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C1279 Yaw Rate Sensor circuit Failure

The OBD2 code C1279 indicates a failure in the yaw rate sensor circuit, which is responsible for measuring the vehicle's rotational movement around its vertical axis

Definition

The OBD2 code C1279 indicates a failure in the yaw rate sensor circuit, which is responsible for measuring the vehicle's rotational movement around its vertical axis

Common causes

  • Faulty yaw rate sensor
  • Wiring issues (shorts, opens, or corrosion)
  • Poor connections or loose connectors
  • Malfunctioning vehicle stability control system
  • Software or calibration issues
  • Power supply problems to the sensor
  • Physical damage to the sensor or mounting area

Common misdiagnoses

  • ABS module failure
  • Steering angle sensor malfunction
  • Wheel speed sensor issues
  • Traction control system faults
  • Electronic stability control (ESC) problems
  • Wiring or connector issues
  • Faulty brake system components
  • Powertrain control module (PCM) errors

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Yaw Rate Sensor

    Physical Inspection: Locate the yaw rate sensor and inspect it for any visible damage, corrosion, or loose connections

  3. 3. Wiring and Connectors

    Check the wiring harness and connectors for fraying, breaks, or poor connections. Ensure that the connectors are securely attached

  4. 4. Test the Yaw Rate Sensor

    Voltage and Ground: Use a multimeter to check the voltage supply and ground at the yaw rate sensor connector. Compare the readings with the specifications in the vehicle’s service manual

  5. 5. Sensor Output

    If possible, test the output signal of the yaw rate sensor while the vehicle is in motion to see if it responds correctly to changes in vehicle dynamics

  6. 6. Check the ABS Module

    Since the yaw rate sensor is often integrated with the ABS system, check the ABS module for any faults. Inspect the ABS wiring and connectors as well

  7. 7. Inspect Related Components

    Check other components that may affect the yaw rate sensor, such as the steering angle sensor, wheel speed sensors, and the vehicle stability control system

  8. 8. 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

  9. 9. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the yaw rate sensor or stability control system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues

  10. 10. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized diagnostic tools and experience with your vehicle

  11. 11. Replace the Yaw Rate Sensor

    If all tests indicate that the yaw rate sensor is faulty, replacing it may be necessary. Ensure that you use a quality replacement part

  12. 12. Recheck System After Repair

    After replacing the sensor, recheck the system to ensure that the code does not return and that the vehicle's stability control system is functioning correctly. By following these steps, you should be able to diagnose and address the C1279 code effectively. Always refer to the vehicle's service manual for specific procedures and specifications