W204 fault code Y3/8n4 VGS control unit

[Rayoz]

I have a 2014 c250 amg Estate 2.2 diesel auto.
I have a fault code showing Y3/8n4 vgs control unit faulty. Can anyone tell me please, what it relates to and is it an expensive fix.
TIA

 

[OneForTheRoad]

Conductor plate inside the gearbox.

7G-Tronic transmission - TCM conductor plate failure

Mercedes 7 speed transmission ECU (722.9 gearbox) is a common failure to cause gear selection problems, test and rebuild of your 7G-Tronic ECU

www.ecutesting.com