P0563 System Voltage High

Powertrain Severity: Moderate Generic OBD-II

The engine computer sees high supply voltage.

Common causes

  • Faulty alternator regulator
  • Poor voltage sense connection

Symptoms

  • Battery light
  • Bulbs failing
  • Possible electronics damage

What to check

  1. Measure charging voltage
  2. Check regulator
  3. Inspect sense wire

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0563, follow the service information for that make and model.

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