WOMS
C code chassis Medium severity

C1259 Speed Wheel RF Comparison Failure

The OBD2 code C1259 indicates a failure in the comparison of the right front wheel speed sensor data, suggesting a discrepancy between the readings of the right front wheel speed sensor and the other wheel speed sensors

Definition

The OBD2 code C1259 indicates a failure in the comparison of the right front wheel speed sensor data, suggesting a discrepancy between the readings of the right front wheel speed sensor and the other wheel speed sensors

Common causes

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • Incorrectly installed or misaligned wheel speed sensor
  • ABS control module malfunction
  • Brake system issues
  • Tire size discrepancies
  • Wheel bearing problems
  • Corrosion or dirt on sensor or tone ring

Common misdiagnoses

  • Wheel speed sensor failure
  • ABS module failure
  • Wiring or connector issues
  • Brake system malfunction
  • Tire size mismatch
  • Faulty brake pedal position sensor
  • Incorrectly calibrated ABS system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect Wheel Speed Sensors

  3. 3. Visually inspect the right front wheel speed sensor and its wiring for any signs of damage, corrosion, or disconnection

  4. 4. Ensure that the sensor is properly mounted and that there are no obstructions

  5. 5. Test Wheel Speed Sensor

  6. 6. Use a multimeter to test the resistance of the wheel speed sensor. Compare the readings with the specifications in the vehicle's service manual

  7. 7. If the sensor is a Hall effect type, check for proper voltage and signal output while the wheel is turning

  8. 8. Check Wiring and Connectors

  9. 9. Inspect the wiring harness and connectors leading to the right front wheel speed sensor for any signs of wear, fraying, or corrosion

  10. 10. Ensure that all connections are secure and free of dirt or moisture

  11. 11. Examine the ABS Module

  12. 12. Check the ABS control module for any signs of damage or corrosion

  13. 13. Ensure that the module is receiving power and ground as specified in the service manual

  14. 14. Test the ABS System

  15. 15. If equipped, use a scan tool to perform an ABS system test. This may include activating the ABS pump and checking for proper operation

  16. 16. Look for any other ABS-related codes that may indicate a broader issue

  17. 17. Check for Mechanical Issues

  18. 18. Inspect the brake components, including the brake rotor and caliper, for any signs of binding or mechanical failure that could affect wheel speed readings

  19. 19. Ensure that the wheel bearings are in good condition and not causing excessive play

  20. 20. Clear Codes and Test Drive

  21. 21. After performing repairs or adjustments, clear the trouble codes using the OBD-II scanner

  22. 22. Take the vehicle for a test drive to see if the code reappears. Monitor the ABS and traction control systems for proper operation

  23. 23. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be necessary to consult a professional mechanic or technician who specializes in ABS systems. By following these steps, you should be able to identify and address the cause of the C1259 code effectively