Home >> Land Rover >> 2015 >> Range Rover Autobiography >> Repair and Diagnosis >> General Information >> DTC Index >> Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) >> Description And Operation >> DTC B0021-13: Left Curtain Deployment Control 1 - Circuit open >> Possible Causes