WOMS
P code powertrain Medium severity

P0571 Brake Switch Range/Performance Problem

The OBD2 code P0571 indicates a malfunction in the brake switch circuit, specifically related to the range or performance of the brake switch, which may affect the vehicle's braking system and related functions

Definition

The OBD2 code P0571 indicates a malfunction in the brake switch circuit, specifically related to the range or performance of the brake switch, which may affect the vehicle's braking system and related functions

Common causes

  • Faulty brake light switch
  • Misadjusted brake light switch
  • Damaged wiring or connectors
  • Faulty brake pedal position sensor
  • Malfunctioning cruise control system
  • Issues with the vehicle's powertrain control module (PCM)

Common misdiagnoses

  • Faulty brake switch
  • Wiring issues or shorts in the brake switch circuit
  • Malfunctioning cruise control system
  • ABS module problems
  • Faulty engine control module (ECM)
  • Transmission range sensor issues
  • Incorrectly adjusted brake pedal
  • Faulty throttle position sensor

Troubleshooting steps

  1. 1. Check the Brake Light Switch:

    Visual Inspection: Inspect the brake light switch for any physical damage or misalignment. Ensure that it is properly mounted and that the plunger is not stuck

  2. 2. Functionality Test

    Press the brake pedal and check if the brake lights illuminate. If they do not, the switch may be faulty

  3. 3. Inspect Wiring and Connectors:

    Wiring Inspection: Check the wiring harness and connectors associated with the brake switch for any signs of damage, corrosion, or loose connections

  4. 4. Continuity Test

    Use a multimeter to test for continuity in the wiring. Ensure that there are no breaks in the circuit

  5. 5. Check for Faulty Brake Light Bulbs:

    Ensure that the brake light bulbs are functioning correctly. A burned-out bulb can sometimes cause issues with the brake switch circuit

  6. 6. Scan for Additional Codes:

    Use an OBD-II scanner to check for any other related trouble codes. This can provide additional context and help identify if there are other issues present

  7. 7. Inspect the Brake Pedal Assembly:

    Ensure that the brake pedal is not obstructed and that it returns to its resting position properly. A sticking pedal can affect the brake switch operation

  8. 8. Test the Brake Switch Circuit:

    If the brake switch appears to be functioning, test the voltage and ground at the switch using a multimeter. Ensure that the switch receives power and that the ground is solid

  9. 9. Check for Software Updates:

    In some cases, a software update from the manufacturer may resolve issues related to the brake switch. Check with the dealership for any available updates

  10. 10. Clear the Code and Test Drive:

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

  11. 11. Consult a Professional:

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis. They may have specialized tools and knowledge to identify more complex issues. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0571 code