Electrical and control module
P0563 — System Voltage High
The ECU measures a system voltage above the normal range. Overvoltage can damage the battery, lights and electronic modules.
Common causes
- Faulty alternator voltage regulator
- Loose or corroded battery or ground connection
- Faulty battery
- Wiring fault between alternator and battery
- Faulty battery sensor or charging control
Symptoms
- Very bright or burnt-out bulbs
- Battery warning light
- Battery overheating or smell
- Check engine light
How to check
- Measure voltage at the battery with the engine running (should be about 13.8-14.7 V)
- Check alternator output and the regulator
- Inspect battery terminals and ground connections
- Check the battery and charging control sensor
Can you keep driving?
Not recommended for long: overvoltage can harm the battery and electronics. Have the charging system checked soon.
Related codes
Frequently asked questions
- What does P0563 mean?
- The vehicle's electrical system voltage is above the normal range.
- What causes high system voltage?
- Most often the alternator's voltage regulator.
General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.