Home › Land Rover › 2017 › Discovery SE › Repair and Diagnosis › Restraints › Restraints Control Systems › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) -- Discovery/L462 › Diagnostic Trouble Code Index DTC: Restraints Control Module (RCM) › Description And Operation › DTC B0091-56: Left Side Restraints Sensor 1 - Invalid/incomplete configuration › Possible Causes