P0563

DTC P0563
Battery voltage read by ECM too high to be possible (Driving Cycle A)

Possible causes by suggested order of priority:
- Connector C1017.
- ECM battery voltage measurement.

Connector C1017.
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

ECM battery voltage measurement.
- GEMS ECM indicates battery volts high measurement fault.
- GEMS has measured an impossibly high battery voltage indicating a faulty ECM or that the vehicle has been started using a high voltage supply.