WOMS
U code network Medium severity

U1406 Invalid Data Received from Anti-lock Brake System (ABS) Control Module

The OBD2 code U1406 indicates that the vehicle's control module has received invalid or erroneous data from the Anti-lock Brake System (ABS) control module, which may affect the vehicle's performance or safety systems

Definition

The OBD2 code U1406 indicates that the vehicle's control module has received invalid or erroneous data from the Anti-lock Brake System (ABS) control module, which may affect the vehicle's performance or safety systems

Common causes

  • Faulty ABS control module
  • Corrupted or damaged wiring/connectors
  • Poor ground connections
  • Faulty communication between modules
  • Software issues or outdated firmware
  • Malfunctioning wheel speed sensors
  • Low battery voltage or electrical issues
  • Intermittent faults in the ABS system

Common misdiagnoses

  • Faulty ABS control module
  • Wiring issues or short circuits
  • Faulty wheel speed sensors
  • Incorrectly calibrated or malfunctioning speedometer
  • Issues with the engine control module (ECM)
  • Problems with the traction control system
  • Faulty brake pedal position sensor
  • Incorrectly installed or damaged brake components

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Codes related to the ABS or other systems can provide additional context

  2. 2. Inspect Wiring and Connectors

    Visual Inspection: Check the wiring and connectors between the ABS module and the vehicle’s computer (ECM). Look for 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 the ABS Module

    Functionality: Verify that the ABS module is functioning correctly. This may involve checking for proper operation of the ABS system during a test drive

  5. 5. Power and Ground

    Ensure that the ABS module is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity

  6. 6. Inspect the CAN Bus

    Communication Issues: Since U1406 is a communication-related code, check the Controller Area Network (CAN) bus for issues. Look for shorts, opens, or other faults in the wiring

  7. 7. Termination Resistors

    Ensure that the CAN bus termination resistors are present and functioning correctly

  8. 8. Scan Tool Data

    Use a scan tool to monitor live data from the ABS module. Look for any unusual readings or data that does not make sense

  9. 9. Check for communication between the ABS module and other modules (like the ECM) to see if data is being transmitted correctly

  10. 10. Reset the Codes

    Clear the trouble codes using the scan tool and take the vehicle for a test drive to see if the code returns. Sometimes, a temporary glitch can cause a code to set

  11. 11. Check for Software Updates

    Verify if there are any software updates available for the ABS module or the vehicle’s ECM. Manufacturers sometimes release updates to fix known issues

  12. 12. Inspect Related Components

    Check other components related to the ABS system, such as wheel speed sensors, brake pedal position sensors, and hydraulic control units, for faults

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the ABS system or the specific vehicle make and model. Manufacturers may have documented solutions for known issues

  14. 14. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or a dealership. They may have specialized diagnostic tools and experience with the specific vehicle.Conclusion Troubleshooting the U1406 code involves a systematic approach to check for communication issues between the ABS module and the vehicle’s computer. By following these steps, you can identify the root cause of the problem and take appropriate action to resolve it