Transmission Connector Plug For Mercedes W203 W211 W163 R171 – A2035400053

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Description

If your Mercedes has a transmission leak at the electrical connector, or you're getting shifting issues, this connector plug is a common fix.

1997-2005 Mercedes-Benz C230 Transmission Connector Data Plug Bushing | 2035400153 | Genuine OEM | 1

It fits the W203 C-Class, W211 E-Class, W163 M-Class, and R171 SLK – basically any Mercedes with that 5-speed or 7-speed transmission that uses the A2035400053 plug.

Transmission Plug 13 Pin Car Transmission Connector Adapter Plug Replacement for 2035400253 Wire Harness Connector

This aftermarket version is made to the same specs as the OEM part, so it fits perfectly and seals just as well.
The job involves dropping the transmission pan (or at least draining the fluid) and replacing the plug that goes through the trans housing.
It comes with the internal wiring harness connector and the outer seal that stops ATF from wicking up the wires – a known issue on these cars.

TRANSMISSION CONTROL UNIT Conductor Plate TCU For Benz W203 W211 W163

Brand is aftermarket, but quality is decent.

122CM Auto Car Transmission Gearbox Dipstick for Mercedes-Benz W163

UPC is 6971003562298 for reference.

New Transmission Plug Connector 5 Speed 722.6 For Mercedes Benz C E S G

If you've got ATF in your transmission control module connector, this is your fix.

OEM Automatic Transmission Adapter Plug 2035400053 Mercedes Benz E320 E350

Much cheaper than a dealer part, and it solves the problem permanently.
Good DIY job if you're comfortable with basic transmission work.

722.6 Automatic Transmission Connector Plug for Mercedes W203 W204 CL203 W639