DTC U2000-4B: Motor Temperature - Over temperature: Action

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, 2016 Land Rover Range Rover, 2015 Land Rover Range Rover, and 2014 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This DTC is set when the temperature of the differential locking motor exceeds 150°C.
This DTC may be induced by excessive electric differential clutch operation due to prolonged off road or track driving.
If other differential locking motor brake DTCs are set, perform the corrective actions for those DTCs first and retest.
After installing a new rear differential control module, differential locking motor or electric differential, clear the DTCs and calibrate the system by performing routine - On Demand Self Test.

Refer to the appropriate system wiring diagrams and check the differential locking motor brake circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new differential locking motor as necessary
Using the Jaguar Land Rover Approved Diagnostic Equipment, clear the DTCs and perform routine - On Demand Self Test. If the fault persists, install a new differential locking motor