P0563 System voltage high
What P0563 means
The engine control unit has measured a supply voltage higher than it should be. Overcharging can damage the battery, bulbs and control units, so the cause should be found soon.
P0563 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 150–700 €
- Workshop time
- 0.5–3 h
- Repair difficulty
- Medium
- DIY possible
- Yes
- Check engine light
- Yes
- Affects emissions test
- No
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Bulbs very bright or blowing often
- Battery warning light on
- Battery hot or smelling of sulphur
- Check engine light on
Common causes
- Faulty alternator voltage regulator
- Poor battery sense or ground connection to the regulator
- Faulty battery sensor on cars with smart charging
- Jump-starting with a booster set to 24 volts
- Battery with an internal fault
Can I keep driving with P0563?
You can drive a short distance, but have it checked within a few days to a week. Prolonged overcharging can damage the battery and electronics.
What to check first
- Measure the battery voltage with the engine running; above about 15 volts is too high
- Check the alternator connections and ground
- Check the battery sensor on the negative terminal if fitted
- Replace the voltage regulator or alternator
Related codes
- P0562 System voltage low
- P0560 System voltage
- P0558 Brake booster pressure sensor circuit high
- P0571 Brake switch A circuit
- P0575 Cruise control input circuit
- P0533 A/C refrigerant pressure sensor A circuit high
- P0532 A/C refrigerant pressure sensor A circuit low
- P0530 A/C refrigerant pressure sensor A circuit
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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