P0563
Powertrain Codes
P0563 - FORD - System Voltage High
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Slow engine start - Low battery power
Possible Causes
- Loose or missing alternator drive belt - Faulty alternator - Battery defective - Open or short system voltage circuit
When Detected
The P0563 code is detected when the battery voltage detected by the ECM is more than a calibrated value
Tech Notes
Higher than expected voltage problems are most likely caused by bad voltage regulator. The voltage regulator is part of the alternator.
Description
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the ECM to store data such as DTC history, freeze frame data, fuel trim values and other data. If the battery voltage falls below a minimum level, the ECM will conclude that there is a fault in the power supply circuit. The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.