Mercedes Benz

Diagnostic trouble code P0571 indicates that there is a malfunction in the cruise control/brake switch A circuit. The cruise control system is designed to maintain a constant vehicle speed without the need for the driver to manually control the throttle, while the brake switch is used to disengage the cruise control system when the driver applies the brakes. When the ECM detects that there is a malfunction in the cruise control/brake switch A circuit, it will set a diagnostic trouble code P0571 and turn on the Check Engine light. This may cause the cruise control system to become inoperative or to function incorrectly. The most common causes of this code include a faulty cruise control/brake switch A, a damaged wiring harness, or a failed ECM. To diagnose and repair this code, a mechanic will need to perform a thorough inspection of the cruise control/brake switch A circuit and related components to determine the exact cause of the malfunction. Once the issue is identifie...