P0571: Cruise Control/Brake Switch A Circuit Malfunction
Can you still drive? Yes, but check your brake lights immediately. If brake lights are not working, other drivers cannot see you braking, which is a serious safety hazard.
What Does P0571 Mean?
Code P0571 indicates a malfunction in the brake switch circuit that is used by the cruise control system. The brake switch signals the PCM and cruise control module when the brake pedal is pressed. A faulty switch or circuit can prevent cruise control from engaging or disengaging properly.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty brake light switch
- Misadjusted brake light switch
- Damaged wiring to brake switch
- Blown brake light fuse
- Corroded brake switch connector
Symptoms
- Check engine light on
- Cruise control will not engage
- Cruise control does not disengage when braking
- Brake lights not working
- Shift interlock may not release
Diagnostic Steps
- 1Check if brake lights are functioning properly
- 2Inspect brake light switch adjustment at the brake pedal
- 3Test brake switch continuity with a multimeter
- 4Check brake light fuse
- 5Inspect wiring between brake switch and PCM for damage
- 6Verify switch operation with a scan tool while pressing the brake pedal
Recommended Parts & Tools
brake light switch
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $20 - $150 |
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Frequently Asked Questions
Can P0571 cause my brake lights to stop working?
Yes, the same brake switch that disengages cruise control often controls the brake lights. If the switch fails, both systems are affected.
Is the brake light switch easy to replace?
Yes, the brake light switch is located above the brake pedal and is typically a simple plug-and-play replacement that takes less than 30 minutes.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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