B1B01-64 Key Transponder - Signal plausibility failure: Action

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

Using the Jaguar Land Rover approved diagnostic equipment, perform routine - Immobilization
Refer to the appropriate SYSTEM WIRING DIAGRAMS information and check the remote function actuator 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 information and check the high speed CAN bus (body) 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 remote function actuator for related DTCs and refer to the relevant DTC index