Home › Jaguar › 2017 › XJR Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code (DTC) Index DTC: Power Steering Control Module (PSCM) -- XJ/X351 › DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Power Steering Control Module (PSCM) › Description And Operation › Power Steering Control Module (PSCM) › U0300-56 Internal Control Module Software Incompatibility - Invalid/incomplete configuration › Possible Causes