P0562: System Voltage Low
TL;DR
P0562 = system voltage low. Severity: medium. Top causes: failing alternator (40%), weak battery (25%), corroded/loose connections (20%), belt/wiring (15%). Risk of stalling/no-start — diagnose soon.
Can I keep driving with P0562?
IF voltage is only slightly low and the car runs → drive directly to get it tested; don’t add a long trip. IF the battery light is on, lights are dimming or it’s struggling → it may stall and not restart; fix it before driving far.
Symptoms
- Check engine light on
- Battery/charging warning light
- Dim or flickering lights
- Electrical accessories acting up
- Possible stalling or no-start
Top causes (ranked by probability)
| Likely cause | Probability | Notes |
|---|---|---|
| Failing alternator / voltage regulator | 40% | |
| Weak or failing battery | 25% | |
| Corroded or loose battery/ground connections | 20% | Cheap to check first |
| Slipping/worn drive belt or wiring fault | 15% |
What does P0562 mean?
Technical explanation
The ECM monitors battery/charging-system voltage. P0562 sets when voltage stays below a threshold (typically under ~10–11 V) while running. The most common cause is a failing alternator (worn brushes, bad diodes, faulty voltage regulator) not maintaining charge, followed by a weak battery, high-resistance connections (corroded terminals, poor grounds), or a slipping/worn drive belt. Severe undervoltage can cause erratic module behavior, warning lights and stalling.
In simple terms
Your car’s electrical system should sit around 13.5–14.5 volts while running. P0562 means it’s too low — usually the alternator isn’t charging, the battery is weak, or a connection is corroded. You may see dim lights and a battery warning, and the car could eventually stall or fail to restart.
How to diagnose P0562 (step by step)
- Measure battery voltage running and off. Off ~12.6 V; running should be ~13.5–14.5 V. Low while running points to charging.
- Inspect battery terminals and grounds. Corroded or loose connections cause voltage drop — clean/tighten.
- Test the alternator output. Confirm it’s charging under load; check for bad diodes.
- Check the battery. Load-test the battery; a weak one drags voltage down.
- Inspect the drive belt. A slipping or worn belt reduces alternator output.
Repair options & cost
- Replace the alternator
- Replace the battery
- Clean/repair connections and grounds
- Replace the drive belt
🔧 Doing it yourself? Buy the part: Car battery
| DIY cost | $20–$400 |
|---|---|
| Workshop cost | $150–$800 |
| Repair time | 30 minutes (connections) to 2 hours (alternator) |
Costs are local ballpark ranges and vary by region and vehicle.
Tools you’ll need
Scan your car: recommended OBD-II scanners →Vehicle-specific notes
- Check battery terminals and grounds first — a corroded connection mimics a charging fault and is cheap to fix.
- A failing alternator is the most common cause; have it bench- or on-vehicle tested.
- P0562 (low) is the opposite of P0563 (high voltage).
Common mistakes to avoid
- Replacing the battery when the alternator isn’t charging
- Ignoring corroded terminals and poor grounds
- Overlooking a slipping drive belt
- Driving far with a known charging fault (risk of stall)
Frequently asked questions
What causes P0562?
Most often a failing alternator not maintaining charge, a weak battery, corroded/loose connections, or a slipping drive belt.
Is it safe to drive with P0562?
Only briefly. Low charging voltage can lead to a stall and no-restart. Get the charging system and battery tested promptly.
How do I tell if it’s the alternator or battery?
Measure voltage with the engine running: ~13.5–14.5 V means charging is OK (suspect the battery/connections); under that points to the alternator or its connections.
P0562 summary
| Meaning | System (charging) voltage too low |
|---|---|
| Severity | Medium |
| Safe to drive? | Caution — may stall |
| Top cause | Failing alternator (40%) |
| DIY cost | $20–$400 |
| Shop cost | $150–$800 |