Home › Jaguar › 2017 › XE Base, 2.0L Eng VIN G › Repair and Diagnosis › Engine Performance › System › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- XE (X760) › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) › Description And Operation › Restraints Control Module (RCM) › DTC B0021-1A: Left Curtain Deployment Control 1 - Circuit resistance below threshold › Possible Causes