sm4rtc4r Posted April 9, 2022 Share Posted April 9, 2022 (edited) I am troubleshooting 3 lines on the dash. I took my vehicle to have Star Diag run on it and the TCM was determined to be faulty. Sent the TCM for repair but no luck. I have purchased a used TCM with the same part number as the original. Can anyone confirm for sure that the unit will require programming? With the new (used) TCM installed, I am able to move the shifter, the transmission goes into teaching mode (per the shifter motors shuffling) but still 3 lines on the dash. With both the original and new TCMs I get U0103 and 15/6 Electronic Lever Select Canbus faults. Thank you very much. Edited April 10, 2022 by sm4rtc4r More polite :) Quote Link to comment Share on other sites More sharing options...
jwight Posted April 10, 2022 Share Posted April 10, 2022 Assume you have a 451 since you are in the US... I did find this online. indicating the TCM needs some sort of "flash" to use with your particular car - take it for what it's worth: https://mhhauto.com/Thread-Smart-451-TCU-TCM-coding-replace If you can find an independent shop that does a lot of Mercedes work they may be able to help you. Quote Link to comment Share on other sites More sharing options...
Mjolinor Posted April 11, 2022 Share Posted April 11, 2022 It does not need programming on a CDI 451 but it will forever read a non matching VIN with Star. There are no side effects from this as far as using the car goes. I cannot comment on a petrol one, I have never swapped it on a petrol. Quote Link to comment Share on other sites More sharing options...
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