The electrical connector at the automatic transmission may leak fluid into the wiring harness. If not repaired, the oil will migrate through the wiring harness and damage the transmission control module. At that point, a new harness and control module may be necessary to correct this problem.Google+
Car Problem Reports
Mercedes-Benz SLK320 Wire Connector on Transmission May Leak Fluid and Damage Control Module
Mercedes-Benz SLK320 Problem
Visitor, 2001 Mercedes-Benz SLK320, 120,000 mi
Trans fluid leaking from around electrical connector.
$400 to drop pan, replace connector and rubber pan gasket and reinstall and refill with fluid at transmission shop.