Ford P0571 OBD-II Trouble Code Definition: P0571 Brake Light Switch Plausibility P0571 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0571 Brake Switch “A” Circuit What does the code mean? OBD-ii Code P0571 definition: When the brake pedal is depressed, the stop light switch sends a signal to the ECM. When the ECM receives this signal, it […]