DTC U0404: Action

This DTC sets if the GSM state message or the GSM button quality state is invalid or faulty. RETRIEVE and DIAGNOSE all GSM DTCs. If there are no DTCs in the GSM, the DTC may be caused by an intermittent concern. SET the ignition to OFF. DISCONNECT and INSPECT all GSM electrical connectors and related in-line electrical connectors for corrosion, bent pins, pushed-out pins and spread terminals. REPAIR as necessary.