DTC U3006-85: Control Module Input Power "A" - Signal above allowable range: Action

WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.

Using Jaguar Land Rover approved diagnostic equipment, perform the Transfer Case Healthcheck Application. The application will subsequently test the system and report a DTC if a fault persists
Refer to the electrical circuit diagrams and check the transfer case control module power and ground circuits for short circuit to ground. Repair circuit as required, clear DTC and retest
Using Jaguar Land Rover approved diagnostic equipment, check datalogger signals - Main ECU Voltage Supply (0xDD02) and Control Module Voltage (0xF442). Refer to the relevant section of the workshop manual and test the battery and charging system