Engine Electrical

DTC P0563

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0563
- System Voltage High - ECM

Diagnostic Fault Information






Circuit/System Description

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components, and incorrect data may occur if the voltage is out of range. If the ECM detects that the system voltage is too high, then DTC P0563 sets.

Conditions for Running the DTC

* The vehicle speed is above 8 km/h (5 mph).
* The system voltage is between 9.5-18 volts.

Conditions for Setting the DTC

The ECM detects a system voltage above 16 volts for less than 1 second.

Action Taken When the DTC Sets

DTC P0563 is a C type DTC.

Conditions for Clearing the DTC

DTC P0563 is a C type DTC.

Diagnostic Aids

* DTC P0563 could be set by overcharging with a battery charger or jump starting.
* A high voltage value in multiple modules indicates a concern in the charging system.

Circuit/System Verification

1. Measure and record the voltage at the battery terminals with the engine OFF, and again with the engine running. Verify that the battery voltage is 11-16 volts with the engine OFF and with the engine running.

• If the battery voltage is not within the specified range, refer to Charging System Test (Acadia or Enclave) Charging System Test (OUTLOOK). Charging System Test Charging System Test

2. Observe the scan tool Ignition 1 Signal parameter in the ECM data list. Verify that the scan tool displays a value that is within 2 volts of the battery voltage recorded in step 1.

• If the scan tool parameter is not within the specified range, replace the ECM.

3. Refer to Diagnostic Aids.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests