Home › Land Rover › 2021 › Defender 90 › Repair and Diagnosis › General Information › Specifications Index › Diagnostic Trouble Code Index DTC: Power Steering Control Module (PSCM) -- Defender/L663 › Diagnostic Trouble Code Index - DTC: Power Steering Control Module (PSCM) (G2400908) › Description And Operation › Power Steering Control Module (PSCM) › DTC B1304-04: Electronic Power Assisted Steering System - System internal failures › Possible Causes