DTC U0404: Invalid Data Received from Gear Shift Control Module A: Signal Invalid: Action

This DTC sets if the GSM state message or the GSM button quality state is invalid or faulty. Using a diagnostic scan tool, RETRIEVE and DIAGNOSE all GSM DTCs. REFER to Diagnosis and Testing in the EXTERNAL CONTROLS . If no GSM DTCs are present, the DTC may be caused by an intermittent concern. SET the ignition to OFF. DISCONNECT and INSPECT all AWD module electrical connectors and related in-line connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary.