OBD Code P0561

System Voltage Unstable

What’s mean?

OBD2 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 history, freeze frame data, fuel trim values and other data. If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.

Symptoms

Possible sumptoms of P0561
– Engine Light ON (or Service Engine Soon Warning Light) – Slow engine start – Low battery power

Possible Causes

Possible causes of P0561
– Loose or missing alternator drive belt – Faulty alternator – Battery defective – Open or short system voltage circuit The Error code is generally activated on detection of the following conditions: The P0561 code is detected when there is an open in ECM back-up power source circuit

Possible Solutions