DTC U0439: Invalid Data Received from the All Terrain Control Module: Action

This DTC sets if the hill descent control request or the terrain mode request messages from the AWD module contains invalid data. RETRIEVE and DIAGNOSE all AWD module DTCs. REFER to appropriate Manual Transmission, Clutch and Transfer Case article. If no DTCs are set in the AWD module, the condition 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.