Trouble codes › P0563
P0563 System Voltage High
Electrical and modules
P0563 means the electrical system voltage is too high, usually an alternator that's overcharging.
The engine computer saw the electrical system voltage above its normal range. Usually the alternator is overcharging.
Overcharging can damage the battery and electronics. Get it tested soon; stop if you smell a rotten-egg or burning smell from the battery.
Common causes
- A failed voltage regulator (usually inside the alternator)
- A poor connection to the alternator's voltage sense wire
- A bad ground
Symptoms
- Very bright or flickering lights
- Battery warning light
- Bulbs burning out, a hot or swollen battery
What to check first
- Measure voltage at the battery with the engine running; consistently above about 15 V is overcharging.
- Check the alternator's wiring and grounds.
- Have the alternator tested; replace it if the regulator has failed.
What does P0563 mean on your vehicle?
The likely cause depends on your engine. iRepair researches your exact year, make, model and engine (service bulletins, recalls and owner reports) and tells you what to check first. Your first 3 questions are free.
Ask iRepair about P0563No scanner? Most auto parts stores read check-engine codes for free.
Related codes
General guidance for P0563 on most vehicles. Some makers use the same code a little differently; confirm in the service information for your vehicle, put safety first, and see a professional when in doubt.