Home >> Jaguar >> 2017 >> XJ Supercharged >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code (DTC) Index DTC: TELEMATIC Control Module (TCU) -- XJ/X351 >> Diagnostic Trouble Code (DTC) Index DTC: Telematic Control Module (TCU) >> Description And Operation >> TELEMATIC Control Module (TCU) >> B117A-12 Backup Microphone - Circuit short to battery >> Possible Causes