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.
Car Problem Reports
Mercedes-Benz C43 AMG Wire Connector on Transmission May Leak Fluid and Damage Control Module
Mercedes-Benz C43 AMG Problem
Visitor, 1999 Mercedes-Benz C43 AMG, 50,000 mi
Noticed transmission fluid leaking out of transmission wire connector during changing of the transmission fluid.
Replaced wire connector $20.
Transmission fluid must be changed at least every 50,000 miles $600.