Engine Electrical

DTC P0563

Diagnostic Instructions

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

DTC Descriptor
DTC P0563
- System Voltage High - ECM

Diagnostic Fault Information






Typical Scan Tool Data






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 when the voltage is out of range. If the ECM detects that the system voltage is high, DTC P0563 sets.

Conditions for Running the DTC

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

Conditions for Setting the DTC

The ECM detects that the system voltage is greater than 16 volts for 1 second.

Action Taken When the DTC Sets

* The charge indicator turns ON.
* The ECM will not illuminate the malfunction indicator lamp (MIL).
* The ECM will store conditions, which were present when the DTC set as Fail Records data only.

Conditions for Clearing the DTC

* The ECM will command the indicator OFF after one trip in which the diagnostic test has been run and passed.
* A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

Diagnostic Aids

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

Reference Information
Schematic Reference

Starting and Charging Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Charging System Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

• If not within the specified range, refer to Charging System Test Charging System Test.

2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between 12.60 and 15.00 volts.

• If all circuits test normal, replace the ECM.

Repair Instructions

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

Control Module References Programming and Relearning for ECM replacement, setup, and programming.