Engine Electrical

DTC P0562

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (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 P0562
- System Voltage Low




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 volts.



Conditions for Setting the DTC

The ECM detects a system voltage below 10 volts for 5 seconds.


Action Taken When the DTC Sets

DTC P0562 is a C type DTC.


Conditions for Clearing the DTC

DTC P0562 is a C type DTC.


Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

Engine running, observe the scan tool ECM Ignition 1 Signal parameter. The Ignition 1 Signal parameter should read 10.5 volts or greater.


Circuit/System Testing

1. Verify P0562 DTC is set as current.

• If the DTC is history, refer to Charging System Test (Charging System Test)

2. Engine running, measure the voltage at the battery terminals and compare it with the Ignition 1 Signal parameter. The battery and Ignition 1 signal readings do not differ more than 2 volts.

• If greater than the specified value, test the Ignition 1 circuit and ground circuit for an open/high resistance.


* Ignition 1 signal 3.6L engine X2 terminals 1- 3- 17- 58.
* Ground circuit 3.6L engine X1 terminal 49.
* Ignition 1 signal 5.3L engine X1 terminal 19 and X2 terminal 13
* Ground circuit 5.3L engine X2 terminal 73

3. If the 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.