Home >> Land Rover >> 2022 >> Range Rover Sport Autobiography >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- Range Rover Sport/L494 >> Diagnostic Trouble Code Index - DTC: Restraints Control Module (RCM) (G2187652) >> Description And Operation >> Restraints Control Module (RCM) >> DTC B0021-2B: Left Curtain Deployment Control 1 - Signal cross coupled >> Possible Causes