WOMS
B code body Medium severity

B2135 Park Brake Applied Warning Lamp Circuit Failure

The OBD2 code B2135 indicates a failure in the circuit responsible for the Park Brake Applied Warning Lamp, suggesting a malfunction in the system that monitors the status of the parking brake

Definition

The OBD2 code B2135 indicates a failure in the circuit responsible for the Park Brake Applied Warning Lamp, suggesting a malfunction in the system that monitors the status of the parking brake

Common causes

  • Faulty park brake switch
  • Damaged wiring or connectors
  • Short circuit in the park brake circuit
  • Open circuit in the park brake circuit
  • Malfunctioning instrument cluster
  • Failed body control module (BCM)
  • Corroded terminals or connections
  • Faulty park brake warning lamp

Common misdiagnoses

  • Faulty park brake switch
  • Wiring issues or shorts in the circuit
  • Malfunctioning instrument cluster
  • Defective brake light switch
  • Issues with the body control module (BCM)
  • Low brake fluid level
  • Faulty parking brake actuator
  • Problems with the ABS module

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the park brake warning lamp circuit. This can provide insights into the wiring diagrams and component locations

  2. 2. Visual Inspection

    Wiring and Connectors: Inspect the wiring and connectors associated with the park brake system for any signs of damage, corrosion, or loose connections

  3. 3. Park Brake Switch

    Check the park brake switch for proper operation and ensure it is not stuck or damaged

  4. 4. Scan Tool Diagnosis

    Use an OBD-II scanner to read the code and any related codes. This can provide additional context for the issue

  5. 5. Clear the code and see if it returns after a short drive. If it does, further investigation is needed

  6. 6. Test the Park Brake Switch

    Functionality: Test the park brake switch to ensure it is functioning correctly. You can do this by checking for continuity when the park brake is applied and released

  7. 7. Voltage Check

    Use a multimeter to check for voltage at the switch and ensure it is sending the correct signal to the warning lamp circuit

  8. 8. Inspect the Warning Lamp Circuit

    Check the circuit that connects the park brake switch to the warning lamp. Look for any breaks, shorts, or poor connections

  9. 9. Test the warning lamp itself to ensure it is operational. Replace it if it is burned out

  10. 10. Check for Ground Issues

    Ensure that the ground connections for the park brake warning lamp circuit are secure and free of corrosion. A poor ground can cause circuit failures

  11. 11. Examine Related Components

    If applicable, check other components that may be linked to the park brake system, such as the ABS module or any related sensors

  12. 12. Perform a System Reset

    After making any repairs, reset the system by clearing the codes and performing a test drive to see if the issue persists

  13. 13. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the park brake system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

  14. 14. Seek Professional Help

    If the issue persists after performing these steps, consider consulting a professional mechanic or technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B2135 code