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U code network Medium severity

U1420 Invalid Data Received from Vehicle Dynamics Control Module

The OBD2 code U1420 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 U1420 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 faulty wiring/connectors
  • Poor ground connections
  • Malfunctioning sensors (e.g., wheel speed sensors)
  • Software issues or bugs in the VDCM
  • Communication issues between modules
  • Low battery voltage or electrical system problems
  • Faulty or damaged ABS module

Common misdiagnoses

  • Faulty ABS module
  • Incorrect wheel speed sensor readings
  • Malfunctioning traction control system
  • Defective vehicle dynamics control module
  • Wiring issues or poor connections
  • Faulty powertrain control module (PCM)
  • Incorrectly calibrated sensors
  • Software issues or outdated firmware

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help in diagnosing the issue

  2. 2. Inspect Wiring and Connectors

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

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

  4. 4. Check for Ground Issues

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

  5. 5. Test the Vehicle Dynamics Control Module

    If possible, test the VDCM for proper operation. This may involve using a scan tool to check for live data and ensuring that the module is functioning correctly

  6. 6. If the VDCM is faulty, it may need to be repaired or replaced

  7. 7. Inspect Related Sensors

    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 correctly and that their wiring is intact

  8. 8. Check for Software Updates

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

  9. 9. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  10. 10. Perform a Network Test

    If the code persists, perform a network test to check for communication issues between modules. This may require specialized diagnostic equipment

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the U1420 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  12. 12. Seek Professional Help

    If you are unable to resolve the issue after performing these steps, consider seeking help from a qualified mechanic or dealership. They may have access to advanced diagnostic tools and expertise. By following these troubleshooting steps, you can systematically identify and resolve the underlying issue causing the U1420 code