Mercedes-Benz S600 Problem Report
Mercedes-Benz S600 Transmission May Leak Fluid and Damage Control Module
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.
My transmission conductor plate had this exact problem. I bought the car at 100,000 miles and after noticing the transmission clunking into certain gears and it getting stuck in a certain gear after rapid acceleration, I took it to the shop and it turns out that the gasket sealing the transmission had gone bad and fluid leaked onto the conductor plate and caused it to start to malfunction. The dealership quoted $2040 to fix it. I had another high end foreign car mechanic shop fix it for around $700. - Nlkuhn
Replaced gasket, conector, cleaned TCU with electric cleaner - Visitor
This problem happened three times. The transmission control unit filled with fluid from leaking ETC connector.
The Solution: They replaced control unit, locking pin, ETC connector plug, pilot bushing, trans.fluid - Visitor
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Diagnostic Trouble Codes:
P0311 P0312 P0308
Local Mercedes dealer's dia...