P0562 — System voltage low

What this code generally means, its most common causes, and how serious it is.

TYPE: GENERICSYSTEM: ELECTRICAL AND CONTROL MODULE

What does the code P0562 mean?

The control module monitors the voltage that powers it. This code appears when that voltage stays below the expected threshold, which can affect other electrical systems in the vehicle.

Common possible causes

A weak or worn-out battery — the most common cause.
A failing alternator or charging system — no longer recharges the battery enough while driving.
Corroded or loose battery terminals — poor electrical contact.
Excessive electrical load — many accessories running at once, rarely the sole cause.

General severity

Moderate to serious — worth a prompt check

Persistently low voltage can trigger other codes or odd electrical behavior, and if it keeps dropping, a stalling or no-start risk. Worth checking fairly soon, especially the battery and alternator.

This is still a general severity for this code, not a diagnostic for your car. Only a real read of your codes, with your mileage and vehicle history, can tell what's really going on.

Get a diagnostic for YOUR car

Connect a Bluetooth OBD2 reader and read your vehicle's real codes with Meca — free, no appointment, with causes ranked for your actual situation.

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Meca doesn't replace an in-person check by a professional. For any serious sign (a flashing light, a major loss of power, a fuel smell), see a mechanic promptly.

Frequently asked questions

Is this just a weak battery?

That's the most common cause, but an alternator that's no longer charging enough can give the same code even with a healthy battery.

Can I test this myself?

A basic battery and charging test is possible with a simple multimeter, but a full charging-system test often needs a pro's equipment to be reliable.

Is my car more likely to not restart?

Yes, that's a real risk if voltage keeps dropping — better not to wait too long before checking.