DTC U2109-09: Back-up Battery - Component failures: Action
WARNING: This page is about a different car, the 2021 Land Rover Range Rover Sport, 2020 Land Rover Range Rover Sport, and 2019 Land Rover Range Rover Sport. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Following an emergency call or stolen vehicle tracking alert, a new telematic control unit module internal battery must be installed before this DTC can be cleared
- Check backup battery for poor connection or not connected
- Refer to the appropriate service information and check the telematic control unit module internal battery circuit for open circuit, high resistance. Repair the wiring harness as necessary
- Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and perform routine - Test Internal Backup Battery (0x040C). If the fault persists, install a new telematic control unit module internal battery. Using the Jaguar Land Rover approved diagnostic equipment, reset the non-rechargeable battery power level following the backup battery replacement process