Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz C320

The electrical connector at the automatic transmission may leak fluid. Over time leaking fluid could migrate through the wiring harness and damage the transmission control module. If that happens a new harness and control module may be necessary to correct the problem.

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Average mileage: 111,285 (48,000–179,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
14 people reported this problem
8 people shared problem details
My car also gets this issue be side the cranshaft postion. Mercedes is truly a piece of expensive junk- costed us an arm and a leg to get many issues fixed..
Transmission Control Board failure. Have minor transmission leak a year ago.
Leaking transmission fluid at the 13 pin connector part cost 33.00 on amazon.com
Do you know of any recalls/warranties for this problem. My C320 is beginning to show some seepage.
transmission not "shifting" correctly; was told it had low transmission fluid from a leak & needed a new control module & possibly damaged wire connector, estimated costs $1200 ($400 parts, $700 labor) :-(
had a 2001 C320 with same trans problem. Cost $1400 for a new module. I sold the car not long after because I was tired of the repair ongoing repair expenses.
is the control module inside the transmission or on the outside of it.
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