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P0562: System Voltage Low

Quick Answer

Not safe to drive

P0562 means the engine control unit has detected that the system voltage has dropped below the normal operating range, typically below 11.5 volts while the engine is running. This usually points to a failing alternator, a worn serpentine belt, corroded battery terminals, or an aging battery.

Severity
Moderate · Electrical
Estimated repair cost
From €15 to €800+, varies by vehicle

€15 or €800, depending on your car.

  • Clean and tighten battery terminals€15–€55
  • Replace alternator€200–€800

A scan shows whether P0562 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.

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A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy

What does P0562 mean?

P0562 is a electrical-related diagnostic trouble code classified as moderate severity.

What are the symptoms of P0562?

  • Check engine light on
  • Battery warning light illuminated on the dashboard
  • Dim headlights or interior lights
  • Electrical accessories malfunctioning or cutting out
  • Engine stalling or rough idle
  • Difficulty starting the engine

What causes P0562?

  • Failing alternator (worn brushes, faulty voltage regulator)

    : high

  • Worn or slipping serpentine belt

    : high

  • Corroded or loose battery terminals

    : medium

  • Aging or defective battery

    : medium

  • Excessive parasitic drain from aftermarket accessories

    : low

  • Faulty ground strap connection

    : low

Is it safe to drive with P0562?

No - address this immediately. Low system voltage can cause the engine to stall, disable safety systems like power steering and ABS, and leave you stranded. If the battery light is on, drive directly to a repair facility or pull over safely.

How do you diagnose P0562?

  1. With the engine running, measure the battery voltage with a multimeter across the battery terminals. Normal charging voltage is 13.5 to 14.8 volts. Below 13 volts indicates the alternator is not charging adequately
  2. Inspect the serpentine belt for cracks, glazing, or looseness. A slipping belt will not spin the alternator fast enough to maintain proper voltage. Check the belt tensioner for proper function
  3. Inspect the battery terminals for corrosion (white or green buildup). Clean them with a wire brush and baking soda solution, then tighten securely. Also check the ground strap connection to the chassis and engine block
  4. Have the battery load-tested. A battery that holds 12.6V at rest but drops below 9.6V under load is failing and should be replaced
  5. If the belt and battery are good but voltage is still low, test the alternator output directly. This can usually be done with the alternator still on the car. Check for worn brushes, a faulty voltage regulator, or bad diodes

How much does P0562 cost to fix?

Repair Parts Cost Labor Cost Total Estimate DIY Difficulty
Clean and tighten battery terminals €0–€15 €15–€40 €15–€55 Easy
Replace serpentine belt €15–€50 €30–€100 €45–€150 Easy
Replace battery €60–€200 €20–€60 €80–€260 Easy
Replace alternator €120–€500 €80–€300 €200–€800 Moderate

Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.

Full repair guides

P0562 on specific vehicles

Volkswagen

Volkswagen Golf

2003-2024

Test the overrunning alternator pulley and the drive belt before replacing the alternator.

BMW

BMW 3 Series

2005-2024

BMW has an intelligent battery sensor in the negative battery cable, and a replacement battery has to be registered with a scan tool. Check the registration and test the battery under load before condemning the alternator.

Source: mvwautomotive.com

Renault

Renault Clio

2005-2024

Check the drive belt condition and tension before replacing the alternator.

Skoda

Skoda Octavia

2005-2024

Check the main power cable and its crimp connections for heat or corrosion, and measure the voltage drop, before replacing the alternator.

Common questions about P0562

What causes P0562 system voltage low?
The most common cause is a failing alternator that can no longer maintain proper charging voltage. A worn serpentine belt, corroded battery terminals, or a weak battery are also frequent causes. The ECU sets P0562 when it detects voltage below approximately 11.5V.
Can a bad battery cause P0562?
Yes. A battery with a dead cell or severe internal degradation can drag system voltage down even while the alternator is working. If the battery is more than 4-5 years old and P0562 appears, have the battery load-tested as a first step.
Can I drive with P0562?
It is not advisable. Low system voltage can cause the engine to stall, disable electronic power steering, and shut down safety systems. If the battery light is on, the alternator may have failed and the vehicle is running on battery alone, which will die within minutes to hours.
How do I check if my alternator is working?
With the engine running, measure voltage at the battery terminals with a multimeter. It should read 13.5 to 14.8V. Then turn on headlights, A/C, and rear defroster. If voltage drops below 13V under load, the alternator is weak or failing.
Can corroded battery terminals cause P0562?
Yes. Heavy corrosion on the battery terminals creates resistance that prevents full current flow. The voltage at the ECU drops even if the alternator output is fine. Cleaning the terminals with a wire brush and applying dielectric grease is a quick, inexpensive fix.

Read our detailed guides

Sources

  1. mvwautomotive.com mvwautomotive.com/intelligent-battery-sensor/

Before you pay up to €800, check P0562 on your own car

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