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Home › Land Rover › 2014 › Range Rover Autobiography › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Telematics Control Module (TCU) -- Range Rover/L405 › Diagnostic Trouble Code Index DTC: Telematics Control Module (TCU) › Description And Operation › DTC U2109-09: Back-up Battery - Component failures › Possible Causes

Possible Causes

Backup battery poor connection or not connected
Telematics control module internal battery circuit open circuit, high resistance
Telematics control module internal battery failure