Cruise Control/Brake Switch A Circuit Malfunction
The P0571 code indicates a malfunction in the cruise control brake switch A circuit. This switch is typically located on the brake pedal and sends a signal to the powertrain control module (PCM) when the brake is applied to disengage cruise control. A faulty switch, wiring issues, or a blown fuse can cause this code. The PCM detects an incorrect voltage or signal from the switch, preventing cruise control from operating properly.
01. Most Common Causes
- Faulty brake switch
- Wiring or connector issues in the brake switch circuit
- Blown fuse related to brake switch or cruise control
- Misadjusted brake switch
02. Symptoms You Will Notice
- Cruise control inoperative
- Brake lights may not work
- Check Engine Light illuminated
- Cruise control light flashing or not engaging
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for other related codes.
Step 2: Inspect the brake switch for proper operation and adjustment; test with a multimeter.
Step 3: Check the brake switch fuse and wiring for damage or corrosion.
Step 4: Replace the brake switch if faulty and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but cruise control will not work. If the brake lights are also affected, it may reduce safety. Have it repaired soon.
How much does it cost to fix?▼
Typically $50 to $150 for parts and labor, depending on the vehicle and shop rates.