DTC U201F-31: External Receiver - No signal: Action

NOTE: This DTC is only reported through the On Demand Self Test (0x0202)

Refer to the appropriate system wiring diagrams and check the Radio Frequency (RF) receiver K-line bus circuit for open circuit, high resistance. Repair the wiring harness as necessary
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest. Perform routine - On Demand Self Test (0x0202). If the fault persists, install a new Radio Frequency (RF) receiver