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Powertrain fault code

P0563: System Voltage High

Fix soon

The car may not start next time, or electrical systems may misbehave. Have the charging system tested.

What P0563 means

The battery voltage the engine computer sees is too low or too high.

Common causes

  • Weak battery
  • Faulty alternator or regulator
  • Loose or corroded battery terminals or earth strap

What to check first

  1. Check battery terminals are tight and clean.
  2. Have the battery and alternator tested (many parts shops do this).

Get P0563 explained for your car: $2.99

  • P0563 explained in full for your make and model: meaning, how urgent, likely causes and what to check, in order.
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  • Your own private report page you can save as a PDF or show your mechanic.

Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0563?

Tell us your car and what it is doing with P0563. We reply by email with what to check first, in plain words. Free.

Related codes

P0562

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.