P0562 on a Mercedes-Benz: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can usually drive a Mercedes for a short time, but a weak battery can cause a string of electrical warnings, so get the charging system checked soon.

What P0562 means on a Mercedes-Benz

On a Mercedes-Benz, P0562 means the engine computer sees system voltage below about 10 volts. Mercedes cars carry a lot of electrical load, and the battery management system flags low voltage when the battery weakens or the alternator undercharges.

Is P0562 common on Mercedes-Benzs?

P0562 appears on C-Class, E-Class, and GLK models with aging batteries or failing alternators. Mercedes batteries tend to wear out after about four to six years, some models have both a main and an auxiliary battery, and a weak battery can cause a string of electrical warnings beyond just this code.

Commonly reported on: C-Class, E-Class, GLK, GLC.

Symptoms

Check engine light on
Slow cranking or hard starting
Battery warning light on the dash
Multiple electrical warnings at once

Common causes

most common: Weak or old battery
common: Failing alternator
common: Corroded or loose battery terminals
less common: Failing auxiliary battery on models that have one

How to fix it

Fix	DIY?	Typical cost
Test the battery and replace it if weak	Yes	$200–450
Clean and tighten the battery terminals	Yes	$0–20
Replace the alternator	Mechanic	$600–1300

Frequently asked questions

Can I drive my Mercedes with a P0562 code?

Yes, for a short time, as long as it starts. A weak battery can trigger many electrical warnings at once and can leave you stranded, so have it checked soon.

Is a weak battery the usual cause of P0562 on Mercedes-Benz models?

Yes. Mercedes batteries typically last about four to six years, and a weak battery is the most common cause of low-voltage codes. A failing alternator is the next most common.

How much does it cost to fix P0562 on a Mercedes-Benz?

A replacement battery runs about $200–$450. If the alternator has failed, replacement runs about $600–$1,300.