Motor Vehicle Expert
OBD fault code guide

P0562 Code Meaning UK

P0562 means “System Voltage Low”. In plain English, the vehicle has detected that electrical voltage is too low for the control modules to work properly. This can be caused by a weak battery, failing alternator, loose auxiliary belt, poor battery terminals, bad earth strap, charging cable fault, blown fuse or voltage drop during starting.

📅 Updated June 2026 🇬🇧 UK diagnostic guide 🛠 Low voltage / charging fault
Quick answer Fault codes hub Battery warning guide
✓ P0562 meaning ✓ Battery checks ✓ Alternator testing ✓ MOT-aware advice
Quick answer Meaning Symptoms Causes Diagnosis Voltage checks Repair costs Can you drive? MOT impact Related guides FAQs
Quick answer

What does P0562 mean?

P0562 means the ECU or another control module has seen system voltage drop too low. Modern cars rely on stable voltage for engine management, ABS, steering assistance, airbags, lighting, gearbox control and communication between modules. When voltage drops, the car can store multiple fault codes that look unrelated.

Most likely area

Battery, alternator, auxiliary belt, battery terminals, earth strap, charging cable, fuse or parasitic drain.

Urgency

Moderate to high. More urgent if battery light, dim lights, heavy steering or non-start symptoms appear.

MOT risk

Can affect lighting, warning lights, ABS, steering assistance, emissions and engine running.

Code meaning

P0562 — System Voltage Low

The full description is usually P0562 System Voltage Low. It means the voltage supplied to the vehicle electronics has fallen below the expected range. This may happen while cranking, idling, driving, or when electrical load is high.

Low voltage can trigger false-looking faults in many systems. For example, ABS, airbag, gearbox, steering and engine codes may appear because those modules did not receive enough voltage to work correctly.

Mechanic view

Why low voltage causes strange faults

When voltage is low, control modules can behave unpredictably. You may see warning lights for systems that are not actually faulty. The real root cause may be a weak battery, poor earth or alternator that is not charging properly.

That is why P0562 should be diagnosed from the battery and charging system first before chasing every separate warning light.

Symptoms

Common symptoms of a P0562 code

P0562 can cause electrical and starting symptoms before the car fully breaks down.

Battery warning light

The battery or charging warning light may appear while driving.

Hard starting

The engine may crank slowly, click or struggle to start.

Dim or flickering lights

Headlights, dashboard lights or interior lights may dim or flicker.

Multiple warning lights

ABS, airbag, steering, gearbox or engine lights may appear together.

Heavy steering

Electric power steering may reduce assistance if voltage is too low.

Cutting out or non-start

Severe low voltage can make the car cut out or fail to restart.

Common causes

What causes a P0562 fault code?

P0562 is commonly caused by a battery, charging or electrical connection fault.

Very common

Weak battery

An old or weak battery can drop voltage during starting or under load.

Charging

Failing alternator

If the alternator is not charging correctly, voltage can drop while driving.

Belt issue

Loose or slipping auxiliary belt

A belt problem can stop the alternator being driven properly.

Connection

Poor battery terminals

Loose or corroded terminals can cause voltage drop and intermittent faults.

Earth fault

Bad earth strap

A poor engine or body earth can cause low voltage symptoms even with a good battery.

Charging cable

Damaged alternator cable

A bad charging cable, fuse link or connection can reduce charging voltage.

Fuse

Blown charging fuse or fusible link

Some charging systems use high-current fuses that can fail.

Drain

Parasitic battery drain

A drain while parked can leave the battery too low before starting.

Previous repair

Incorrect battery fitting

Wrong battery type, poor coding or loose fitment can create voltage issues on modern cars.

Diagnosis

How a garage should diagnose P0562

✅ Scan all modules and record voltage-related fault codes.

✅ Check battery resting voltage.

✅ Test battery condition with a proper battery tester.

✅ Check charging voltage at idle and under electrical load.

✅ Inspect battery terminals for looseness or corrosion.

✅ Check engine/body earth straps for voltage drop.

✅ Inspect alternator belt condition and tension.

✅ Check alternator output, charging cable and high-current fuses.

✅ Test for parasitic drain if the battery goes flat when parked.

Avoid this mistake

Do not chase every warning light first

Low voltage can make several modules complain at the same time. If P0562 is stored, the battery and charging system should be tested before replacing ABS sensors, steering parts, airbag parts or gearbox components.

Fixing voltage first often clears the “strange” secondary faults.

Charging system checks

Mechanic-style checks for P0562

A proper P0562 diagnosis should prove whether the battery is weak, the alternator is not charging, or voltage is being lost through bad connections.

Resting voltage

Check battery voltage before starting after the car has been parked.

Cranking voltage

Watch how far voltage drops while the starter motor is operating.

Charging voltage

Check alternator output with engine running and electrical loads switched on.

Voltage drop test

Test positive and earth sides of the circuit under load.

Belt inspection

Check for slipping, cracking, contamination or tensioner problems.

Parasitic drain

If the battery keeps going flat, check current draw when the vehicle is asleep.

UK repair cost guide

How much does P0562 cost to fix in the UK?

Costs vary depending on whether the fault is a battery, alternator, belt, wiring, earth strap or drain issue. These are rough UK guide prices only.

Battery and charging test

Usually around £40–£120 depending on testing depth and fault tracing.

Battery replacement

Cost depends on battery size, stop-start type, AGM/EFB requirement and coding.

Alternator replacement

Can cost more depending on access, part quality and belt/tensioner condition.

Auxiliary belt repair

Usually moderate, but tensioner or pulley faults can increase cost.

Earth strap or terminal repair

Often cheaper than major parts if voltage drop is caused by poor connections.

Parasitic drain diagnosis

Can take longer because the technician may need to test circuits while the car is asleep.

Safe driving advice

Can you drive with a P0562 code?

If the car starts and drives normally with no battery warning light, short careful driving may be possible. But if the battery light is on while driving, lights are dim, steering becomes heavy, warning lights appear together, or the car struggles to restart, get the charging system checked quickly. A car with a failing alternator can stop without much warning.

✅ Lower risk: stored code only, battery tests good, charging voltage normal and no warning lights.

⚠️ Medium risk: slow cranking, occasional warning lights, old battery or intermittent low voltage.

🚫 Higher risk: battery light while driving, dim lights, heavy steering, repeated non-start or cutting out.

Real experience

What I would check first

On a real P0562 job, I would start with battery condition and charging voltage. A weak battery can trigger low-voltage codes, but a failing alternator can leave you stranded while driving.

I would also check the earth strap carefully. A poor earth can mimic battery and alternator problems and create warning lights across several systems.

MOT implications

Will P0562 fail an MOT?

P0562 can lead to an MOT failure if low voltage affects lights, warning lights, ABS, airbag, steering assistance, engine running, emissions or other safety-related systems. Electrical faults should be fixed before testing if they affect road safety or required systems.

Lighting issues

Dim, flickering or failed lights can affect MOT outcome.

Safety warnings

ABS, airbag, steering or ESC warnings should be diagnosed before MOT.

Charging warning

A charging fault can cause multiple systems to fail during use.

Battery Warning Light Guide Alternator Not Charging Signs
Back to main hub

Browse more OBD fault code guides

P0562 is one common low system voltage and charging-related diagnostic trouble code. For more common codes, meanings, symptoms, repair costs and MOT implications, use the main Motor Vehicle Expert fault-code hub.

Back to OBD Fault Codes Hub Use Diagnostic App
Frequently asked questions

Frequently Asked Questions About P0562

Find answers to common questions about P0562 low voltage faults, battery problems, alternator issues, repair costs and MOT implications.

What does P0562 mean?

P0562 means the vehicle computer has detected low system voltage. The electrical system voltage has dropped below the level expected by the ECU or another control module.

Can I drive with a P0562 code?

You should be careful driving with P0562. If the battery light is on, lights are dim, steering becomes heavy, the car struggles to start, or multiple warning lights appear, stop and get the charging system checked.

Will P0562 fail an MOT?

P0562 can lead to an MOT failure if low voltage affects warning lights, lighting, steering assistance, ABS, airbag, engine running, emissions or other safety-related systems.

What causes a P0562 code?

Common causes include a weak battery, failing alternator, loose or slipping auxiliary belt, poor battery terminals, bad earth strap, charging cable fault, blown fuse, parasitic drain or low voltage during starting.

How much does P0562 cost to fix in the UK?

A battery and charging system test may cost around £40 to £120. Battery replacement, alternator replacement, belt repair, wiring repair or earth strap repair costs vary depending on the vehicle.

Can a bad battery cause P0562?

Yes. A weak battery, poor battery connection or voltage drop during starting can trigger P0562, but the alternator and charging system should also be tested.

About this guide

Based on practical mechanic-style diagnostic experience

Motor Vehicle Expert publishes practical UK vehicle guidance based on real-world mechanical knowledge and hands-on diagnostic experience. This P0562 guide is written to help drivers understand low voltage and charging system faults before replacing parts unnecessarily.

Fault codes should always be treated as a starting point for diagnosis. If your car has a battery warning light while driving, dim lights, heavy steering, repeated non-starts or cutting out, get the charging system checked before continuing to drive normally.