WOMS
C code chassis Medium severity

C1145 Speed Wheel Sensor RF Input Circuit Failure

The OBD2 code C1145 indicates a failure in the input circuit of the right front speed wheel sensor, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Definition

The OBD2 code C1145 indicates a failure in the input circuit of the right front speed wheel sensor, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Common causes

  • Faulty speed wheel sensor
  • Damaged wiring or connectors
  • Poor electrical connections
  • Corroded terminals
  • Sensor misalignment
  • Faulty ABS control module
  • Interference from other electronic components
  • Mechanical issues with the wheel assembly

Common misdiagnoses

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

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. Visual Inspection

    Inspect the wiring and connectors associated with the right front wheel speed sensor. Look for

  3. 3. Damaged or frayed wires

  4. 4. Corroded or loose connectors

  5. 5. Signs of moisture or dirt ingress

  6. 6. Sensor Testing

    Resistance Check: Disconnect the wheel speed sensor and measure its resistance using a multimeter. Compare the reading to the manufacturer's specifications

  7. 7. Signal Check

    With the sensor connected, use a multimeter or oscilloscope to check for an AC voltage signal while the wheel is turned. This indicates that the sensor is functioning correctly

  8. 8. Check the ABS Module

    Inspect the ABS control module for any signs of damage or corrosion. Ensure that the module is receiving power and ground

  9. 9. Inspect the Tone Ring

    Check the tone ring (or reluctor ring) on the right front wheel for any damage or debris. A damaged tone ring can lead to incorrect readings from the wheel speed sensor

  10. 10. Wiring Continuity Test

    Perform a continuity test on the wiring between the wheel speed sensor and the ABS module. Look for any breaks or shorts in the wiring

  11. 11. Check for Ground Issues

    Ensure that the ground connections for the wheel speed sensor and ABS module are secure and free of corrosion

  12. 12. Test Drive

    After performing repairs or replacements, take the vehicle for a test drive to see if the code returns. Monitor the ABS and traction control systems to ensure they are functioning properly

  13. 13. Clear Codes and Recheck

    Clear the trouble codes using the OBD-II scanner and recheck for any codes after the test drive

  14. 14. 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 and traction control systems.Additional Notes: - Always refer to the vehicle's service manual for specific diagnostic procedures and specifications. - Safety precautions should be taken when working on vehicles, especially when dealing with braking systems. By following these steps, you should be able to identify and resolve the issue related to the C1145 code