P0572: Brake Switch Low Input

Definition

The OBD2 code P0572 indicates that the brake switch input signal is lower than expected, which may suggest a malfunction in the brake switch or its circuit

Common causes

Faulty brake light switch
Wiring issues (shorts or open circuits)
Poor electrical connections
Malfunctioning brake pedal assembly
Faulty engine control module (ECM) or powertrain control module (PCM)

Common misdiagnoses

Faulty brake switch
Wiring issues or shorts in the brake switch circuit
Malfunctioning cruise control system
ABS module failure
Faulty engine control module (ECM)
Brake pedal assembly issues
Problems with the transmission range sensor

Troubleshooting steps

1. Check the Brake Light Switch
2. Inspect the brake light switch located near the brake pedal. Ensure it is properly mounted and not damaged
3. Test the switch for continuity using a multimeter. When the brake pedal is pressed, the switch should close and show continuity
4. Inspect Wiring and Connectors
5. Check the wiring and connectors leading to the brake light switch for any signs of damage, corrosion, or loose connections
6. Look for frayed wires or broken connectors that could cause an intermittent signal
7. Test the Brake Lights
8. Verify that the brake lights are functioning correctly. If the brake lights do not illuminate when the pedal is pressed, the switch may be faulty
9. If the brake lights are not working, check the bulbs and fuses related to the brake light circuit
10. Check for Faulty Modules
11. Some vehicles have multiple modules that can affect the brake switch input. Check for any related fault codes in other modules (e.g., ABS, BCM) that may provide additional context
12. Inspect the Fuse
13. Locate and inspect the fuse associated with the brake light circuit. Replace any blown fuses and check if the code returns
14. Scan for Additional Codes
15. Use an OBD-II scanner to check for any additional trouble codes that may be related to the brake system or other components
16. Clear the Code and Test Drive
17. After performing the above checks and repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
18. Consult the Vehicle Manual
19. Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the brake switch and associated circuits
20. Seek Professional Help
21. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair. By following these steps, you should be able to identify and resolve the issue related to the P0572 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Brake Light Switch

2. Inspect the brake light switch located near the brake pedal. Ensure it is properly mounted and not damaged

3. Test the switch for continuity using a multimeter. When the brake pedal is pressed, the switch should close and show continuity

4. Inspect Wiring and Connectors

5. Check the wiring and connectors leading to the brake light switch for any signs of damage, corrosion, or loose connections

6. Look for frayed wires or broken connectors that could cause an intermittent signal

7. Test the Brake Lights

8. Verify that the brake lights are functioning correctly. If the brake lights do not illuminate when the pedal is pressed, the switch may be faulty

9. If the brake lights are not working, check the bulbs and fuses related to the brake light circuit

10. Check for Faulty Modules

11. Some vehicles have multiple modules that can affect the brake switch input. Check for any related fault codes in other modules (e.g., ABS, BCM) that may provide additional context

12. Inspect the Fuse

13. Locate and inspect the fuse associated with the brake light circuit. Replace any blown fuses and check if the code returns

14. Scan for Additional Codes

15. Use an OBD-II scanner to check for any additional trouble codes that may be related to the brake system or other components

16. Clear the Code and Test Drive

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

18. Consult the Vehicle Manual

19. Refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures related to the brake switch and associated circuits

20. Seek Professional Help

21. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair. By following these steps, you should be able to identify and resolve the issue related to the P0572 code