Transmission May Leak Fluid and Damage Control Module on Mercedes-Benz ML320

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.

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Average mileage: 137,833 (60,000–200,000)
6 model years affected: 1998, 1999, 2000, 2001, more2002, 2003
17 people reported this problem
8 people shared problem details
Check engine lit came on. Vehicle went into "limp" mode. OBD II read 0715. Replaced conductor plate, harness connector, pan gasket and filter. Noticed leak at connector during disassembly and cleaned with WD40 prior to reassembly. Worked to get out. Of limp mode unseccessfully, but it did not throw the code again for 3 days. When it did, I went back under and pulled the harness connector to find more fluid, this time running down and out of the wiring harness itself. Inspection at the TCM shows the fluid had not made it all the way up. Now saturating lower part of harness and connector with WD40. This is thinning the tranny fluid and allowing to run out of the harness and connector. I am hoping this will keep the fluid from advancing any further toward the TCM. wish me luck. Otherwise it is a new harness.
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oil leaks underneath the dash passenger side, wiring to the electronic transmission unit I think part no. a 303 545 27 32, is this cable or wiring connected down to the transmission or if coming from the transmission, please let me know thank,s email artransmed@roadrunner.com
1 person likes thisFlag inappropiate
The great is not selecting
Had trans problem where would not shift into higher gears. Brought to Aamco, Henderson, NV and fixed the problem, said there was oil on the wiring harness. Now I cannot pass the emissions test because check engine light stays on and test says I have a transmission control module problem.
It leaks Transmission fluid all the time.
The gear was frozen, it would not change, wire harness to transmission needed to be replaced, transmission fluid was full. Still working on problem ordering wiring harness.
Just reported at oil change. Scheduling R&R
I was lucky that the MB technician discovered the problem during a transmission oil change.
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