Customer did long journey in car to family for christmas. Parked up for two days, now won't start.
Vehicle recovered to me for diagnosis. No comms with engine ECU, and all other fault codes in various systems relate to no comms. All wiring visually looks ok, CAN lines seem fine.
ABS module constantly clicking when ignition on.
Very slight water ingress into under bonnet fuse module but no significant damage.

Any help much appreciated!!