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Home >> Chevrolet >> 2012 >> Volt L4-1.4L Elect >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1F0E

P1F0E




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 vehicle is equipped with a high voltage isolation monitor feature. The purpose of the battery energy control module high voltage isolation monitor 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 isolation monitoring system measures the resistance between the high voltage system and chassis ground in the following way. The battery energy control module places an AC signal on the high voltage system and monitors its amplitude. A reduced amplitude return signal indicates a loss of resistance to chassis ground. This isolation monitor method is sometimes referred to as the active isolation monitor. The hpcm2 requests the BECM to perform this test. Measurement values are reported to the hpcm2 , which makes the determination of an isolation fault.

The isolation check for P0AA6 Hybrid Battery Voltage System Isolation Lost runs when all the contactors (main positive, main negative contactor, multi-purpose contactor, charger positive contactor and charger negative contactor) are open. This check monitors isolation in the drive motor battery system. This check runs only once during the time that the hpcm2 is awake and runs after the contactors have been open for 10 seconds. This monitor typically runs when the vehicle is turned off after a drive. It could also run when the vehicle is first started, if there is a long enough period between the hpcm2 waking up and the main contactors closing.

The isolation check for P1F0E Battery Charging Voltage System Isolation Lost runs when the main contactors and the multi-purpose contactor are open and the charger contactors are closed. This check monitors for isolation in the charger system along with the drive motor battery system. This check runs once during the time that the hpcm2 is awake and requires that the contactors main and mult-purpose contactors be open and the charger contactors be closed for 10 seconds.

The battery energy control module runs an internal self check of this sensor circuit. When this test fails, DTC P1AE6 will be set.

Conditions for Running the DTC

P0AA6
* The hybrid powertrain control module 2 and battery energy control module are awake and communicating
* All the contactors (main positive, main negative contactor, multi-purpose contactor, charger positive contactor and charger negative contactor) transition to open for 10 seconds.

P1AE6
* The 12 V battery voltage is greater than 11 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 hybrid powertrain control module 2 and battery energy control module are awake and communicating
* The vehicle is in Charge Mode Only for 10 seconds. Heating or cooling modes are not active.

Conditions for Setting the DTC

P0AA6
* The battery energy control module has detected active isolation resistance is less than 325K ohm.
* 5 Vehicle ON and Vehicle OFF cycles have occured.

P1AE6

The battery energy control module has detected no return AC signal, thus indicating a fault with the active isolation sensing circuits.

P1F0E
* During charge mode the battery energy control module has detected active isolation resistance of less than 325K ohm after 10 seconds.
* 5 Vehicle ON and Vehicle OFF cycles have occured.

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.
* P0AA6 and P1F0E require one Vehicle ON and Vehicle OFF cycle
* P0AA6 and P1F0E requires minimum resistance of 400K ohm.

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.
* Low or no coolant in the hybrid/EV battery cooling system 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
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 Programming and Relearning for scan tool information
Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools Tools and Equipment.

Circuit/System Verification

1. Verify that the vehicle hybrid/EV battery cooling system is full.

• If the hybrid/EV battery cooling system is low, refer to Hybrid/EV Battery Cooling Diagnostic Hybrid/EV Battery Cooling Diagnostic.

2. 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 15 meters (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 with leather protectors 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. Vehicle 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. Vehicle in Service Mode, 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. Vehicle 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-Charger) 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-APM Module) 300-Volt Battery Positive and Negative Cable Replacement (Drive Motor Battery-to-APM Module)
* Drive Motor Battery Replacement and Shipping Preparation Procedures
* Control Module References Programming and Relearning for battery energy control module replacement, programming and setup for the hybrid/EV battery pack replacement.

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