Home › Jaguar › 2016 › XF Prestige, AWD › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code Index DTC: TELEMATIC Control Module (TCU) -- XF/X260 › Diagnostic Trouble Code Index DTC: Telematic Control Module (TCU) › Description And Operation › Telematics Control Module (TCU) › DTC B117A-12: Backup Microphone - Circuit short to battery › Possible Causes