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

NOTE: Re-configuring the all wheel drive control module will automatically re-configure the driveline disconnect control module.

Using the Jaguar Land Rover approved diagnostic equipment, re-configure the all wheel drive control module with the latest level software. Clear the DTCs, road test the vehicle and retest
If the fault persists, check and install a new driveline disconnect control module as necessary