{SOLVED} Mercedes 722.9 Transmission Problems & Cost

Last Updated on October 31, 2023 by Robert Wilson

The Mercedes 722.9 transmission is a 7-speed automatic transmission that was first introduced in the W221 S-Class in 2007. This transmission is also used in the W212 E-Class, W218 CLS-Class, and W204 C-Class. The 722.9 transmission is highly regarded for its smooth shifting and reliability.

However, this transmission has been known to have some problems, especially with the early models.

Some of the most common problems include hard shifts, delayed engagement, and torque converter issues. These problems can be extremely frustrating for owners and can lead to expensive repairs.

Mercedes-Benz has long been known for its luxurious vehicles and cutting-edge technology.

But even the best brands can have issues, and Mercedes is no exception. Recently, many Mercedes owners have been complaining about problems with the 722.9 transmission.

This transmission is used in a variety of Mercedes models, including the C-Class, E-Class, S-Class, GLE, and ML.

And while it’s generally been a reliable transmission, there have been some reports of shifting problems, delayed engagement, and even complete failure.

If you’re experiencing any of these issues with your 722.9 transmission, it’s important to get it checked out by a qualified technician as soon as possible.

Mercedes 722.9 Transmission Problems

Credit: www.weistec.com

How Do You Reset a 722.9 Transmission?

If you’re looking to reset your 722.9 transmission, there are a few things you’ll need to do. First, you’ll need to find the right spot on the transmission.

Second, you’ll need to remove the battery and disconnect the negative terminal.

Next, locate the fill plug on the side of the transmission and remove it. Finally, use a funnel to add new fluid into the transmission until it reaches the full line on the dipstick.

How Do You Fill a 722.9 Transmission?

When it comes to filling a 722.9 transmission, there are a few things you need to take into account.

First, you need to make sure that the transmission is actually low on fluid. You can check this by looking at the dipstick; if the fluid level is below the “MIN” mark, then it’s time to add more fluid.

Next, you’ll need to find the right type of fluid for your transmission. The 722.9 uses Dexron III/Mercon ATF (Automatic Transmission Fluid), so be sure to pick up some of this before beginning.

Once you have the correct fluid, slowly pour it in through the dipstick tube until the level reaches just below the “MAX” mark on the dipstick.

And that’s all there is to it! Just remember to check your transmission fluid level regularly and top off as needed – happy motoring!

How Long Does a Transmission Last in a Mercedes-Benz?

A transmission is a vital component of any vehicle, and it’s important to know how long transmissions last in different types of cars.

In general, automatic transmissions tend to last longer than manual transmissions. But there are a number of factors that can affect the lifespan of a transmission, including driving habits, maintenance habits, and the type of car.

With that said, here’s a look at how long transmissions last in Mercedes-Benz cars. On average, Mercedes-Benz transmissions will last between 150,000 and 200,000 miles. However, this varies depending on the model year and type of transmission.

For example, older Mercedes-Benz models with manual transmissions may only last for around 100,000 miles.

Meanwhile, newer models with automatic transmissions can often go for over 300,000 miles without needing to be replaced. There are a few things you can do to help extend the life of your Mercedes-Benz transmission.

First and foremost, it’s important to keep up with regular maintenance like oil changes and fluid level checks.

Additionally, avoid putting stress on the transmission by avoiding quick starts and stops whenever possible.

If you drive mostly in stop-and-go traffic or city streets rather than highways, then you may need to have your transmission serviced more frequently than those who mainly drive on highways.

In short, there’s no one answer to how long a Mercedes-Benz transmission will last because it varies depending on various factors.

However, if you take good care of your car and its transmission specifically – through regular maintenance and careful driving – then you can expect it to last for many years without issue.

How Much Does It Cost to Replace a Mercedes Transmission?

Assuming you would like an answer for a Mercedes Benz transmission replacement, it would cost anywhere from $3000 to $5000.

This range depends on the type of Mercedes Benz you own and the year it was manufactured. The price also changes depending on whether you replace the entire transmission or just certain parts within it.

Here is a breakdown of what goes into replacing a transmission:

The first thing that needs to be done is to remove the old transmission. This requires jacking up the car, removing the wheels, unbolting the transmission, and then carefully lowering it out of the car.

-Once the old transmission is out, you can start putting in the new one. Again, this process starts with jacking up the car and removing the wheels. Then, bolt in the new transmission and lower everything back into place.

-After the new transmission is in, all that’s left to do is reconnect all of the electrical components and fluids. These include attaching hoses for coolant and oil lines, as well as plugging in sensors and linkages. Finally, fill up your tranny with fresh fluid and go for a test drive!

Mercedes Transmission 7GTRONIC 722.9 Conductor Plate Problems

722.9 Transmission Recall

In September of 2010, Mercedes-Benz issued a recall for 722.9 transmissions in some of their vehicles. The reason for the recall was that there was a problem with the transmission’s mechatronic unit, which could potentially cause the transmission to fail. If the transmission did fail, it would likely cause the vehicle to stall, and it could be very difficult to restart the engine.

This could pose a serious safety risk, particularly if the vehicle was in traffic when it stalled. Mercedes-Benz issued a service bulletin to dealerships in October of 2010, detailing the problem and outlining the steps that needed to be taken to fix it. The service bulletin advised dealerships to check for any software updates that might be available for the transmission control module (TCM).

If an update was available, dealers were instructed to install it. If no update was available, dealers were told to replace the TCM with a new one. In either case, dealers were also advised to inspect and clean the electrical connectors for the TCM.

The recall affected approximately 24,000 vehicles in total, including both cars and SUVs. Most of those affected were in Europe, but some were also sold in other markets such as Australia and South Africa. Fortunately, there have been no reports of accidents or injuries related to this issue.


Mercedes 722.9 Transmission Problems can be a real pain for owners. The transmission is known to have issues with hard shifting, delayed engagement, and even complete failure.

Fortunately, there are some things that owners can do to help prevent these problems from occurring. Regular maintenance and fluid changes are essential, as is keeping an eye on the condition of the transmission itself.

If any problems are noticed, it’s important to have them fixed as soon as possible to avoid further damage.


  • 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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