Engine Electrical ECM

DTC P0563 (ECM)

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 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.

Conditions for Running the DTC

* The vehicle speed is above 8 km/h (5 mph).

* The system voltage is between 9.5-18 V.

Conditions for Setting the DTC

The ECM detects a system voltage above 16 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 4.3L engine

* Engine Controls Schematics [1][2]Electrical Diagrams for V8 gas engines

* Engine Controls Schematics [1][2]Electrical Diagrams for the 6.6L engine

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

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 Control Module References for scan tool information

Circuit/System Verification

1. Verify DTC P0563 is set as current.

2. Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V.

• If the battery voltage is not within the specified range, refer to Charging System Test Testing and Inspection.

3. Engine running, observe the scan tool ECM Ignition 1 signal parameter.

4. Verify the battery and Ignition 1 signal readings do not differ more than 2.0 V.

• If greater than specified value, replace the ECM.

Repair Instructions

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

Control Module References Control Module References for ECM replacement, programming and setup