Home › Jaguar › 2017 › XJR Base › Repair and Diagnosis › General Information › DTC Index › Diagnostic Trouble Code (DTC) Index DTC: Gateway Module -- XJ/X351 › DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Gateway Module › Description And Operation › Gateway Module (GWM) › B11DB-49 Battery Monitoring Module A - Internal electronic failure › Possible Causes