Even if the ignition switch is off, the battery still supplies power to the ECM (Engine Control module). In this way, the Engine Control Module (ECM) can store data such as DTC (Diagnostic Trouble Code) history, freeze data, and fuel adjustment values.
If the battery voltage is below a minimum level, the ECM (Engine Control module) interprets this as the existence of a fault in the power circuit. When the engine starts, the service light comes on and the diagnostic code P0562 is obtained.