RR L320 air suspension problem

Hi guys, in have some troubles with my RR L320 2009.
For the last weeks when I am driving all of the sudden 'HDC fault' pops on. When this happen everything is ****ed up. The front of the car drops down and the rear goes high in the sky.
When I read the codes I got mostly these 2: U0416-94 and U421-94. I have take a look at the air valves , compressor, airsprings,...

I start to think it's the Dynamic control module that is broken.
Is this possible or are there other things that I can do more to maybe fix this issue?

I don't now anymore.

Thanks guys
Thibo

have you checked that actual wires/connectors? a corroded or damaged wire/connector will cause 'invalid data'

kermit_rr said:

have you checked that actual wires/connectors? a corroded or damaged wire/connector will cause 'invalid data'

Click to expand...

I already checked all the wires and connectors but everything looks fine