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Home > Technical > Diagnostic trouble code U0437 and P1889
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Luke-Br



Member Since: 29 Sep 2016
Location: Fortaleza
Posts: 3

Brazil 
Diagnostic trouble code U0437 and P1889

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

Post #308005 29th Sep 2016 4:37 am
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kh1959



Member Since: 14 Oct 2020
Location: Bath
Posts: 3

United Kingdom 

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

Post #399238 2nd Nov 2020 10:59 am
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alex_pescaru



Member Since: 12 Mar 2009
Location: RO
Posts: 4642

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.

Post #399268 2nd Nov 2020 7:02 pm
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