WOMS
C code chassis Medium severity

C1287 Booster Pedal Force switch circuit Failure

The OBD2 code C1287 indicates a failure in the booster pedal force switch circuit, which is responsible for detecting the force applied to the brake pedal.

Definition

The OBD2 code C1287 indicates a failure in the booster pedal force switch circuit, which is responsible for detecting the force applied to the brake pedal. This can affect the vehicle's braking system performance

Common causes

  • Faulty booster pedal force switch
  • Damaged wiring or connectors in the circuit
  • Corrosion or poor connections in the electrical system
  • Malfunctioning brake booster
  • Issues with the vehicle's electronic control unit (ECU)
  • Faulty brake pedal position sensor
  • Software glitches or calibration issues in the ABS system

Common misdiagnoses

  • Faulty brake booster
  • Malfunctioning brake pedal position sensor
  • Defective ABS module
  • Wiring issues or shorts in the circuit
  • Faulty brake light switch
  • Incorrectly calibrated brake system
  • Low brake fluid level or contamination
  • Issues with the power brake assist 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 other issues present

  2. 2. Inspect the Brake Pedal Force Sensor

  3. 3. Locate the brake pedal force sensor and inspect it for any visible damage or disconnection

  4. 4. Ensure that the sensor is properly connected and that the wiring harness is intact

  5. 5. Test the Brake Pedal Force Sensor

  6. 6. Use a multimeter to test the sensor's resistance and voltage output according to the manufacturer's specifications

  7. 7. If the readings are outside the specified range, the sensor may need to be replaced

  8. 8. Check Wiring and Connectors

  9. 9. Inspect the wiring and connectors leading to the brake pedal force sensor for any signs of wear, corrosion, or damage

  10. 10. Repair or replace any damaged wiring or connectors

  11. 11. Inspect the Brake Booster

  12. 12. Check the brake booster for any signs of vacuum leaks or damage

  13. 13. Ensure that the brake booster is functioning properly, as issues here can affect the pedal force sensor

  14. 14. Examine the Brake System

  15. 15. Inspect the entire brake system for any issues, including brake fluid levels, brake lines, and calipers

  16. 16. Ensure that the brake system is functioning correctly and that there are no leaks

  17. 17. Clear the Codes

    After performing the above checks 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

  18. 18. Consult the Service Manual

    If the issue persists, refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the brake pedal force switch circuit

  19. 19. Seek Professional Help

    If you are unable to diagnose or resolve the issue, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and address the cause of the C1287 code