WOMS
U code network High severity

U1047 Lost Communication with Vehicle Dynamics Control Module

The OBD2 code U1047 indicates a loss of communication with the Vehicle Dynamics Control Module, which may affect the vehicle's stability and traction control systems

Definition

The OBD2 code U1047 indicates a loss of communication with the Vehicle Dynamics Control Module, which may affect the vehicle's stability and traction control systems

Common causes

  • Faulty Vehicle Dynamics Control Module (VDCM)
  • Damaged or corroded wiring or connectors
  • Poor ground connection
  • Faulty communication network (CAN bus issues)
  • Malfunctioning power supply to the VDCM
  • Software or firmware issues in the VDCM
  • Other related module failures affecting communication

Common misdiagnoses

  • Faulty ABS module
  • Wiring issues or shorts
  • Faulty wheel speed sensors
  • Malfunctioning engine control module (ECM)
  • Battery or charging system problems
  • Faulty powertrain control module (PCM)
  • Incorrectly installed aftermarket components
  • Corroded connectors or terminals

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, multiple codes can provide more context about the issue

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors related to the Vehicle Dynamics Control Module (VDCM) for any signs of damage, corrosion, or loose connections

  3. 3. Connector Pins

    Ensure that the pins in the connectors are not bent or corroded

  4. 4. Check Power and Ground

    Power Supply: Verify that the VDCM is receiving the correct voltage. Use a multimeter to check the power supply to the module

  5. 5. Ground Connection

    Ensure that the ground connection for the VDCM is secure and functioning properly

  6. 6. Inspect the Vehicle Dynamics Control Module

    Module Condition: Check the VDCM for any physical damage or signs of failure

  7. 7. Reprogramming

    If applicable, consider reprogramming or updating the module’s software, as a software glitch can sometimes cause communication issues

  8. 8. Check for Communication Issues

    CAN Bus Communication: Since the VDCM communicates over the CAN bus, check for issues with the CAN network. Look for other modules that may not be communicating properly

  9. 9. Scan Other Modules

    Use a scan tool to check if other modules are communicating correctly. If other modules are also showing communication errors, the issue may be with the CAN bus itself

  10. 10. Perform a Hard Reset

    Disconnect the vehicle's battery for a few minutes to reset the vehicle's computer systems. Reconnect and see if the code reappears

  11. 11. Check for Environmental Factors

    Ensure that there are no environmental factors affecting the module, such as moisture or extreme temperatures

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the VDCM

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle

  14. 14. Replace the Module (if necessary)

    If all other troubleshooting steps fail and the VDCM is determined to be faulty, replacement of the module may be necessary.Conclusion Always ensure safety when working on vehicles, and if you're unsure about any step, consult a professional. Proper diagnosis is key to resolving communication issues effectively