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.
Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz G500
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2003 Mercedes-Benz G500 61,000 mi, Visitor
Oil like fluid found in Connectors at Transmission Control Unit, Caused Many different Problems (Alarm, ABS, ESP, etc...)