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.Google+
Car Problem Reports
Mercedes-Benz CLK320 Wire Connector on Transmission May Leak Fluid and Damage Control Module
Mercedes-Benz CLK320 Problem
Average Mileage: 90,705 mi (66,000 mi - 114,000 mi)
Visitor, 2005 Mercedes-Benz CLK320, 66,000 mi
Trasmission fluid pouring out tof the bottom
Visitor, 2004 Mercedes-Benz CLK320, 114,000 mi
The transmission shifts sluggishly from second to third gear when in Drive. Down shifting is also very sluggish. Tech at my repair shop discovered that the wire harness had the fluid in it, cleaned it all up and did a transmission service to replace the fluid, now we are waiting on the cost for the control unit. Hope that fixes the issue.
Visitor, 2005 Mercedes-Benz CLK320, 92,115 mi
Noticed small leaks under transmission pan. Connector was leaking. Mechanic informed me that there was a TSB put out by MB.