Gearbox over revving and paddle shifters does not work when transmission gets to temp
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2016 Mercedes cla 220 amg
Gearbox over revving and paddle shifters does not work when transmission gets to temp
Hi all,
Hoping someone can help me with my issue. I Have a 2016 cla amg. before i changed out the transmission fluid, my cars transmission would start over revving and have a "slipping" feeling after about 20 minutes of driving plus the paddle shifters wouldn't work when it happens. Now that I've changed the fluid out it's happening after 40-50 mins of driving with the same symptoms, changes gears after about 2500 rpm and manual mode does not work. Almost like the car has put the transmission into some sort of protective mode. Drives perfectly when cold. When i restart the car drives fine until it senses the temp again I'm assuming.
Hoping someone can help me with my issue. I Have a 2016 cla amg. before i changed out the transmission fluid, my cars transmission would start over revving and have a "slipping" feeling after about 20 minutes of driving plus the paddle shifters wouldn't work when it happens. Now that I've changed the fluid out it's happening after 40-50 mins of driving with the same symptoms, changes gears after about 2500 rpm and manual mode does not work. Almost like the car has put the transmission into some sort of protective mode. Drives perfectly when cold. When i restart the car drives fine until it senses the temp again I'm assuming.
Senior Member
Joined: Mar 2025
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From: Toronto
2025 AMG G 63 SUV /// 2025 AMG GT 63 S E Performance 4 Door Coupé
Have you checked if enough fluid was put in after service, low fluid could cause this. Also faulty solenoids or sensors could cause this to happen as well. As for the paddles this could relate to the TCU sensing an issue with the transmission. In reality all of what you’re explaining could be from a faulty TCU. Did Mercedes do the service, do you have a code scanner?
Thread Starter
Newbie
Joined: Apr 2025
Posts: 2
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2016 Mercedes cla 220 amg
Have you checked if enough fluid was put in after service, low fluid could cause this. Also faulty solenoids or sensors could cause this to happen as well. As for the paddles this could relate to the TCU sensing an issue with the transmission. In reality all of what you’re explaining could be from a faulty TCU. Did Mercedes do the service, do you have a code scanner?
I have a cheap scanner that shows no codes at all. And the service was done by my local mechanic so unsure of the fluid level. Would it be possible to check with the oil dip stick?
MBWorld God!
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From: San Antonio, USA
C204 C63 P31, A205 C63, C204 C63 507 Edition, C117 CLA 45
The transmission in the CLA 45 is a true automated manual transmission. The TCU works with a shift solenoid to act as a clutch pedal. The first thing I would check is that solenoid, it is right next to the subframe with a heat shield between it and the downpipe.
MBWorld God!
Joined: Dec 2019
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Yup it is basically a manual transmission controlled by a computer, the MCT in the C 63 S is even more so, the DCT in the CLA 45 is "simpler."
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