P0A7E
DTC P0A7E
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 P0A7E
-
Hybrid Battery Pack High Temperature
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
* The starter/generator control module and battery energy control module are awake and communicating
* None of the following DTCs are set: P0A9C, P0A9D, P0A9E, P0AC6, P0AC7, P0AC8, P0ACB, P0ACC, P0ACD, P0AE9, P0AEA, P0AEB, P0B45, P0B46, P0B47, P0B48, P0B4F, P0B50, P0B51, P0B52, P0B63, P0B64, P0B65, P0B66, P0B95, P0B96, P0B97, P0B98, P0B9F, P0BA0, P0BA1, P0BA2, P0BC3, P0BC4, P0BC5, P0C34, P0C35, P0C36, or P1A5D
Conditions for Setting the DTC
The battery temperature as measured by the temperature sensors is greater than 72.3°C (162.1°F)
Action Taken When the DTC Sets
DTC P0A7E is a type B DTC
Conditions for Clearing the DTC
DTC P0A7E is a type B DTC
Reference Information
Schematic Reference
Hybrid Cooling Schematics Hybrid Cooling Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
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
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Visually inspect the inlet and outlet of the hybrid/EV battery pack cooling fan ducts.
2. Verify the inlet and outlet are free of any debris or obstructions that will limit airflow through the duct.
• If any debris or obstructions are found
Remove the obstruction to allow proper airflow and allow the hybrid/EV battery pack to cool before retesting.
• If no debris or obstructions are found
3. Verify the hybrid/EV battery pack cooling fan ducts are properly secured and are not crimped, crushed, or deformed in a manner that will limit airflow through the duct.
• If the ducts are unsecured or damaged
Repair or replace as necessary and allow the hybrid/EV battery pack to cool before retesting.
• If the ducts are properly secured and undamaged
4. Ignition ON.
5. 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)
6. 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 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 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 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 High Voltage Disabling.
2. Using the scan tool, determine which battery temperature sensor is not between -39° and 60°C (-38.2 and 140°F).
3. Disconnect the X3 and X4 harness connectors at the K16 battery energy control module.
4. Test for 8-13k ohms at 22°C (71.6°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
1. Inspect the signal circuit and low reference circuit for a short to voltage, short to ground, or an open/high resistance.
• If a short to voltage, short to ground, or an open/high resistance is found, attempt to repair the circuit. If a repair cannot be made, replace the C4A hybrid/EV battery section 1 and C4B hybrid/EV battery section 2.
• If a short to voltage, short to ground, or an open/high resistance is not found
2. 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 Generator Battery Replacement
* Control Module References Programming and Relearning for battery energy control module replacement, programming, and setup