P0563 - SYSTEM VOLTAGE HIGH

The PCM (Powertrain Control Module) controls the vehicle’s charging system through a power or ground circuit to the voltage regulator inside the alternator. This control of the ignition power circuit is useful in determining if the charging system is working.

If the charging system is detected to have excessively high voltage, the P0563 OBDII fault code P0563 will be set.

• Check Engine light ON.
• Battery trouble light ON.
• The engine does not start or stop unexpectedly.
• Reduced fuel efficiency.
• It is not possible to shift the transmission.

The P0563 OBD2 diagnostic code is set due to one or more of the following reasons:

• The cable connecting the alternator to the battery may have excessively high resistance.
• The circuit between the alternator and the control module could have a low resistance due to a faulty cable.
• The alternator may be in bad condition.

To troubleshoot DTC P0563 OBDII, take into account the following steps:

• As a first step, consult the Technical Service Bulletins.
• Start the engine and activate the headlights and fans to perform a system charge. After this, use a voltmeter to check the battery voltage. It should be between 13.2 and 14.7. If it is higher than this range, continue diagnosing the charging system.
• Locate your vehicle's PCM and visually inspect the circuit connectors and wiring. Look for damage such as wear, corrosion, or burn points. Repair or replace as needed.
• Check the PCM ignition power wiring for damage with a Voltage less than battery voltage indicates wiring problems. Perform the required corrective work.
• Verify that the circuit is properly grounded. Verify that the wires in the circuit are not damaged. If you determine that there is an intermittent or poor connection, make the necessary corrections.