Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz E500

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. At that point, a new harness and control module may be necessary to correct this problem.

Problem Data
RepairPal Verified
Average mileage: 98,309 (65,000–144,000)
4 model years affected: 2003, 2004, 2005, 2006
17 people reported this problem
Viewing 1 - 5 of 5 comments
Transmission sticks in first gear. The only way to fix is to turn the engine off and restart. Very intermittent problem. When it does happen, it seems to repeat itself for a few days, until the car sits for a day or two of no driving. Then it will not have this problem for a couple of months.
Car would jerk roughly. Started out as a very small problem and over about two years it progressively got worse. Replacement cost $1100.00 but in all honesty I'm not too upset. My car has not had a real problem in about 3 years it's still a very solid car.
Had transmission fluids changed. Then about three months later, I would get a hard jolt and clunking sound the first few stops I would make. After those first few stops, the problem would stop until the next day when it would recur again.

I brought it to my dealer who tried to program the transmission control module but the problem continued. He suggested replacing the module. Cost, $1,700. I believe the module was exposed to transmission fluid when the transmission was serviced. Can't prove it but I believe it.