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2013 MCT Transmission slip

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2013 MCT Transmission slip

Old 01-04-2019, 07:28 AM
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W204 C63
2013 MCT Transmission slip

So I've purchased this car back in August with 32k miles, vehicle ran strong with no issues. Around November the vehicle sat for a month, went to start her up and its first shift from 2nd to 3rd slipped really bad. Didn't think much of it so I kept driving, eventually I started to notice it was slipping from 1,2,3,4 and 5 about 200 to 500 RPMs depending on my throttle. I then decided to perform a full transmission flush since according to Mercedes records it never received one. The vehicle now has about 36k miles, purchased all the fluids, filter, gaskets, and bolts from Mercedes and performed the flush. Upon dropping the pan I noticed good amount of shavings on the two magnets, considering this pan has never been cracked open before I'm not sure if this was "normal" wear from the clutch or if I'm just super unlucky with this clutch wear (Attached images below). So, I proceeded with the flush and see if it at least helps. After completing I performed a TCU reset, put the car in sport and began the relearning process. The AMG drove a lot better but it still had a slight slip between 1,2 and sometimes 3. Drove it for a few days and performed the flush again without dropping the pan. The AMG now drives a lot better but not as great when I first purchased it. Still a slight slip between 2 and 3. On a hard pull the transmission shifts just fine, however I'm concerned if there's any underlying issues with the transmission that's preventing it from being nearly perfect.

According to Mercedes a ECU and TCU software upgrade is available, this'll be my next step and I'm hoping this'll resolve any issues. Also not to mention my CEL is on with P0171 (Bank 1 and 2 are lean), I don't think this has anything to do with the transmission as I'm sure its just a leaky vacuum hose as that seems to be common?

AMG currently has no mods besides ROW airboxes.

Since Mercedes will be doing the software upgrades I'm wondering if they'll be able to diagnose any underlying issues with the transmission (solenoids, valve body, etc) or if it's shifting as fast as it should be. Any thoughts or suggestions would be appreciated.


Last edited by C63AMGeez; 01-04-2019 at 07:37 AM.
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Old 01-04-2019, 07:50 AM
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2014 W204 C63 P31, 2009 Maserati GTS-F1, Porsche 981S, DD Lexus GS350
I’m not a fan of flushing gearboxes as many of the guys on here will probably agree. I much prefer drain and refill cycles, it may cost more, but it’s a safer bet.
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Old 01-04-2019, 09:08 AM
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The amount of build up on your magnets is not concerning in my opinion. I have flushed two torque converter 7g and one MCT 7g and saw a similar amount of build up.
As you dropped your oil pan, did the filter drop as well or did it stay clipped in?
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Old 01-04-2019, 12:18 PM
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Originally Posted by sventastic82 View Post
The amount of build up on your magnets is not concerning in my opinion. I have flushed two torque converter 7g and one MCT 7g and saw a similar amount of build up.
As you dropped your oil pan, did the filter drop as well or did it stay clipped in?

It stayed clipped in. Has anyone performed a TCU upgrade from factory and noticed any difference?
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Old 01-04-2019, 10:51 PM
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In the same boat as you my friend ... mine flares between shifts and it seems as if the car is confused on when to lock the gear once it shifts .
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Old 01-04-2019, 11:00 PM
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Magnets show normal break in wear material.
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Old 01-08-2019, 05:35 PM
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mine had the same. I unplug the minus battery pole for about 10 minutes and after the transmission ecu begins to learn from new. after reset shifting is harsh, after 50 miles normal drivimc its much better.
I had this after ecu upgrade, after headers and cats.
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