hummer H2 owners have also complained about a malfunctioning fuel level sensor.

The faulty sensor was recording incorrect fuel tank level readings, causing erratic fuel gauge behavior. Most of them noticed that their gauge read “full” and then “empty” again within a short period of time. Some drivers also noticed changes in their usual mileage.

In summary

These are just a few of the common Hummer H2 faults that can develop as the years go by. If you carefully research and inspect the vehicle you intend to purchase, purchasing this SUV should pose little risk. Most importantly, you can maximize the life of your Hummer by following the maintenance schedule and promptly replacing defective or worn parts.

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