DTC U0001-81: High Speed CAN Communication Bus - Invalid serial data received: Action

WARNING: This page is about a different car, the 2021 Land Rover Range Rover and 2020 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Do NOT replace any Control Modules just on the basis of this DTC
Guided Diagnostics must be followed and the repair advised by the process completed. Failure to do so may result in the rejection of any warranty claim made

Using the Jaguar Land Rover approved diagnostic equipment, check the snapshot data to determine the invalid data source control module. Check datalogger signal - Network Operating System ECU Local Signal Handle (0xD020). Refer to appropriate service information. Check other modules for the same DTC indicating a fault in the wiring harness and/or incompatibility in the software version
Refer to the appropriate service information and check the high speed CAN bus (chassis) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Refer to appropriate service information connector and circuit information