WOMS
U code network High severity

U2699 Lost Communication with Vehicle Dynamics Control Module

The OBD2 code U2699 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 U2699 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 lines (CAN bus issues)
  • Software or firmware issues in the VDCM
  • Malfunctioning related sensors (e.g., wheel speed sensors)
  • Battery or power supply issues affecting the VDCM
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty ABS module
  • Defective wheel speed sensors
  • Malfunctioning engine control module (ECM)
  • Wiring issues or shorts in the communication lines
  • Bad ground connections
  • Faulty powertrain control module (PCM)
  • Incorrectly diagnosed transmission issues
  • Battery or charging system problems
  • Faulty or corroded connectors
  • Software or firmware issues in the vehicle's control modules

Troubleshooting steps

  1. 1. Check for Other Codes

    Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or indicate related issues

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with 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 electronic 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 specific make and model of your vehicle. Manufacturers may have issued guidance on common issues related to the VDCM

  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

  14. 14. Document Findings

    Keep a record of any tests performed, findings, and repairs made. This documentation can be helpful for future reference or if you need to consult a professional. By following these steps, you should be able to identify the root cause of the U2699 code and take appropriate action to resolve the communication issue with the Vehicle Dynamics Control Module