Engine Electrical

DTC P0562

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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.

Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.

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 that DTC P0562 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 and ground circuits for an open/high resistance.

* Ignition 1 signal 4.3L X1 terminals 19 and 73.
* Ground circuit 4.3L X2 terminal 73.
* Ignition 1 signal V8 gas engines X1 terminals 19 and 47.
* Ground circuit V8 gas engines X1 terminal 73.
* Ignition 1 signal 6.6L X1 terminal 76 and X2 terminal 21.
* Ground circuits 6.6L X2 terminals 2-4 and 6.

Repair Instructions

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

Refer to Programming and Relearning. Programming and Relearning