WOMS
U code network Medium severity

U1426 Invalid Data Received from Vehicle Dynamics Control Module

The OBD2 code U1426 indicates that the vehicle's control module has received invalid or erroneous data from the Vehicle Dynamics Control Module, which may affect the vehicle's stability and handling systems

Definition

The OBD2 code U1426 indicates that the vehicle's control module has received invalid or erroneous data from the Vehicle Dynamics Control Module, which may affect the vehicle's stability and handling systems

Common causes

  • Faulty Vehicle Dynamics Control Module (VDCM)
  • Corrupted or damaged data communication lines
  • Poor electrical connections or wiring issues
  • Software or firmware issues in the VDCM
  • Faulty sensors related to vehicle dynamics
  • Issues with the Engine Control Module (ECM) or other related modules
  • Low battery voltage or power supply issues
  • Interference from aftermarket modifications or devices

Common misdiagnoses

  • Faulty ABS module
  • Defective wheel speed sensors
  • Malfunctioning traction control system
  • Issues with the powertrain control module (PCM)
  • Wiring or connector problems
  • Faulty vehicle dynamics control module (VDCM)
  • Incorrect tire sizes or pressures
  • Software or calibration issues in the control modules

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

  3. 3. Visually inspect the wiring and connectors between the ECM and the VDCM for any signs of damage, corrosion, or loose connections

  4. 4. Ensure that all connectors are securely plugged in and that there are no bent pins

  5. 5. Check for Software Updates

  6. 6. Verify if there are any software updates available for the ECM or VDCM. Sometimes, manufacturers release updates to fix communication issues

  7. 7. Test the Vehicle Dynamics Control Module

  8. 8. If possible, test the VDCM to ensure it is functioning correctly. This may involve using a scan tool to check for live data and see if the module is responding as expected

  9. 9. Inspect Related Sensors

  10. 10. Check the sensors that provide data to the VDCM, such as wheel speed sensors, steering angle sensors, and yaw rate sensors. Ensure they are functioning properly and that their wiring is intact

  11. 11. Perform a Hard Reset

  12. 12. Disconnect the vehicle's battery for a few minutes to reset the ECM and VDCM. Reconnect the battery and see if the code reappears

  13. 13. Check for Ground Issues

  14. 14. Ensure that the ground connections for both the ECM and VDCM are secure and free of corrosion. Poor grounding can lead to communication issues

  15. 15. Scan for Communication Issues

  16. 16. Use a scan tool to check the communication between the ECM and VDCM. Look for any communication errors or timeouts

  17. 17. Consult Technical Service Bulletins (TSBs)

  18. 18. Check for any TSBs related to the U1426 code for your specific vehicle make and model. Manufacturers may have documented common issues and fixes

  19. 19. Replace Faulty Components

  20. 20. If you identify a faulty VDCM or related sensor, replace it and clear the codes. Monitor the system to see if the code returns. 1

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing complex vehicle communication issues. By following these steps, you should be able to identify and resolve the underlying cause of the U1426 code