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P0ACD





DTC P0A9C-P0A9E, P0AC6-P0AC8, P0ACB-P0ACD, P0AE9-P0AEB, P0BC3-P0BC5, or P0C34-P0C36

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

Diagnostic Fault Information






Circuit/System Description

Six temperature sensors are used to monitor the battery temperature. The battery temperature sensors are located in the battery sections. Two of the temperature sensors are located on the top of the battery section and the remaining four are located on the bottom of the section. The temperature sensor is a variable resistor that measures the temperature of the battery cell group. The Battery Energy Control Module supplies 5 V to the signal circuit and a ground for the low reference circuit. The battery temperature sensor resistance changes with battery temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases.

Conditions for Running the DTC

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, and P0C34

* Starter/generator control module off time is greater than six hours

* Starter/generator control module off time is not faulted (Starter/Generator Control Module internal clock diagnostic)

* None of the following DTCs are set: P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P0B45, P0B46, P0B47, P0B48, P0B4F, P0BC4, P0BC5, P0C35, P0C63, or P1A5D

P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P0BC4, P0BC5, P0C35, and P0C36

* The 12 V battery voltage is greater than 8.8 V

* Battery energy control module is awake and communicating

* DTC P1A5D is not set

Conditions for Setting the DTC

P0A9C, P0AC6, P0ACB, P0AE9, P0BC3, and P0C34

The difference between a single battery temperature sensor and an average of the other battery temperature sensors is greater than 8.6°C (47.5°F)

P0A9D, P0AC7, P0ACC, P0AEA, P0BC4, and P0C35

The hybrid battery temperature sensor is greater than 87°C (188.2°F)

P0A9E, P0AC8, P0ACD, P0AEB, P0BC5, and P0C36

The hybrid battery temperature sensor is less than -39°C (-38.2°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, and P0C36 are type B DTCs

Conditions for Clearing the DTC

DTCs P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0BC3, P0BC4, P0BC5, P0C34, P0C35, and P0C36 are type B DTCs

Reference Information

Schematic Reference

Hybrid/EV Cooling Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left

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 Control Module References for scan tool information

Special Tools

EL-48900 - HEV Safety Kit

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool Battery Energy Control Module Battery Temperature parameters are all be between -39° and 60°C (-38.2 and 140°F).

• If not between -39° and 60°C (-38.2 and 140°F)
Refer to Circuit/System Testing.

• If between -39° and 60°C (-38.2 and 140°F)

3. All OK.

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 includes the following steps:


* 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 may result in serious injury or death.


Danger: The eAssist battery pack assembly will utilize an exchange program. Please consult the most recent revision of bulletin/PI# PIC5520, available in Service Information (SI), for a list of approved eAssist battery pack assembly service procedures. Components that may be removed and serviced without exchanging the complete battery pack assembly are identified in the bulletin/PI. Please contact the GM Technical Assistance Center (1-877-446-8227) if you have any questions.


Note: In High Voltage Disabling , perform the disabling procedure for servicing components within the A4 Hybrid/EV Battery Pack. The C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2 will be disconnected as part of the disabling procedure.

1. Ignition OFF, disable the high voltage at the A4 Hybrid/EV Battery Pack. Refer to High Voltage Disabling .

2. Determine which battery temperature sensor is not between -39° and 60°C (-38.2 and 140°F) by observing the scan tool Battery Energy Control Module Battery Temperature parameters.

3. Disconnect the X2 and X3 harness connectors at the K16 Battery Energy Control Module.

4. Test for 8-13k ohms at 19-24°C (66.2-75.2°F) between the appropriate temperature sensor signal circuit terminal and the low reference circuit terminal listed below:

* Temperature sensor 1 - Signal circuit terminal 2 X2 and low reference circuit terminal 7 X2

* Temperature sensor 2 - Signal circuit terminal 1 X2 and low reference circuit terminal 6 X2

* Temperature sensor 3 - Signal circuit terminal 4 X2 and low reference circuit terminal 9 X2

* Temperature sensor 4 - Signal circuit terminal 2 X3 and low reference circuit terminal 7 X3

* Temperature sensor 5 - Signal circuit terminal 1 X3 and low reference circuit terminal 6 X3

* Temperature sensor 6 - Signal circuit terminal 4 X3 and low reference circuit terminal 9 X3

• If not between 8-13k ohms
Replace the C4A Hybrid/EV Battery Section 1 and C4B Hybrid/EV Battery Section 2.

• If between 8-13k ohms

5. Replace the K16 Battery Energy Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Generator Battery Replacement

* Control Module References Control Module References for Battery Energy Control Module replacement, programming, and setup

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