Home >> Jaguar >> 2012 >> XJ Base >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Transmission Control Module (TCM) -- XJ/X351 >> Diagnostic Trouble Code (DTC) Index DTC: Transmission Control Module (TCM) >> Description And Operation >> Transmission Control Module (TCM) >> DTC U0121-87: Lost Communication With Anti-Lock Brake System (ABS) Control Module - Missing message >> Possible Causes