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 - ECM
Diagnostic Fault Information
Circuit/System Description
The engine control module (ECM) monitors the battery positive (B+) 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. If the ECM detects low battery voltage, then DTC P0562 will set.
Conditions for Running the DTC
* The vehicle speed is greater than 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 less than 10 volts for 5 seconds.
Action Taken When the DTC Sets
* The ECM will command the charge indicator to be illuminated on the instrument panel cluster (IPC).
* The ECM will not illuminate the malfunction indicator lamp (MIL).
* The ECM will store conditions, which were present when the DTC set as Fail Records data only.
Conditions for Clearing the DTC
* The ECM will command the message OFF after one trip in which the diagnostic test has been run and passed.
* The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
* Control Module References (Programming and Relearning) for ECM schematics
* Starting and Charging Schematics ([1][2]Electrical Diagrams)
* Power Distribution Schematics (Power Distribution Diagrams)
* Ground Distribution Schematics (Ground Distribution Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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. Measure and record the voltage at the battery terminals with the engine OFF, and again with the engine running. Verify that the battery voltage is 11-16 volts with the engine OFF and with the engine running.
• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test) .
2. Observe the scan tool Ignition 1 Signal parameter in the ECM data list. Verify that the scan tool displays a value that is within 2 volts of the battery voltage recorded in step 1.
• If the scan tool parameter is not within the specified range, refer to Circuit/System Testing.
3. Refer to Diagnostic Aids.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the ECM. Verify that there is less than 1.0 ohm between the ground circuits and the negative battery terminal.
• If greater than the specified value, test the ground circuit for an open/high resistance.
2. Ignition ON, test for 11-14 volts between the battery positive voltage and the ground circuits of the ECM.
• If not within the specified range, test the battery positive voltage circuits for a short to ground or an open/high resistance.
3. If all circuits test normal, test or 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