Accessing BCM

[Tander]

To get the BCM out? Fck no.

To trace the water ingress? Maybe but highly unlikely.

Find a local VW Group specialist.

So another update. Coolant migration. This is the term used.

Local garage has been great and diagnose the issue and repair steps. Price is less than 1/2 what the dealership quoted.

This is their report:

“confirmed customer complaint. removed body control module and confirmed there was water ingress to control module, one pin has broken off and there are signs of corrosion. BCM will require replacement and wires in plug will require repair. traced water leak to coolant expansion tank. this is a known issue and coolant leaks through plug, down loom and into BCM.

replacement of BCM and expansion tank required. will need to soak loom in isopropyl alcohol to get coolant out.”