Home >> Jaguar >> 2017 >> XJR L >> Repair and Diagnosis >> Quick Lookups >> 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) >> B1179-04 Integrated GSM/GPRS Unit - System internal failures >> Possible Causes