Ford P0561 OBD-II Trouble Code Definition: P0561 Battery System Voltage P0561 Ford OBD-II Trouble CodeDescription: OBD Trouble Code P0561 System Voltage Unstable What does the code mean? OBD-ii Code P0561 definition: The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the ECM to store data such as DTC […]