P0A7E

DTC P0A7E

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 P0A7E
- Hybrid Battery Pack Overtemperature




Circuit/System Description

The engine control module (ECM) monitors the hybrid battery pack for an overtemperature condition.


Conditions for Running the DTC

The engine is running.


Conditions for Setting the DTC

Maximum module temperature is greater than 57°C (134.6°F) for 1.7 minutes.


Action Taken When the DTC Sets

Does not affect hybrid system operation.


Conditions for Clearing the DTC

Hybrid battery temperature returns to lower than or equal to 57°C (134.6°F).


Diagnostic Aids

* Possible battery pack cooling fan concern
* Foreign material blocking vents



Reference Information
Schematic Reference

Hybrid Energy Storage Schematics ()
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

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.


Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.


1. If DTC is history, refer to Diagnostic Aids or Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics).
2. If DTC is current, replace the battery energy control module (BECM).



Repair Instructions

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


Control Module References (Programming and Relearning) for BECM replacement, setup, and programming