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
Diagnostic Fault Information
Circuit/System Description
The following control modules monitor the system voltage to ensure that the voltage stays within the proper range:
* Engine control module
* Fuel pump control module
* Transmission control module
Damage to components, and incorrect data may occur when the voltage is out of range.
Conditions for Running the DTC
Engine Control Module
* The vehicle speed is above 8 km/h (5 mph).
* The system voltage is between 9.5-18 V.
Fuel Pump Control Module
The ignition is ON.
Transmission Control Module
The system voltage is between 8.6-18.0 V.
Conditions for Setting the DTC
Engine Control Module
The engine control module detects a system voltage above 16 V for less than 1 second.
Fuel Pump Control Module or Transmission Control Module
The module detects the system voltage is greater than 18 V.
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
* A possible cause of this DTC could be overcharging with a battery charger or jump starting.
* A high voltage value in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
* Engine Controls Schematics ([1][2]Electrical Diagrams) for the LAF engine
* Engine Controls Schematics (LLT) ([1][2]Electrical Diagrams)Engine Controls Schematics (LF1) ([1][2]Electrical Diagrams) for the LF1 and LLT engine
* Automatic Transmission Controls Schematics (Diagrams) for the MH2 and MH4 transmission
* Automatic Transmission Controls Schematics (Diagrams) for the MH7 transmission
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 (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing For Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
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 C1 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. Engine running, observe the scan tool of the appropriate control module Ignition 1 signal parameter. Verify that the scan tool displays a value that is within 2 V of the battery terminal voltage.
• If not within the specified range, replace the appropriate control module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for the appropriate control module replacement, setup, and programming