P0562
System Voltage Low
Moderate· Fix soonDIY friendlyPowertrainGeneric, all makes
What it means
The ECU is seeing lower battery voltage than normal. The charging system may not be keeping up, or there is a poor connection.
Is it safe to drive?
You could be left stranded if the battery runs flat. Get the charging system checked soon.
Symptoms
- Battery warning light
- Dim lights
- Slow cranking
- Random electrical faults and other codes
Probable causes
Most likely first
- 1Weak or failing battery
- 2Failing alternator
- 3Loose or corroded battery terminals
- 4Slipping or worn drive belt
- 5Poor ground connection
How to diagnose it
Work through these in order before buying parts
- 1Measure battery voltage with the engine off (12.4–12.7 V is healthy).
- 2Measure voltage with the engine running (about 13.8–14.7 V is normal).
- 3Clean and tighten battery terminals and check main ground straps.
- 4Load-test the battery.
- 5Check for technical service bulletins (TSBs) or software updates for your make and model; some codes have known factory fixes.
Common fixes
- Clean and tighten battery terminals
- Replace the battery
- Replace the alternator
- Replace the drive belt
- Repair ground connections
This information is general guidance for all makes. Exact causes, specifications and procedures vary by vehicle, so confirm with your service manual or a qualified mechanic before replacing parts.