This procedure will reset the adaptive shifting points in your Mercedes-Benz automatic Transmission Control Unit (TCU). These simple do it yourself instructions take less than 5 minutes. No tools are required to perform this procedure and make your Mercedes-Benz shift like new. Try this if your car has been shifting sluggish recently. This will make your car fun to drive again, it’s like getting a free tune-up. This procedure applies to all Mercedes-Benz that come with the 5-speed 722.6 and 7 -speed 722.9. This is about 95% of Mercedes-Benz cars on the road today with the exception of models made before 1995. This reset procedure works on automatic transmission only.
Does this really work?
Yes! The Engine Control Unit (ECU) monitors your driving habits. It records the driving style, usually by looking at the last 40 shift points and adjusts so the car shifts accordingly to your style. It does this by monitoring different sensors such as the throttle or the gas pedal input and more. In other words, it learns your driving style. If you race your Mercedes-Benz, it will remember that and keep the gearbox in gear longer. If you drive it gently, it will adapt to that as well and change gears earlier.
Procedure Reset Transmission Adaptive Learning DIY
- Turn the key to position 2. You should see all the dash lights come on. Do NOT start the car. Position II: You should hear two clicks and all your dash lights should turn on. Do not start the engine.
- Press the gas pedal all the way. By pressing the accelerator pedal to the floor, you will activate the kick down switch. Keep the gas pedal pressed all the way to down.
- Wait. Continue to keep the gas pedal pressed for at least 10 seconds.
- Turn key to OFF, position 0. Don’t remove the key. Some models may need the key to be removed.
- Release the gas pedal.
- Wait 2 minutes. During this process, key is left in the ignition in the OFF position.
- Start the car and drive.
Once you perform this procedure the Engine Control Unit (ECU) and Transmission Control Unit (TCU) will work together to learn how you drive by monitoring your driving pattern. After you follow this programing method of the TCU / ECU drive the car for 15 min. Do not race the car, unless that’s how you plan on driving all the time. You should have a transmission that shifts smooth and normal. You may feel like you have a new transmission!
Video: How to reset, program Mercedes-Benz transmission.
How often should you perform this reset?
Even though the car is supposed to relearn and adapt to your driving style and habits automatically, that works better in theory than in practice. Engineers at Mercedes-Benz had a good idea in mind. We would recommend that you perform this once a month, but honestly it’s all up to you.
This procedure should help if your transmission shifts randomly or jerks. If transmission changes gears when not expected. If you are experiencing random downshifts or upshifts.
Does the dealer perform this procedure?
Yes, but using a different method. This procedure can also be performed by Mercedes-Benz dealer using Xentry DAS Diagnostic Scanner. This reset can be found under Control Units – Drive- Transmission – Control Unit Adaptations or Adaptation – Display and reset of adaptation data – Resetting of adaptation data
This should work on E, CLK CLS CLA ML GLK S SLK C models, Crossfire, basically any Mercedes Benz years:
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
Did this work for you?
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