Hi Guys,
I have a W251 R320CDI 4Matic with VGS2 TCU. P0721 fault code appears with the following text: the transmission output rpm signal value for the wheel speed rpm signal is not plausible.


Also there is P5399, P5026 and P5420 fault codes in event log.

When the P0721 appears, the transmission doesn't give any torque to the wheels until the code is not deleted. I replaced the right-rear wheel speed sensor, because other benz forum says, that it can fix this issue. TCU already has been re-manufactured, so it should be fine. Did anybody meet with a similar issue?

Thanks.

 

I did with my R63. Conductor Plate is failing and needs replacement.