P0563 — System voltage high

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

TYPE: GENERICSYSTEM: ELECTRICAL AND CONTROL MODULE

What does the code P0563 mean?

The opposite of P0562: the control module detects a system voltage higher than expected, usually a sign the alternator is overcharging rather than undercharging.

Common possible causes

A failing voltage regulator — often built into the alternator — the most common cause.
Faulty wiring or grounding — can skew the voltage reading.
A failing battery — less common, but a worn-out battery can throw off the system's balance.

General severity

Moderate — worth a prompt check

Continuous overcharging can prematurely damage the battery and, over time, stress the vehicle's electronics. It usually isn't an immediate driving risk, but is worth checking fairly soon.

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

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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

Can this damage my battery?

Yes, sustained overcharging is a known cause of premature battery damage and sometimes damage to other electronics.

Can I keep driving with this code?

Short-term, usually yes, but it's better to get it checked fairly soon to avoid damaging the battery or other components.

Is this related to the alternator?

Often yes — a failing voltage regulator, the most common cause, is usually built right into the alternator.