WOMS
C code chassis Medium severity

C1229 Speed Wheel Sensor Rear Center Coherency Fault

The OBD2 code C1229 indicates a coherency fault in the rear center speed wheel sensor, suggesting a discrepancy in the speed readings from the sensor compared to other wheel speed sensors

Definition

The OBD2 code C1229 indicates a coherency fault in the rear center speed wheel sensor, suggesting a discrepancy in the speed readings from the sensor compared to other wheel speed sensors

Common causes

  • Faulty rear center wheel speed sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Faulty ABS control module
  • Incorrectly installed or misaligned wheel speed sensor
  • Contaminated sensor or reluctor ring
  • Mechanical issues with the rear axle or wheel assembly

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • ABS control module failure
  • Incorrect tire size or pressure
  • Brake system issues
  • Faulty hub assembly
  • Problems with the vehicle's computer system
  • Misalignment or suspension issues

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

    Visual Inspection: Check the rear wheel speed sensors for any visible damage, such as cracks, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors for fraying, corrosion, or disconnection. Ensure that all connections are secure

  4. 4. Test Wheel Speed Sensors

    Resistance Test: Use a multimeter to measure the resistance of the wheel speed sensors. Compare the readings to the manufacturer's specifications

  5. 5. Signal Test

    While the vehicle is in motion, use a scan tool to monitor the wheel speed sensor data. Ensure that the readings from the rear center sensor are consistent with the other wheel sensors

  6. 6. Check for Mechanical Issues

    Brake Components: Inspect the brake components for any issues that could affect the wheel speed sensors, such as damaged rotors or calipers

  7. 7. Wheel Bearings

    Check the wheel bearings for wear or damage, as this can affect sensor readings

  8. 8. Inspect ABS Module

    If the sensors and wiring are in good condition, the issue may lie within the ABS control module. Check for any signs of damage or malfunction

  9. 9. Clear Codes and Test Drive

    After performing inspections and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears

  10. 10. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has experience with ABS systems and OBD-II diagnostics.Additional Tips: - Always ensure that the vehicle is safely supported when working on it. - If you are not comfortable performing these checks, it is advisable to consult a professional mechanic. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1229 code