Home › Jaguar › 2018 › F-Pace Base › Repair and Diagnosis › Restraints › Restraints Control Systems › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) - F-Pace › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) › Description And Operation › Restraints Control Module (RCM) › DTC B0021-2B: Left Curtain Deployment Control 1 - Signal cross coupled › Possible Causes