WOMS
U code network Medium severity

U1402 Invalid Data Received from Anti-lock Brake System (ABS) Control Module

The OBD2 code U1402 indicates that the vehicle's control module has received invalid or erroneous data from the Anti-lock Brake System (ABS) control module

Definition

The OBD2 code U1402 indicates that the vehicle's control module has received invalid or erroneous data from the Anti-lock Brake System (ABS) control module

Common causes

  • Faulty ABS control module
  • Corrupted data communication
  • Damaged wiring or connectors
  • Faulty wheel speed sensors
  • Low battery voltage
  • Software issues or updates needed
  • Grounding issues in the ABS system
  • Intermittent electrical connections

Common misdiagnoses

  • Faulty ABS Control Module
  • Wiring issues or short circuits
  • Faulty wheel speed sensors
  • Incorrectly calibrated or faulty speedometer
  • Issues with the Engine Control Module (ECM)
  • Problems with the powertrain control module (PCM)
  • Faulty brake pedal position sensor
  • Incorrectly installed or damaged ABS pump
  • Software or firmware issues in the ABS module
  • Battery or charging system problems

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 related to the ABS control module for any 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 Control Module

    Functionality: Verify that the ABS control module is functioning correctly. This may involve checking for proper power and ground at the module

  5. 5. Reprogramming

    In some cases, the ABS module may need to be reprogrammed or updated

  6. 6. Inspect the CAN Bus

    Since U1402 is a communication-related code, check the Controller Area Network (CAN) bus for issues. Look for

  7. 7. Short circuits

  8. 8. Open circuits

  9. 9. Faulty modules on the bus

  10. 10. Use a multimeter or oscilloscope to check for proper voltage levels and signal integrity on the CAN lines

  11. 11. Check for Ground Issues

    Ensure that the ABS module has a good ground connection. Poor grounding can lead to communication errors

  12. 12. Test the ABS Module

    If possible, perform a bench test on the ABS control module to ensure it is functioning correctly. This may require specialized equipment

  13. 13. Clear Codes and Test Drive

    After performing inspections 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

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the ABS system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  15. 15. 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 ABS systems and can perform more advanced diagnostics

  16. 16. Consider Module Replacement

    If all else fails and the ABS control module is determined to be faulty, replacement may be necessary.Conclusion Troubleshooting OBD-II code U1402 involves a systematic approach to identify and resolve communication issues between the ABS control module and the vehicle's computer systems. Always ensure safety and follow manufacturer guidelines when working on vehicle electronics