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 - 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 engine is running.

Conditions for Setting the DTC

The ECM detects that the system voltage is greater than 18 V for 5 seconds.

Action Taken When the DTC Sets

DTC P0563 is a type C DTC.

Conditions for Clearing the DTC

DTC P0563 is a type C 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.

Reference Information
Schematic Reference

* Engine Controls Schematics ([1][2]Electrical Diagrams) for the 3.7L (LLR) engine
* Engine Controls Schematics ([1][2]Electrical Diagrams) for the 5.3L (LH8) engine

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 (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 battery terminals. The voltage should be between 12.6 and 15.0 V.

• If not within the specified range, refer to Charging System Test (Component Tests and General Diagnostics).

2. 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.