DTC U1A4B-9A: Control Module Processor B - Component or system operating conditions: Action

Refer to the appropriate system wiring diagrams and check the transfer case control module power and ground circuits for open circuit, high resistance. Repair circuit as required, clear DTC and retest
Using the Jaguar Land Rover approved diagnostic equipment, check for voltage related DTCs and refer to the relevant DTC index. Refer to the relevant section of the service information and test the battery and charging system
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