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Old 04-13-2012, 04:22 PM
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Join Date: Jul 2011
Posts: 23
2005 SLK 350 CODE u0101....LOST COMM. with TCM

Car threw this code U0101, car will not shift from 1st gear. It really thuds into any gear when you move it from park to reverse or drive. In the instrument cluster it doesn't show what gear the car is in since this happened. Is this just a recoding issue or has a specific part failed?

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Old 04-16-2012, 02:52 PM
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Join Date: Jul 2011
Posts: 23
I have the 7 speed tranny in this car. I know the previous tranny's had a problems with the TCM. I can't find one for this car, does the car not have a TCM?
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Old 04-17-2012, 09:28 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The trans ECU is part of the valve body, ONLY a MB dealer can get & code them!

Very common failure, MB has changed their fluid change strategy due to the number of failures. Now recommend every 40K services.

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