Home › Land Rover › 2021 › Defender 90 › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Instrument Panel Cluster (IPC) Control Module -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Instrument Panel Cluster (IPC) Control Module (G2400899) › Description And Operation › Instrument Panel Cluster (IPC) Control Module › DTC B100D-64: Column Lock Authorization - Signal plausibility failure › Possible Causes