Home >> Land Rover >> 2013 >> Range Rover Evoque Pure >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) -- Range Rover EVOQUE/L538 >> Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) >> Description And Operation >> DTC U2109-91: Back-up Battery - Parametric >> Possible Causes