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Old 11-04-2021, 11:34 AM
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Join Date: Feb 2019
Posts: 110
Trans controller cleaning on w210 e300

Whereabouts is it located and how do you guys like to clean it? This morning the car was stuck in a gear and didn't want to shift and after I pulled over and shut the car off and restarted it she ran fine. I probably need to do the electrical plate inside the trans and give it some fresh trans fluid, but until I can get that knocked out I'd at least like to clean the connections on the trans controller and make sure fluid hasn't wicked up the wires.

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Old 11-05-2021, 06:00 AM
jay_bob's Avatar
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Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,941
It's inside the control box on the passenger side. Several modules live in there.

K40 (electrical distribution and relays)
engine controller
transmission controller
ABS controller

Can't remember which one is which but if you're wicking ATF it will be obvious unfortunately.

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The OM 642/722.9 powered family
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2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
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