Mercedes mct transmission problems

Mercedes-AMG's MCT Transmission Explained In Layman's Terms

September 20, — Mercedes-Benz The The plaintiffs claim Mercedes has known about the transmission problems based on technical service bulletins TSBs sent to dealerships. The problems have allegedly been so severe that at one point Mercedes was unable to keep up with orders for replacement Additionally, the lawsuit alleges Mercedes blocked independent repair facilities from buying replacement parts. Owners complain about the dangers of driving when the transmissions enter limp mode.

There is a systemic problem with the Mercedes Benz 7G tronic The owner also mentioned the same problem as mentioned in the lawsuit concerning independent repair shops unable to get parts. The failed valve body or conductor plate allegedly causes serious safety issues as the transmission tries to shift from first to second or higher gears while driving.

The vehicle will enter limp mode no matter what speed the vehicle is traveling, causing drivers and others on the highway to cope with the sudden hazards. Despite this, the automaker has allegedly failed to take action to protect customers and fix the transmissions, especially when failures occur outside the warranty periods.

Owners also claim they are stuck paying huge bills to replace the 7G-Tronic transmissions when Mercedes should be responsible for the alleged defects. One of the plaintiffs says his vehicle suffered from transmission failure and he was stuck with the bill. Months later Hamm noticed the car would occasionally go into limp mode wherein the car got stuck in a low gear and wouldn't accelerate.

mercedes mct transmission problems

The plaintiff says he took the vehicle to a mechanic who said the problem would be tough to diagnose because it happened sporadically. Hamm claims the vehicle continued to enter limp mode every six months, but by the problem got worse and the engine light illuminated. Hamm then brought his vehicle to a repair shop that said the Hamm claims he repeatedly asked for help from Mercedes and its dealers but was refused at every corner because the warranty expired.

According to the class-action lawsuit, the The lawsuit alleges this shows the automaker had five years to admit the transmissions were defective.

The Mercedes-Benz Owners claim Note: The online Owner's Manual is the latest version available.

Mercedes-AMG's MCT Transmission: Design Peculiarities and Principle of Operation

Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment. Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle. If the engine speed is above the idling speed and you engage transmission position D or Rthe vehicle could pull away suddenly.

There is a risk of an accident. When engaging transmission position D or Ralways firmly depress the brake pedal and do not simultaneously accelerate. If the engine speed is too high or if the vehicle is rolling, do not shift the transmission directly from D to Rfrom R to D or directly to P. Do not open the driver's door while the vehicle is in motion.

At low speeds in transmission position D or Rpark position P is otherwise engaged automatically. The current transmission position PRN or D appears in the transmission position display in the multifunction display.

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If you wish to select a transmission position or to disengage park position Pthe engine must be running.

Press the P button in the centre console. If you open the driver's or front-passenger door during this period, the transmission automatically shifts to P.

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This still applies if you open the driver's or front-passenger door. Further information is available in the "Car wash" section more.

In addition to drive program being shown in the multifunction display, the currently selected drive program is indicated in red on the drive program selector switch.

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If you have restricted the shift range, the transmission position and the selected shift range, e. D3, are shown at position. Parking lock. This prevents the vehicle from rolling away when stopped. Do not shift the transmission into position P unless the vehicle is stationary. Reverse gear. Only shift the transmission to R when the vehicle is stationary. No power is transmitted from the engine to the drive wheels.

Releasing the brakes will allow you to move the vehicle freely, e. Do not shift the transmission to N while driving. This can damage the transmission. All forward gears are available. The transmission shifts into individual gears automatically. This automatic gearshifting behaviour is determined by:. A dynamic driving style with high longitudinal and lateral acceleration delays the shift points to higher engine speeds. When shifting down, the double-clutch function is active regardless of the currently selected drive program.

The double-clutch function reduces the load change reaction on the drive axle. The sound generated by the double-clutch function and its characteristics depend on the drive program selected. Kickdown is not available in manual drive program M. In the automatic drive programs, depress the accelerator pedal beyond the pressure point. Depending on the selected drive program, the transmission shifts to the lowest gear permissible to give optimal acceleration. Drive program. C Controlled Efficiency.Life is like a box of chocolates.

Seven gears is the standard for all Mercedes-Benz vehicles, which is not something that any competitor can say. The E-Class Mercedes-Benz is mostly known for luxury and comfort. Once you slap an AMG badge on it, that all goes out the window to make room for insane performance.

One simply lets go of the first gear while the other grabs the second gear simultaneously. Aside from Mercedes-Benz, with a few exceptions, the only place you will find this kind of technology is in a Bugatti or Lamborghini. That is one tenth of a second, or three times faster than the blink of an eye!

So next time you blink, remember that somewhere out there, an E 63 S shifted three times. The traditional torque converter was replaced by a wet clutch for heavy starts.

This is substantial because it makes the transmission smoother, more responsive, and more dynamic. The reason for this is because the liquid in the sump gives the clutch a lower rotational inertia resistance to change in motion than a traditional torque converter.

To sum it all up, the transmission in the E 63 S is faster, smoother, stronger, and lasts longer than competitors in the same class. Race-Start Clutch The traditional torque converter was replaced by a wet clutch for heavy starts. Which Mercedes-Benz vehicle should I get?

What is the fastest Mercedes-Benz vehicle? Join the conversation 0 comment s Cancel reply.Cama motors deeply regrets its association with Mercedes Benz. There is an information blackout on the subject yet piecing together the "service information and measures" with our warranty data we can see that many defects of the sensors in the transmissions cause total gearbox failures while driving.

When transmission defects were not too common beforethe Mereceds Benz 6 speed gearboxes used to go into a true "limp home mode" where the driver could never shift the gear beyond first gear till the failed internal sensor or mechanical defect was addressed in a workshop.

With the introduction of the most defective transmission Please take the time to Google the terms As a result Daimler Engineers seem to have deactivated the previous limp-home system, putting the car in third gear without a serious warning to the customer such that when the car is restarted a self check restores the car to normal functioning gear change available until the next occurrence of sensor failure.

In this way most customers would not even notice the defect but in rare case if the defect occurs while the customer is overtaking, without warning he may be unable to accelerate and may die as a result. Only the company engineers would be able to go into the stored faults and see the KM reading of Fault occurrence whereby the evidence is totally within their control!! Aftermarket scanners are not allowed to display THIS information. Understanding the risks Daimler AG has turned off the warning system and they use this as a trick to replace affected parts without admitting the failure.

This is a case of increasing the customer's exposure to death just to avoid a recall campaign. After two car's belonging to our companies have been found and proved to have these failures along with a large number of our customer's cars, we have been refused even a response to our questions!!!

Customers have even been asked to bring back their cars when "alleged" defect appears which further deceives them to believe that the fault is not serious.

mercedes mct transmission problems

The same defects are known worldwide and there is evidence of total disgust at this cover-up. Glycol from coolant radiators is also known to contaminate the transmission fluid for which documents are circulated to dealers and later the faulty radiators were redesigned with no accountability to affected customers. Additionally the ENDLESS reprogramming of the Transmission Control Unit goes on to this day as can be seen from this list of repeat measures for newer experimental control unit software.

In fact as can be seen here Daimler AG treats a moving car with a locked gearbox as a regular event needing valve body replacement and now refuses to answer when asked the following question:. Please keep checking for new information. Transmission Failure. Rate this item 1 2 3 4 5 40 votes. The answer to this question alone could see Daimler AG charged with manslaughter!!! Home About us Disclaimer Contact Us. All Rights Reserved. Replacement of defective Transmission adaptor Electronic coupling to avoid leakage of transmission fluid.

Limited list provided.This fifth-generation transmission was the first seven-speed automatic transmission ever used on a production passenger vehicle. It also soon became available on many six-cylinder models. Turbocharged V12 engines, four cylinder applications and commercial vehicles continued to use the older Mercedes-Benz 5G-Tronic transmission for many years.

The company claims that the 7G-Tronic is more fuel efficient and has shorter acceleration times and quicker intermediate sprints than the outgoing 5-speed automatic transmission. The transmission can skip gears when downshifting. It also has a lockup torque converter on all seven gears, allowing better transmission of torque for improved acceleration. The transmission's casing is made of magnesium alloya first for the industry, to save weight.

In JulyMercedes-Benz announced they are working on a new nine-speed automatic. It uses no bands nor sprag clutches [4]. Turn out the design as advanced compared to its predecessor but less economical compared to its competitors. In normal condition it sequentially shift gears, but if required can skip some gears, that are: 7 to 5, 6 to 2, 5 to 3 and 3 to 1. For 6 or 8 cylinder gasoline engines and if Sport mode is not selected, transmission will start in 2nd gear.

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Also, if it is a Off road vehicle, if Low range is selected, will start in 2nd gear too. If emergency mode is activated, like when occurs an electric fault or another critical fault, 6th gear default is selected all solenoids off.

It is a fully electronic controlled unit. Torque converter lock up can operate in all 7 forward gears. Sporty, performance-oriented version with the same gear ratios. Instead of a torque converter, it uses a compact wet startup clutch to launch the car from a stop, and also supports computer-controlled double declutching. The driver can change gears either using the selector lever, or by nudging the steering-wheel shift paddles.

The new Race start Function is a launch control system which enables the driver to call on maximum acceleration, while ensuring optimum traction of the driven wheels. Improved with the release of the model year, by decreasing lag time between shifts. From Wikipedia, the free encyclopedia. DaimlerChrysler press release. Archived from the original PDF on Retrieved Archived from the original on International Mercedes-Benz World.

Cars portal. Hidden categories: CS1 maint: archived copy as title All articles with unsourced statements Articles with unsourced statements from November Namespaces Article Talk. Views Read Edit View history. By using this site, you agree to the Terms of Use and Privacy Policy.To ensure long life and peace of mind in your 7-speed The The two variants will be referred to as the red-fluid version, and the blue-fluid version.

The red-fluid transmission service intervals are 40, miles, and the blue-fluid transmissions need servicing every 70, miles. The quickest way to see what you have is by checking the dimples.

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The blue-fluid transmissions require an exclusive fluid that does not interchange with other transmissions. The trouble with the It must be filled from the drain plug with a special filling pump and pan adapter.

While this is a somewhat expensive special tool, it would be beneficial to own if you plan on doing more than one Another option is something along the lines of this. I like to do transmission work after the car has been sitting overnight in order to avoid the incessant dripping of ATF that makes the job overly messy. The first step is to pull the drain plug and drain the contents into an appropriate container.

Do not reinstall the plug at this point. Next, you must knock off the fill pipe that is attached to the drain plug hole inside the pan. This is best done with a small screwdriver and will liberate another quart of fluid. You must move these out of the way, or you will surely roll the pan gasket during reassembly. Seriously, ask me how I know about that. Remove the six E10 Torx screws and drop the pan. I like to remove five screws and hold the pan up with my hand when removing the last screw.

After dropping the pan, look for any large metal shavings or chunks to gauge the health of the transmission. The magnets in the pan will probably look like small Chia Pets under normal conditions.

Spiny sea urchins exist in damaged transmissions.Mercedes-AMG, commonly known as AMG, is a division of Mercedes-Benz subsidiary of Daimler AGwhich produces more powerful and sports-oriented car models or modifications of the German Auto Giant, powertrain components engine, transmissionas well as its own racing cars and represents interests of Mercedes-Benz in motorsport.

In contrast to conventional automatics and double-clutch solutions, this product has neither torque converter TC nor double-clutch mechanism.

mercedes mct transmission problems

Instead of the TC unit, this solution is equipped with a space-saving clutch package, which operates in the oil bath. There are several clutches, which are positioned together, but controlled separately.

This nsolution can be easily distinguished from doublel-clutch gearboxes because it has only one input shaft. Now, this transmission technology is available in 7-speed and 9-speed versions. Seven-speed version. Produced inthe 7-speed MCT unit became the first-of-its-kind technology implemented in a production car. Owners of this model were impressed with operational characteristics of the gearbox and its responsiveness.

In fact, this gearbox is a unique solution combining a planetary design used in conventional automatics and a clutch similar to that found in manual transmissions.

Thanks to the minimum inertia of the rotating masses and higher reaction time, this transmission unit rules out interruptions in torque delivery in contrast to standard automatics equipped with torque convertersthereby ensuring better fuel economy.

This unit can operate at engine RPM rate of up to 7, This unit is used on quite powerful models of the AMG Series. The minimum shifting time is 0. Gears can be changed either via the gear shifter or with the help of paddle-shifters on the steering wheel. The newly introduced Race Start function ensures max speed-up capacity and optimal traction of the drive wheels.

mercedes mct transmission problems

Nine-speed version. To add two more gears, AMG engineers had to upgrade some hard parts of the unit. Moreover, they also had to introduce some changes to the software part and calibration adjustments to provide optimal operating characteristics. As a result, this transmission unit guarantees extremely quick gear shifting.

As well as its 7-speed analog, the 9-speed Speedshift version can carry out several downshifts at once. Application of Multi-Clutch Technology in different types of vehicles. This transmission technology is usually used in vehicles operating under severe conditions, where an ideal responsiveness is needed, along with the necessity to deal with a maximum level of torque.

It should be noted that multi-clutch gearboxes are not the same as multi-plate clutches.

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