Home >> Land Rover >> 2021 >> Discovery R-Dynamic HSE >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) -- Discovery/L462 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: TELEMATIC Control Module (TCU) (G2058462) >> DTC B117A-13: Backup Microphone - Circuit open >> Possible Causes