WOMS
C code chassis Medium severity

C1177 Park Brake Actuator Assembly Switch Released Circuit Failure

The OBD2 code C1177 indicates a malfunction in the park brake actuator assembly switch, specifically that the circuit indicating the switch is released is failing

Definition

The OBD2 code C1177 indicates a malfunction in the park brake actuator assembly switch, specifically that the circuit indicating the switch is released is failing

Common causes

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

Common misdiagnoses

  • Faulty park brake actuator
  • Damaged wiring or connectors
  • Malfunctioning brake switch
  • Issues with the electronic control unit (ECU)
  • Brake fluid level sensor problems
  • Faulty parking brake pedal assembly
  • Incorrectly calibrated brake system
  • Problems with the anti-lock braking system (ABS)

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the park brake actuator and the associated wiring diagrams

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring harness and connectors related to the park brake actuator for any signs of damage, corrosion, or loose connections

  3. 3. Park Brake Assembly

    Check the park brake assembly itself for any physical damage or misalignment

  4. 4. Scan for Additional Codes

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

  5. 5. Test the Park Brake Actuator

    Functionality Test: If possible, manually test the park brake actuator to ensure it operates correctly. This may involve applying and releasing the park brake to see if the actuator responds as expected

  6. 6. Resistance Check

    Measure the resistance of the actuator switch to ensure it is within the manufacturer's specifications

  7. 7. Check the Circuit

    Voltage and Ground: Use a multimeter to check for proper voltage and ground at the actuator switch. Ensure that the circuit is receiving the correct voltage when the park brake is applied and released

  8. 8. Continuity Test

    Perform a continuity test on the wiring to ensure there are no breaks or shorts in the circuit

  9. 9. Inspect the Brake Fluid Level

    Low brake fluid levels can sometimes affect the operation of the park brake system. Ensure that the brake fluid is at the proper level

  10. 10. Check the Brake System

    Inspect the entire brake system for any issues that could affect the park brake operation, including the condition of the brake pads, rotors, and other components

  11. 11. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Additional Considerations

  13. 13. Software Updates

    In some cases, a software update may be required for the vehicle's control modules. Check with the manufacturer for any available updates

  14. 14. Replacement Parts

    If the actuator or switch is found to be faulty, replacement may be necessary. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1177 code