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Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz S500 4MATIC

Problem Description and Possible Solution

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. A new harness and control module may be necessary to correct this problem.

Problem Data
RepairPal Verified
Average mileage: 100,500 (60,000–141,000)
3 model years affected: 2003, 2004, 2005
5 people reported this problem
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Transmission sticking and car experiencing a delayed reaction upon changing gears.
leak at harness connector to transmission, should be repairred and paid by mercedes. only 60k on the car. 2004 s500 4matic. At dealer and they are replacing the o ring seal.