DTC U0405-84 Invalid Data Received From Cruise Control Module - Signal below allowable range: Action

NOTE: The FlexRay wiring harness must not be repaired by making a localised wiring repair. A new wiring harness should be installed.

Refer to the appropriate system wiring diagrams and check the adaptive cruise control module power and ground circuits for open circuit, high resistance. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, perform a CAN network integrity test. Refer to the appropriate system wiring diagrams and check the high speed CAN bus (chassis) circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
Refer to the appropriate system wiring diagrams and check the FlexRay bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, check the adaptive cruise control module for related Diagnostic Trouble Code(s) and refer to the relevant DTC index