Car Problem Reports

Mercedes-Benz ML350 Wire Connector on Transmission May Leak Fluid and Damage Control Module

Mercedes-Benz ML350 Problem
16 Reports
Me Too

Model Years Affected: 2003, 2004, 2005, 2006

Average Mileage: 81,136 mi (27,000 mi - 110,000 mi)


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.

  • Visitor, , 110,000 mi

    ml350 would start first thing in am, but on really hot days (85-90F), car would not start until it cooled down.
    dealer found that the transmission cable going to the harness mentioned, was wicking the transmission fluid to the trans control module. Heating up and affecting the ability to turn the starter. sounds like a recall item to me. Does anyone know if this is a recall or is in the process of being one.

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  •  Enthusiast

    I was told this is common to replace and considered standard maintainence for the vehicle.

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  • Visitor, , 63,250 mi

    Transmission seal leaking .. Due to faulty wire connector on transmission

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  • Visitor, , 86,000 mi

    Car overheated and stalled right after having a huge service bill the week before. Power steering was leaking as well.

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  • Visitor, , 91,000 mi

    CAn lose power and then must pull over and recycle ignition. Once that is complete it runs fine until the next episode.

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  • Down to 44 oz of fluid when found.

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  • Visitor, , 27,000 mi

    Leaking @ wire connection at driver side front of trans pan.

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  •  Rookie

    I have a transmission connector leak; they said "it has a rubber seal and over time its going to leak" ... they quoted me $240 to fix it.

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  •  Rookie

    Problem occurred driving up and down hills. The car could not go past 60mph. Had to stop, turn it off, and restart the engine. Took it in for service and the diagnostic report indicated issue with the TCM. There was transmission oil was found inside the TCM. Will have to replace the TCM and wire harness...

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