Replaces the failed conductor plate, 13-pin adapter, filter and pan gasket on Mercedes 722.6 transmissions stuck in limp mode.
When a Mercedes C-Class, E-Class, ML or S-Class with the five-speed 722.6 suddenly holds second gear, revs past 4,000 rpm at 30 mph and lights the check engine lamp, the conductor plate is the part most rebuilders check first. This kit replaces that plate and the two pieces that usually get skipped on the same job: the 13-pin case connector adapter and the filter and pan gasket. It cross-references 1402701161, 2035400253, 1402710080, 1402770095 and 044-0370, and it is the complete parts list for an in-car conductor plate repair.
The plate is a flat circuit carrier that sits on top of the valve body inside the pan. It links the 13-pin connector on the side of the case to the transmission's shift and pressure solenoids, carries the fluid temperature signal, and contains the two internal speed sensors, N2 and N3. N2 reads input shaft speed whenever the vehicle moves; N3 reads the intermediate shaft in second through fourth, so the controller can prove the gear it asked for is the gear it got. Years of heat cycling crack the plate's traces and contacts. When a speed signal drops out the controller can no longer check the ratio, so it locks the transmission in a fixed gear to protect it. The plate cannot be repaired on the bench; it gets replaced.
Read codes from the transmission controller itself; a generic engine reader may only show P0700. Then unplug the 13-pin connector and look inside. Fluid in the plug means the adapter seals have failed and ATF has been wicking up the harness, which can cause speed sensor faults on its own. That is the reason this kit includes the adapter: change the plate but keep a leaking adapter and the fault comes back. Transmission Digest also documents that the controller may not set a code until a speed signal drops completely to zero, so an intermittent highway hesitation with no codes can still be a plate. Our 722.6 conductor plate failure guide walks through the full diagnosis, and the 722.6 speed sensor symptoms guide explains how to read N2 and N3 data.
The listing covers the 722.6 five-speed in C230, C240, C280, C320, C55 AMG, CLK320, CLK430, CLK500, E320, E350, E430, E500, E55 AMG, S430, S500, S600, SL500, SL600, SLK230, SLK320, ML320, ML350, ML430, ML500, G500, G55 AMG, CL500 and CL600, plus the 2010-2012 Sprinter 2500 and 3500. The 722.6 was built with several plate revisions from the late 1990s into the 2010s, so compare the part number on your old plate, or send us your year and VIN before ordering. Chrysler, Dodge and Jeep owners with the NAG1 version should look at the W5A580 conductor plate. All parts for this family are in the 722 transmission collection.
The transmission stays in the car. Drain the pan, remove it and pull the filter, then release the 13-pin adapter from inside the case and unplug it. Unbolt the valve body in a criss-cross pattern and lower it level so the separator plate does not shift. On the bench, remove the solenoid covers and brackets, note each solenoid's position, and lift the old plate off its plastic tabs. Fit the new plate, return the solenoids to their original bores, and reinstall the valve body, torquing evenly. Fit the new adapter with its pins straight and the bayonet fully seated; a bent pin can cut power to the solenoids. Install the new filter and gasket and refill with an MB 236.14 approved ATF, setting the level at the specified fluid temperature as our 722.6 filter and pan service guide describes. Finish by clearing codes and resetting the transmission adaptations with a capable scan tool. If testing points to worn valve body bores rather than electronics, a 722.6 valve body with solenoids is the next step.
| Kit contents | |
| Transmission | |
| Reference numbers | |
| Fits | |
| Brand |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The conductor plate, the 13-pin case connector adapter, a transmission filter and a pan gasket. Fluid is not included.
Its seals harden and let ATF wick up the wiring toward the control module, which causes the same speed sensor faults as a bad plate. Replacing both fixes the leak path and the plate in one job.
No. The pan and valve body come down from underneath with the transmission in the car. Plan on several hours the first time.
This kit is listed for Mercedes-Benz models and the 2010-2012 Sprinter. For Chrysler, Dodge and Jeep NAG1 applications, see our W5A580 conductor plate, and match your old plate's part number.
Clear the codes and reset the transmission adaptations with a scan tool that supports the 722.6, then drive through all five gears several times at operating temperature.
An ATF carrying Mercedes approval MB 236.14, which is backward compatible with the older 236.12 and 236.10 fills. Do not use ATF+4 or Dexron in a Mercedes or Sprinter 722.6.
