{Top 6 Fixes} Hummer H2, H3 Transmission Issues & Costs!

Last Updated on October 7, 2023 by Robert Wilson

The Hummer H3 is a midsize SUV that was produced from 2005 to 2010.

The H2 & H3 was offered with both manual and automatic transmissions.

However, many owners have reported having problems with the H2 and H3’s transmission, especially the automatic transmission.

One of the most common causes of transmission problems in the H2 or H3 is a faulty transmission filter.

The filter is responsible for keeping dirt and debris out of the transmission fluid, but over time it can become clogged and cause problems.

If your H2 and H3’s transmission isn’t shifting properly or seems to be slipping, it’s likely that the filter needs to be replaced.

Another potential cause of the H2 & H3’s transmission issues is a problem with the torque converter.

The torque converter is what helps to transfer power from the engine to the wheels, and if it isn’t working properly, it can cause all sorts of shifting problems.

Of course, there are other potential causes of transmission problems in the H2 and H3 (like low fluid levels or worn-out parts), but these are two of the most common ones.

If you are having trouble with any type of shifting issue with your H2 or H3, get to a mechanic so he can fix the issues causing it’s to work properly.

Hummer H2 & H3 Transmission Not Shifting

Here is some information that may help you troubleshoot the issue and get your both H2 and H3 Hummer back on the road.

The first thing to check is the transmission fluid level. If it is low, add more fluid and see if that fixes the problem.

If the fluid level is fine, then there are a few other things that could be causing the transmission to not shift properly.

One possibility is that there is an issue with one of the sensors in the transmission.

Another possibility is that there could be something blocking one of the gears, preventing it from shifting into place.

Hummer H2, H3 Transmission Replacement Cost

The cost of replacing a Hummer H2, H3 transmission can vary depending on the year of the vehicle and the type of transmission that needs to be replaced.

The average cost for a Hummer H2, H3 transmission replacement is between $4,000 and $6,000.

The cost will be higher if the transmission needs to be replaced with a new one, rather than a used or rebuilt transmission.

Hummer H3 Transmission Rebuild Kit

A transmission rebuild kit for a Hummer H3 can cost between $1,500 and $2,000.

The price will depend on the year of the vehicle and the specific kit that is required. A transmission rebuild is a major repair and should only be done by a qualified mechanic.

Hummer H3 Transmission Solenoid

The solenoid controls the flow of transmission fluid and helps to shift the gears in the transmission.

If the transmission solenoid fails, it can cause serious problems with the operation of your Hummer H3.

There are a few symptoms that you may notice if the transmission solenoid on your Hummer H3 is starting to fail.

One symptom is that the vehicle may slip out of gear while driving.

Another symptom is that the engine may rev up but the vehicle does not move forward as it should.

The third symptom is that shifting gears may become difficult or impossible. If you notice any of these symptoms, get your Hummer H3 checked by a mechanic.

A failing transmission solenoid can lead to complete failure of the transmission, which can be extremely costly to repair.

Hummer H3 Transmission Fluid Change

If your Hummer H3 is due for a transmission fluid change, it’s important to know what type of fluid to use.

The best type of fluid to use is Dexron VI, which can be found at most auto parts stores. You’ll also need a funnel and some clean rags.

To change the transmission fluid, start by removing the dipstick and wiping it clean.

Then, add the new Dexron VI fluid to the transmission until it reaches the full line on the dipstick.

Finally, re-insert the dipstick and check the level again to make sure it’s correct.

How Long Do Hummer H3 Transmissions Last?

Assuming you are talking about the 2006 Hummer H3: The 2006 Hummer H3 has a 5-speed automatic transmission.

According to Consumer Reports, the average lifespan of a car’s transmission is around 100,000 miles.

So, if you keep your Hummer H3 well-maintained, you can expect the transmission to last for at least 10 years.

Of course, there are always exceptions to the rule.

If you don’t maintain your vehicle properly or if you regularly drive in harsh conditions (e.g., off-roading), then your transmission may not last as long.

What Problems Do Hummer H2 and H3 Have?

The Hummer H3 is a midsize SUV that was produced from 2006 to 2010.

The H3 was designed to be a smaller, more fuel-efficient alternative to the full-size H2.

However, the H3 did not live up to expectations and was plagued by a number of problems.

The most serious issue with the H2 and H3 was its engine. The standard 3.5L five-cylinder engine was underpowered and unreliable.

It was also one of the thirstiest engines on the market, averaging just 15 mpg in city driving and 20 mpg on the highway.

These poor fuel economy numbers were made even worse by the fact that the H3 required premium gasoline.

Another problem with the H2 & H3 was its suspension. The suspension system was not well suited for off-road driving, which is one of the main reasons people buy SUVs like the Hummer in the first place.

The ride quality on paved roads was also poor, with lots of bumps and jolts being felt inside the cabin.

Finally, many customers were simply turned off by the Hummer brand itself.

The oversized vehicles have long been associated with arrogance and excess, and many people didn’t want to be seen driving one (even if it was a smaller model).

What Transmission Does the Hummer Have?

The H2 & H3 Hummer comes equipped with a standard 5-speed automatic transmission.

This transmission features an electronically controlled overdrive with torque converter lockup in fourth and fifth gears.

For those looking for a more capable off-road vehicle, the H3 Hummer can also be had with a 6-speed manual transmission.

This transmission features a lower 4.03:1 first gear ratio that is ideal for crawling over rocks or slogging through deep sand.

ANOTHER transmission for the Hummer H3


The transmission was one of the main issues with the H2 and H3, as it was known to be unreliable and often needed to be replaced.

Other issues with the H2, H3 included poor fuel economy, uncomfortable seats, and a lack of cargo space.

Overall, the Hummer H3 was not a very successful model and it was discontinued in 2010 when GM filed for bankruptcy.


  • Robert Wilson

    Introducing Robert Wilson, your go-to source for automotive technical solutions. With 5 years of industry experience and a mechanical engineering background, Robert's expertise was honed at the heart of Ford Motors in Michigan back in 2010. Join him on this blog as he shares his knowledge and practical fixes to keep your vehicles running at their best.

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