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P0C95




DTC P0A9C-P0A9E, P0AC6-P0ACD, P0AE9-P0AEB, P0BC3-P0BC5, P0C34-P0C36, P0C7D-P0C9A, or P0CA9-P0CBA

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 P0A9C
- Hybrid/EV Battery Temperature Sensor 1 Performance

DTC P0A9D
- Hybrid/EV Battery Temperature Sensor 1 Circuit Low Voltage

DTC P0A9E
- Hybrid/EV Battery Temperature Sensor 1 Circuit High Voltage

DTC P0AC6
- Hybrid/EV Battery Temperature Sensor 2 Performance

DTC P0AC7
- Hybrid/EV Battery Temperature Sensor 2 Circuit Low Voltage

DTC P0AC8
- Hybrid/EV Battery Temperature Sensor 2 Circuit High Voltage

DTC P0ACB
- Hybrid/EV Battery Temperature Sensor 3 Performance

DTC P0ACC
- Hybrid/EV Battery Temperature Sensor 3 Circuit Low Voltage

DTC P0ACD
- Hybrid/EV Battery Temperature Sensor 3 Circuit High Voltage

DTC P0AE9
- Hybrid/EV Battery Temperature Sensor 4 Performance

DTC P0AEA
- Hybrid/EV Battery Temperature Sensor 4 Circuit Low Voltage

DTC P0AEB
- Hybrid/EV Battery Temperature Sensor 4 Circuit High Voltage

DTC P0BC3
- Hybrid/EV Battery Temperature Sensor 5 Performance

DTC P0BC4
- Hybrid/EV Battery Temperature Sensor 5 Circuit Low Voltage

DTC P0BC5
- Hybrid/EV Battery Temperature Sensor 5 Circuit High Voltage

DTC P0C34
- Hybrid/EV Battery Temperature Sensor 6 Performance

DTC P0C35
- Hybrid/EV Battery Temperature Sensor 6 Circuit Low Voltage

DTC P0C36
- Hybrid/EV Battery Temperature Sensor 6 Circuit High Voltage

DTC P0C7D
- Hybrid/EV Battery Temperature Sensor 7 Performance

DTC P0C7E
- Hybrid/EV Battery Temperature Sensor 7 Circuit Low Voltage

DTC P0C7F
- Hybrid/EV Battery Temperature Sensor 7 Circuit High Voltage

DTC P0C82
- Hybrid/EV Battery Temperature Sensor 8 Performance

DTC P0C83
- Hybrid/EV Battery Temperature Sensor 8 Circuit Low Voltage

DTC P0C84
- Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

DTC P0C89
- Hybrid/EV Battery Temperature Sensor 9 Performance

DTC P0C8A
- Hybrid/EV Battery Temperature Sensor 9 Circuit Low Voltage

DTC P0C8B
- Hybrid/EV Battery Temperature Sensor 9 Circuit High Voltage

DTC P0C8E
- Hybrid/EV Battery Temperature Sensor 10 Performance

DTC P0C8F
- Hybrid/EV Battery Temperature Sensor 10 Circuit Low Voltage

DTC P0C90
- Hybrid/EV Battery Temperature Sensor 10 Circuit High Voltage

DTC P0C93
- Hybrid/EV Battery Temperature Sensor 11 Performance

DTC P0C94
- Hybrid/EV Battery Temperature Sensor 11 Circuit Low Voltage

DTC P0C95
- Hybrid/EV Battery Temperature Sensor 11 Circuit High Voltage

DTC P0C98
- Hybrid/EV Battery Temperature Sensor 12 Performance

DTC P0C99
- Hybrid/EV Battery Temperature Sensor 12 Circuit Low Voltage

DTC P0C9A
- Hybrid/EV Battery Temperature Sensor 12 Circuit High Voltage

DTC P0CA9
- Hybrid/EV Battery Temperature Sensor 13 Performance

DTC P0CAA
- Hybrid/EV Battery Temperature Sensor 13 Circuit Low Voltage

DTC P0CAB
- Hybrid/EV Battery Temperature Sensor 13 Circuit High Voltage

DTC P0CAE
- Hybrid/EV Battery Temperature Sensor 14 Performance

DTC P0CAF
- Hybrid/EV Battery Temperature Sensor 14 Circuit Low Voltage

DTC P0CB0
- Hybrid/EV Battery Temperature Sensor 14 Circuit High Voltage

DTC P0CB3
- Hybrid/EV Battery Temperature Sensor 15 Performance

DTC P0CB4
- Hybrid/EV Battery Temperature Sensor 15 Circuit Low Voltage

DTC P0CB5
- Hybrid/EV Battery Temperature Sensor 15 Circuit High Voltage

DTC P0CB8
- Hybrid/EV Battery Temperature Sensor 16 Performance

DTC P0CB9
- Hybrid/EV Battery Temperature Sensor 16 Circuit Low Voltage

DTC P0CBA
- Hybrid/EV Battery Temperature Sensor 16 Circuit High Voltage

Circuit/System Description

The hybrid/EV battery pack has 16 hybrid/EV battery temperature sensors. The hybrid/EV battery temperature sensors are located on the top of the hybrid/EV batteries. The temperature sensor is a variable resistor that measures the temperature of the hybrid/EV battery cell groups. The hybrid/EV battery interface control module supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid/EV battery temperature sensor resistance changes with battery temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The hybrid/EV powertrain control module 2 uses the battery temperature sensors to determine the hybrid/EV battery module temperature to control the battery cooling system operation.

Conditions for Running the DTC

P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P0BC4, P0BC5, P0C35, P0C36, P0C7E, P0C7F, P0C83, P0C84, P0C8A, P0C8B, P0C8F, P0C90, P0C94, P0C95, P0C99, P0C9A, P0CAA, P0CAB, P0CAF, P0CB0, P0CB4, P0CB5, P0CB9 and P0CBA
* The 12 V battery voltage is greater than 9 V.
* Hybrid/EV powertrain control module 2 and battery energy control module are awake and communicating
* None of the following DTCs are set: P1E93, P1E99, P1E9F, P1EA5, P1E8E, P1E94, P1E9A, or P1EA0
* 2nd Protection Self test is not running

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, P0C34, P0C7D, P0C82, P0C89, P0C8E, P0C93, P0C98, P0CA9, P0CAE, P0CB3, and P0CB8
* Propulsion System Off Time is greater than the calibration
* Propulsion System Off Time is not faulted (ECM clock diagnostics)
* Off Board Charging Off Time is greater than the calibration
* Off Board Charging Off Time is not faulted (hybrid/EV powertrain control module 2 clock diagnostics)
* Battery Thermal Conditioning Off Time is greater than the calibration
* Battery Thermal Conditioning Off Time is not faulted (hybrid/EV powertrain control module 2 clock diagnostics)
* None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P0C8E, P0C8F, P0C90, P0C93, P0C94, P0C95, P0C98, P0C99, P0C9A, P0CA9, P0CAA, P0CAB, P0CAE, P0CAF, P0CB0, P0CB3, P0CB4, P0CB5, P0CB8, P0CB9, P0CBA, P1E8E, P1E8F, P1E90, P1E91, P1E93, P1E94, P1E95, P1E96, P1E97, P1E99, P1E9A, P1E9B, P1E9C, P1E9D, P1E9F, P1EA0, P1EA1, P1EA2, P1EA3, P1EA5, P1EB1, P1EB2, P1EB3, P1EB4, P1EB5, U2401, U2603, U2604, U2605, U2606
* The average of the hybrid/EV battery temperature sensors shifts more than a calibrated amount.

Conditions for Setting the DTC

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, P0C34, P0C7D, P0C82, P0C89, P0C8E, P0C93, P0C98, P0CA9, P0CAE, P0CB3, and P0CB8
* The hybrid/EV battery temperature sensor is in normal operating range, but is 15°C (27°F) different from the other sensors.
* The difference between a hybrid/EV battery temperature sensor and the average of the other hybrid/EV battery temperature sensors is greater than a 10°C (18°F).
* The range of the hybrid/EV battery temperature sensor during the period the temperature average was shifting is less than a 1°C (2°F)

P0A9D, P0AC7, P0ACC, P0AEA, P0BC4, P0C35, P0C7E, P0C83, P0C8A, P0C8F, P0C94, P0C99, P0CAA, P0CAF, P0CB4, and P0CB9

The hybrid/EV battery temperature sensor is greater than 87.5°C (189.5°F).

P0A9E, P0AC8, P0ACD, P0AEB, P0BC5, P0C36, P0C7F, P0C84, P0C8B, P0C90, P0C95, P0C9A, P0CAB, P0CB0, P0CB5, and P0CBA

The hybrid/EV battery temperature sensor is -40°C (-40°F).

Action Taken When the DTC Sets

* DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P0C8E, P0C8F, P0C90, P0C93, P0C94, P0C95, P0C98, P0C99, P0C9A, P0CA9, P0CAA, P0CAB, P0CAE, P0CAF, P0CB0, P0CB3, P0CB4, P0CB5, P0CB8, P0CB9, and P0CBA are type B DTCs.
* If eight sensors fail, the vehicle will operate in a reduced power mode and electric only engine On (EV) (engine will be running continuously).

Conditions for Clearing the DTC

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, P0C7D, P0C7E, P0C7F, P0C82, P0C83, P0C84, P0C89, P0C8A, P0C8B, P0C8E, P0C8F, P0C90, P0C93, P0C94, P0C95, P0C98, P0C99, P0C9A, P0CA9, P0CAA, P0CAB, P0CAE, P0CAF, P0CB0, P0CB3, P0CB4, P0CB5, P0CB8, P0CB9, and P0CBA are type B DTCs.

Diagnostic Aids

Low or no coolant in the system may set a DTC P0A9D, P0AC7, P0ACC, P0AEA, P0BC4, P0C35, P0C7E, P0C83, P0C8A, P0C8F, P0C94, P0C99, P0CAA, P0CAF, P0CB4, or P0CB9.

Reference Information
Schematic Reference

Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference

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

Hybrid Cooling System Description and Operation Hybrid Cooling System Description and Operation
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
* EL-48571-25 - High Voltage Battery Pin Out Box

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

Circuit/System Verification

Vehicle in Service Mode, observe the scan tool Hybrid Battery 1-16 temperature parameters. The readings should be between -39 and +87°C (-38.2 and + 188.6°F) with no greater than a 15°C (27°F) difference between any of the temperature sensor readings.

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.


Note: Use the schematics to identify the correct drive motor battery interface control module, battery temperature sensor and battery section. Depending on the cell group not all 22 switch positions of the EL-48571-25 will be used. Unused positions will display infinite resistance.

Note: Use the schematics to identify the correct hybrid/EV battery interface control module and battery section.

1. Verify that DTC P0C47, P0CE2, P0CE3, P1E8C, P1EC6 P1EC7, or P1EC8 is not set.

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

2. Using the scan tool, determine which hybrid/EV battery temperature sensor is above 87.5°C (189.5°F).
3. Vehicle OFF, disable the high voltage at the A4 hybrid/EV battery pack. Refer to High Voltage Disabling High Voltage Disabling.
4. Disconnect the harness connector at the appropriate K112 hybrid/EV battery interface control module.
5. Connect the EL-48571-25 - high voltage battery pin out box.

Note:
* The DMM must be set to the DC voltage setting.
* Depending on the cell group not all 22 switch positions of the EL-48571-25 will be used.
* If working with battery section 2 the high voltage manual disconnect will need to be installed to insure proper cell group readings.

6. Insert the DMM probes into the EL-48571 test cavities.
7. Test for 9-13k ohm at 70°C (158°F) between each of the signal circuit and low reference circuit terminals. The resistance of each temperature sensor should be within the specified range, and within 25 ohm of each other.

• If not within the specified range, test the signal circuit and low reference circuits for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the A4 hybrid/EV battery pack.

8. If all circuits test normal, replace the appropriate K112 hybrid/EV battery interface control module.

Repair Instructions

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

* Auxiliary Battery Wiring Harness Replacement (Module Harness 1) Auxiliary Battery Wiring Harness Replacement (Module Harness 1)Auxiliary Battery Wiring Harness Replacement (Module Harness 2) Auxiliary Battery Wiring Harness Replacement (Module Harness 2)Auxiliary Battery Wiring Harness Replacement (Module Harness 3) Auxiliary Battery Wiring Harness Replacement (Module Harness 3)Auxiliary Battery Wiring Harness Replacement (Module Harness 4) Auxiliary Battery Wiring Harness Replacement (Module Harness 4)
* Drive Motor Battery Replacement and Shipping Preparation Procedures
* Control Module References Programming and Relearning for hybrid/EV battery interface control module replacement, programming and setup

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