WOMS
U code network High severity

U1122 Lost Communication with Vehicle Dynamics Control Module

The OBD2 code U1122 indicates a loss of communication between the vehicle's control module and the Vehicle Dynamics Control Module, which may affect systems like traction control and stability control

Definition

The OBD2 code U1122 indicates a loss of communication between the vehicle's control module and the Vehicle Dynamics Control Module, which may affect systems like traction control and stability control

Common causes

  • Faulty Vehicle Dynamics Control Module (VDCM)
  • Damaged or corroded wiring or connectors
  • Poor ground connection
  • Faulty communication lines (CAN bus issues)
  • Malfunctioning or disconnected sensors
  • Software or firmware issues in the VDCM
  • Battery or power supply problems
  • Interference from aftermarket modifications or devices

Common misdiagnoses

  • ABS Module Failure
  • Wheel Speed Sensor Issues
  • Faulty Wiring or Connectors
  • Powertrain Control Module (PCM) Issues
  • Instrument Cluster Malfunction
  • Body Control Module (BCM) Problems
  • Incorrectly Diagnosed Brake System Issues
  • Faulty Traction Control System
  • Software or Firmware Issues
  • Battery or Charging System Problems

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, corroded, or damaged

  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 bus wiring and other modules on the bus

  9. 9. Network Integrity

    Use a scan tool to monitor the CAN bus for any irregularities or communication failures with other modules

  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. Test the Module

    If possible, test the VDCM in another vehicle (if you have access to one) to determine if the module itself is faulty

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U1122 code or the VDCM for your specific vehicle make and model. Manufacturers may have known fixes or updates

  13. 13. Seek Professional Help

    If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your vehicle’s specific systems.Conclusion Troubleshooting a U1122 code involves a systematic approach to check for wiring issues, module functionality, and communication integrity. Always ensure safety precautions are taken when working on vehicle electrical systems