Home › Land Rover › 2017 › Discovery SE › Repair and Diagnosis › Steering › Steering Control Systems › Diagnostic Trouble Code Index DTC: Power Steering Control Module (PSCM) -- Discovery/L462 › Diagnostic Trouble Code Index DTC: Power Steering Control Module (PSCM) › Description And Operation › DTC B1304-04: Electronic Power Assisted Steering System - System internal failures › Possible Causes