P0571 Fault Code

Cruise Control/Brake Switch A Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0571 fault code indicates a malfunction in the Cruise Control/Brake Switch A circuit. This system is crucial as it ensures that the cruise control system can only be activated when the brakes are not engaged. When there is an issue detected in this circuit, it can lead to improper functioning of the cruise control, which can be a safety hazard while driving.

What are the symptoms of the P0571 code?

Signs that you may have a P0571 fault code include:

• Cruise control not functioning: The system may not engage at all when attempting to use it.
• Inconsistent cruise control operation: The cruise control may disengage unexpectedly or may not respond to activation.
• Brake lights malfunctioning: You may notice the brake lights are not working correctly, indicating an issue with the brake light switch.
• Dashboard warning lights: The cruise control indicator light or other warning lights may illuminate on the dashboard.

What causes the P0571 code?

Several factors can cause the P0571 code to trigger, including:

• A faulty brake light switch: This switch must operate correctly to signal whether the brakes are applied.
• Poor electrical connections: Damaged wiring or corroded connectors in the cruise control or brake switch circuit may disrupt the signal.
• Issues with the cruise control module: A malfunctioning module can fail to interpret signals from the brake switch correctly.
• Blown fuses: Circuit interruptions due to blown fuses can lead to communication failures.

How to fix P0571?

To resolve the P0571 code, the following steps are recommended:

• Inspect the brake light switch: Check for functionality and ensure it is not stuck or damaged.
• Examine wiring and connectors: Look for any signs of fraying, corrosion, or loose connections, and repair or replace as necessary.
• Test the cruise control module: If the module is suspected, it may need to be tested or replaced.
• Check fuses: Ensure that all relevant fuses are intact and replace any that have blown.
• Perform a reset: After addressing any issues, clear the fault code and test the system to ensure proper operation.