DTC U3006-85: Control Module Input Power "A" - Signal above allowable range: 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 may be set when the vehicle is jump started.

Using the 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 appropriate system wiring 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 the 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 service information and test the battery and charging system