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Mercedes-Benz S430 Problems

Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz S430

Problem Description and Possible Solution

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.

(19 people reported this problem)

Mercedes-Benz S430 Vehicles With This Problem

RepairPal Verified
Average mileage: 99,800 (22,000–150,000)
7 model years affected: 2000, 2001, 2002, 2003, more2004, 2005, 2006
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Viewing 1-7 of 7 comments
MY TRANSMISSION FOR S430 ENGINE IS TO SLOW
BEFORE CHANGE TO THE SECOND SPEED ONLY ON THE MORNING
OR AFTER 10 OR MORE HOURS WITH OUT WORK
Brought car in for service for another issue and mechanic told me transmission was leaking and traveled through wiring harness to control module. Leaking part was replaced, control module was cleaned.
leaking transmission by the plug,so now i am going to change fluid along with the plug when i purchase it
I had the same problem with the TCM. I had the conductor plate replaced and the TCM was cleaned of all oil. After that, the transmission worked fine but the ESP, ABS, SRS, and BAS lights continue to stay on. The vehicle is in the shop now (again) to correct this problem with the malfunctions.
Just had the transmission control module replaced by the dealer. Wasn't cheap, $955.00 including parts and labor.
TRANSMISSION IS LEAKING FLUID GOT VEHICLE DIAGNOSE TO BE TOLD THAT CONNECTOR IS LEAKING HAVING IT FIX - KNOWING ITS GONNA BE EXPENSIVE