Home › Land Rover › 2021 › Defender 110 X-Dynamic SE › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Transfer Case Control Module (TCCM) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Transfer Case Control Module (TCCM) (G2400921) › Description And Operation › Transfer Case Control Module (TCCM) › DTC P18A5-03: Motion/Position Sensor "A" Signal Circuit - FM (Frequency Modulated)/PWM (Pulse Width Modulated) failures › Possible Causes