Engine Electrical
DTC P0563
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0563
- System Voltage High -ECM 12V
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine control module (ECM) monitors the 12V 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.
Conditions for Running the DTC
* The vehicle speed is greater than 8 km/h (5 mph).
* The 12V system voltage is between 9.5-18 V.
Conditions for Setting the DTC
The ECM detects a 12V system voltage above 16 V.
Action Taken When the DTC Sets
* The ECM will command the charge indicator to be illuminated on the instrument panel cluster (IPC).
* 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
* This DTC could be set by overcharging with a battery charger.
* A high voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
* Engine Controls Schematics (Electrical Diagrams)
* Starting and Charging Schematics (Electrical Diagrams)
* Power Distribution Schematics ([1][2]Electrical Diagrams)
* Ground Distribution Schematics ()
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Charging System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
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 12V battery terminals. The voltage should be between 12.6 and 15.0 V.
• 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 12.6 and 15.0 V.
• If greater than the specified range, 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.