What does code P0562 mean?

P0562 means system voltage stayed below normal (roughly under 10–11V running) long enough to log. It’s moderately serious — you can usually keep driving gently, but diagnose it soon.

Will this code strand me?

It's the warning before the stranding: charging problems end with a dead battery at an inconvenient time, and overvoltage ends with cooked electronics. Diagnose within days, not months.

Why do I also have communication (U) codes?

Low or unstable voltage makes modules brown-out and drop off the network — the classic U-code storm. Fix the voltage, clear everything, and see what (usually nothing) returns.

P0562 — System Voltage Low

Moderate

Quick answer

P0562 means system voltage stayed below normal (roughly under 10–11V running) long enough to log. First move: measure charging voltage at the battery with the engine running: 13.5–14.8V is healthy; no rise means the alternator side; low resting voltage means the battery side.

What it means

P0562 reports that system voltage stayed below normal (roughly under 10–11V running) long enough to log.

Every module in the vehicle runs on system voltage, and the engine computer monitors it constantly. Voltage codes are rarely about the computer — they're about the battery, alternator, and the connections between them.

Like every code on this site, the diagnosis below runs cheapest-first — the order exists because the cheap causes really are the common ones.

P0562 symptoms: what you'll notice

Battery warning light on, often with headlights that dim at idle and brighten when you rev
Slow cranking, or a dead battery in the morning after the car sat overnight
Accessories shutting themselves off — radio, heated seats, blower — as the car sheds electrical load
Multiple unrelated warning lights as modules brown out
If the alternator has quit, the car is running on the battery alone and can die while you’re driving — treat this one with urgency

Common causes

Ordered from most to least likely.

1.

See the diagnosis steps

This family shares its suspect list; the steps below walk it in order of cost and likelihood.
2.

Wiring or connector damage

The universal suspect for any circuit-flavored code.
3.

The component named by the code

Condemned by measurement, never by guess.

How to fix it: diagnosis, step by step

Cheapest and most likely checks first.

1 Test the battery and charging system

The 20-minute multimeter test (see our battery & alternator guide): ~12.6V resting, 13.5–14.8V running, holding above ~13.2V with accessories loaded. The numbers point directly at battery, alternator, or neither.
2 Clean and tighten the grounds

Battery terminals, battery-to-body, body-to-engine. Corroded grounds produce every electrical symptom in the book, including this family and a chorus of communication codes.
3 Check the alternator output under load

Headlights + blower + defroster at idle: voltage collapsing toward 12V means the alternator can't keep up; over 15.5V sustained means the regulator failed high.
4 Look for the intermittent

If the code is occasional, wiggle-test the main charging cables and watch the meter — a chafed cable or loose alternator connection shows itself with movement.

Parts & tools you may need

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Frequently asked questions

What does code P0562 mean?: P0562 means system voltage stayed below normal (roughly under 10–11V running) long enough to log. It’s moderately serious — you can usually keep driving gently, but diagnose it soon.
What does P0562 mean in plain words?: System voltage stayed below normal (roughly under 10–11V running) long enough to log. Measure charging voltage at the battery with the engine running: 13.5–14.8V is healthy; no rise means the alternator side; low resting voltage means the battery side.
Will this code strand me?: It's the warning before the stranding: charging problems end with a dead battery at an inconvenient time, and overvoltage ends with cooked electronics. Diagnose within days, not months.
Why do I also have communication (U) codes?: Low or unstable voltage makes modules brown-out and drop off the network — the classic U-code storm. Fix the voltage, clear everything, and see what (usually nothing) returns.