Home › Jaguar › 2012 › XJ Base › Repair and Diagnosis › Quick Lookups › DTC Index › Diagnostic Trouble Code Index DTC: Integrated Suspension Control Module -- XJ/X351 › DIAGNOSTIC TROUBLE CODE (DTC) INDEX DTC: Integrated Suspension Control Module › Description And Operation › Integrated Suspension Control Module (ISCM) › DTC C1B18-2F: Module Power Supplies - Signal erratic › Possible Causes