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P1AE6




DTC P0AA6, P1AE6, or P1F0E

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 Descriptors
DTC P0AA6
- Hybrid/EV Battery Voltage System Isolation Lost

DTC P1AE6
- Battery Energy Control Module Hybrid/EV Battery Voltage Isolation Sensor Circuit

DTC P1F0E
- Battery Charging Voltage System Isolation Lost

Circuit/System Description

The battery energy control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery energy control module to the vehicle control interface module through serial data. The vehicle control interface module is the host controller for diagnostic trouble code (DTC) information.

The vehicle is equipped with a high voltage isolation monitor feature. The purpose of the high voltage isolation circuit is to test the resistance between the high voltage positive and negative direct current (DC) bus and chassis ground. The battery energy control module only runs this test when the ignition transitions from ON to OFF and the high voltage contactor relays have opened. The battery energy control module has an internal isolation sensor that measures the resistance between the high voltage DC positive and negative bus and chassis ground. The battery energy control module runs an internal self check of this sensor circuit. The battery energy control module sends an AC signal over the DC bus and monitors its amplitude. A low amplitude or collapsed return signal indicates a loss of resistance to chassis ground and a loss of isolation will be indicated by the hybrid powertrain control module 2. Because this diagnostic runs after system power down, the diagnostic status does not get reported until the next key cycle.

Conditions for Running the DTC

P0AA6
* The main contactors transition to open for 10 seconds.
OR
* The main contactors transition to open for 10 seconds at the end of active cooling.

P1AE6
* The 12 V battery voltage is greater than 9 V.
* The hybrid powertrain control module 2 and battery energy control module are awake and communicating.
* The hybrid powertrain control module 2 has requested the battery energy control module to run the isolation test.
* The main contactors are open.
* DTC U185B is not set.

P1F0E

The vehicle is in Charge Mode.

Conditions for Setting the DTC

P0AA6
* The battery energy control module has detected less than 325K ohm.
OR
* The battery energy control module has detected less than 400K ohm after active cooling.

P1AE6

The battery energy control module has detected a loss of isolation

P1F0E
* During charge mode the battery energy control module has detected less than 325K ohm after 10 seconds.
OR
* During charge mode the battery energy control module has detected less than 400K ohm after 10 seconds, with DTC P1F0E set.

Action Taken When the DTC Sets

DTCs P0AA6, P1AE6 and P1F0E are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0AA6, P1AE6 and P1F0E are Type A DTCs.

Diagnostic Aids

* A single high voltage contactor stuck closed can set this DTC.
* An open charger fuse may cause a P1AE6 or P1F0E.
* Condensation or water intrusion into the hybrid/EV battery pack may cause P0AA6, P1AE6, or P1F0E to set.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics Hybrid Energy Storage Schematics
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation

Drive Motor Battery System Description Drive Motor Battery System Description
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

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

Control Module References Control Module References for scan tool information
Special Tools

EL-48900 - HEV Safety Kit



Circuit/System Verification

Observe the scan tool hybrid powertrain control module 2, Isolation Test Resistance parameter. The reading should display greater than 500k ohm.

Circuit/System Testing

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:


* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.

* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.


- Visually and functionally inspect the gloves before use.

- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.


Failure to follow the procedures exactly as written may result in serious injury or death.


Danger: The Volt Battery Pack will utilize an exchange program. Please consult the most recent revision of bulletin/PI #PIP4841, available in Service Information (SI), for a list of approved Volt Battery Pack service procedures. Components that may be removed and serviced without exchanging the complete battery pack are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.


1. Ignition OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
2. Connect the 12 V battery.
3. Ignition ON, verify that DTC P0A7E, P0AA1, P0AD9, P0ADD, P0AE2, P0AE4, P0C32, P0D0A, P0D11, P1EBC-P1EBF, P1EC0, or P1EC3-P1EC5, is not set.

• If any DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

4. Ignition OFF, disconnect the 12 V battery.

Note: The following continuity tests must be performed using an Insulation Multimeter. Select the Isolation test setting, then select the 500 V range.

5. With the Insulation Multimeter, set on the Isolation test setting, test for greater than 400k ohm between the A28 hybrid battery contactor assembly harness connector terminals listed below and chassis ground:

* Battery charger negative harness side terminal B X5
* Battery charger positive harness side terminal A X5

• If less than the specified range, disconnect the X4 connector at the T18 battery charger. Test for greater than 400k ohm between the circuit terminals and chassis ground. If the test result is greater than the specified value, replace the T18 battery charger. If the test result is less than the specified range, replace the 300 V DC cables and test or replace the charger fuse.

6. Remove the fuse cover and battery protector (Insulator). Refer to Battery Charger and 14 V Power Module Maxi 20 A Fuse Replacement Battery Charger and 14 V Power Module Maxi 20 A Fuse Replacement.
7. With the Insulation Multimeter, set on Ohm setting, test for less than 1 ohm across the battery charger fuse.

• If greater than the specified range, replace the battery charger fuse.

8. If all the circuit tests normal, replace the A4 hybrid/EV battery pack.

Repair Instructions

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

* Battery Charger and 14 V Power Module Maxi 20 A Fuse Replacement Battery Charger and 14 V Power Module Maxi 20 A Fuse Replacement
* 300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter ) 300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Inverter )300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module) 300-Volt Battery Positive and Negative Cable Replacement (Inverter-to-Compressor/Heater Module)300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module) 300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger) 300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-Charger)
* Drive Motor Battery Replacement and Shipping Preparation Procedures
* Control Module References Control Module References for battery energy control module replacement, programming and setup for the hybrid/EV battery pack replacement.

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