WOMS
C code chassis Medium severity

C1172 Park Brake Switch # 1 Applied Circuit Failure

The OBD2 code C1172 indicates a malfunction in the Park Brake Switch # 1 circuit, specifically that the switch is not functioning correctly or is not detecting the applied state as expected

Definition

The OBD2 code C1172 indicates a malfunction in the Park Brake Switch # 1 circuit, specifically that the switch is not functioning correctly or is not detecting the applied state as expected

Common causes

  • Faulty park brake switch
  • Damaged wiring or connectors
  • Short circuit in the park brake circuit
  • Open circuit in the park brake circuit
  • Corroded terminals
  • Faulty brake control module
  • Poor ground connection

Common misdiagnoses

  • Faulty park brake switch
  • Wiring issues or shorts in the circuit
  • Malfunctioning brake control module
  • Defective brake pedal position sensor
  • Issues with the vehicle's body control module
  • Low brake fluid level or brake system issues
  • Faulty connectors or terminals in the circuit
  • Problems with the parking brake assembly or mechanism

Troubleshooting steps

  1. 1. Visual Inspection

    Check the Park Brake Switch: Inspect the park brake switch for any visible damage, corrosion, or loose connections

  2. 2. Wiring and Connectors

    Look for damaged wiring, frayed wires, or poor connections in the circuit leading to the park brake switch

  3. 3. Check the Park Brake Operation

    Functionality: Ensure that the park brake is functioning correctly. Engage and disengage the park brake to see if the switch operates as expected

  4. 4. Switch Position

    Make sure the switch is not stuck in the "applied" position

  5. 5. Test the Park Brake Switch

    Multimeter Testing: Use a multimeter to test the park brake switch. Check for continuity when the switch is engaged and disengaged

  6. 6. Voltage Check

    Measure the voltage at the switch connector to ensure it is receiving the correct voltage

  7. 7. Inspect Related Components

    Brake System: Check the brake system for any issues that might affect the park brake switch, such as low brake fluid or malfunctioning brake components

  8. 8. ABS Module

    If applicable, inspect the ABS module and its connections, as the park brake switch may be integrated with the ABS system

  9. 9. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  10. 10. Clear Codes and Test Drive

    Clear the Code: After performing the above checks and repairs, clear the code using an OBD-II scanner

  11. 11. Test Drive

    Take the vehicle for a test drive to see if the code reappears. Monitor the park brake operation during the drive

  12. 12. Professional Diagnosis

    Seek Professional Help: If you are unable to resolve the issue, consider taking the vehicle to a qualified mechanic or dealership for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the C1172 code. Always ensure safety precautions are taken when working on vehicle electrical systems