Hi all,
I have A FL2 SD4 2012 and did a Diagnostic reading after I had a message on the display saying : transmission fault - traction reduced

The diagnostic reading gave me 2 trouble codes:

U 0437 - Invalid data received from rear diff control unit (on the all terrain control module diagnosti test)

and

P 1889 - Oil pressure performance (on the rear diff diagnostic test)

Now I allready did extensive research on the net that gave me a lot of info on glogged or faulty oilpumps on th haldex coupling with regards to P 1889 code

But with regards to the first code, the U 0437 code I found nothing. only some related comments tlling me to check the connectors on both sensor as well asthe control unit, and also comment to change the sensor.

Now befor I start ordering and changing parts I would like to know for sure wich part is the faulty one.

Anyone any experiences with the combination of both codes or in particulary the U 0437 code?

Regards from Brasil

Luke

I have exactly the same issue and the same codes but can't find any additional words of wisdom

Ignore the error about invalid data.
A lot of these errors can appear because of different startup times between different modules.

Focus on the real error, P1889.