Home >> Jaguar >> 2012 >> XJ Base >> Repair and Diagnosis (Single Page) >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code (DTC) Index DTC: Rear Differential Control Module (RDCM) -- XJ/X351 >> DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Rear Differential Control Module (RDCM) >> Description And Operation >> Rear Differential Control Module (RDCM) >> P18A8-74 Differential Actuator Brake Control - Actuator slipping >> Possible Causes