Home >> Land Rover >> 2021 >> Range Rover SVAutobiography Dynamic Blk. >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) -- Range Rover/L405 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: TELEMATIC Control Module (TCU) (G2058462) >> DTC U2109-09: Back-up Battery - Component failures >> Possible Causes