P0562
System Voltage Low
high
i Description
The ECU has detected that the system voltage (battery/charging voltage) has dropped below the normal operating range (typically below 10V). Normal running voltage is 13.5-14.5V.
? Common Causes
- Failing alternator
- Weak or old battery
- Corroded battery terminals
- Loose or damaged serpentine belt
- Excessive electrical load
- Parasitic drain
! Symptoms
- Check engine light
- Dim headlights
- Slow engine cranking
- Battery warning light
- Electrical accessories acting erratically
- Multiple warning lights
# Diagnostic Steps
- Test battery voltage (should be 12.4-12.7V engine off)
- Test alternator output (should be 13.5-14.5V engine running)
- Inspect battery terminals for corrosion
- Check serpentine belt tension
- Test for parasitic drain
⚙ Typical Fix
Replace the alternator or battery. Clean battery terminals.
Parts Needed
Battery, Alternator, Serpentine belt
Estimated Cost
$100-$600
↔ Related Codes
Q Frequently Asked Questions
If the battery light is on, the alternator may not be charging. You can drive a short distance but the battery will eventually go flat and the car will stall. Go directly to a mechanic or auto electrician.
Battery replacement is straightforward DIY. Alternator replacement varies by vehicle — some are easy, others require significant disassembly.
Battery: $100-$250. Alternator: $200-$600 including labour.
☞ Learn More
- Check Engine Light — What it means, is it safe to drive & how to fix
- What is OBD-II? — Complete guide to your car's diagnostic system
- How to Read DTC Codes — Step-by-step with a Bluetooth scanner
- OBD-II Scanner Buying Guide — Find the best scanner for your car