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Pinpoint Test C: DTC P0A7E




High-Voltage Traction Battery

Pinpoint Test C: DTC P0A7E

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information Electrical Diagrams.

Normal Operation

With the ignition switch in the ON position and the engine ON or OFF, the vehicle climate control system maintains the High Voltage Traction Battery (HVTB) temperature in a specific range. The HVTB (High Voltage Traction Battery) has 2 internal fans that circulate climate controlled air within the HVTB (High Voltage Traction Battery) so a specific temperature range is maintained. A battery compartment thermistor is hardwired to the HVTB (High Voltage Traction Battery) for the battery compartment temperature input. The HVTB (High Voltage Traction Battery) also monitors the battery compartment blend door actuator in order to determine the direction the HVTB (High Voltage Traction Battery) operates the battery blend door motor. The battery blend door controls whether the air flowing into the battery compartment is fresh air or recirculated air. A battery thermal expansion solenoid valve also controls the refrigerant pressure, thereby controlling the incoming air temperature. The ideal HVTB (High Voltage Traction Battery) temperature is 25°C (77°F) with a desired range of 20°C (68°F) to 30°C (86°F).

- DTC P0A7E (Hybrid Battery Pack Over Temperature)- The HVTB (High Voltage Traction Battery) temperature window is -40°C (-104°F) to 55°C (131°F). If the HVTB (High Voltage Traction Battery) temperature exceeds 55°C (131°F) and the vehicle is driven aggressively, the Battery Control Module - High Voltage Traction Battery (BCM-HVTB) may set this DTC and if the HVTB (High Voltage Traction Battery) temperature exceeds 57°C (135°F), the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) may shut the vehicle down.

This pinpoint test is intended to diagnose the following:

- Vehicle climate control system

- HVTB (High Voltage Traction Battery) internal fans

- HVTB (High Voltage Traction Battery)

PINPOINT TEST C : DTC P0A7E

C1 VERIFY THE VEHICLE CLIMATE CONTROL SYSTEM IS OPERATING CORRECTLY

- Start the engine.

- Turn the A/C system to MAX A/C.

- NOTE: Allow the climate control system to reach normal operating temperature (stabilized).
With the engine running at 2,000 rpm, place a thermometer in the center climate control outlet vents and monitor the outlet temperature.


Is the outlet temperature between 0°C and 9°C (32°F and 48°F)?

Yes
GO to C2.

No
REFER to Heating and Air Conditioning to continue diagnosis of the vehicle climate control system.

C2 VERIFY THE HVTB (High Voltage Traction Battery) INTERNAL FANS ARE OPERATIONAL

NOTE: Use a stethoscope or equivalent listening device to probe the HVTB (High Voltage Traction Battery) area while the self-test is proceeding.

- Enter the following diagnostic mode on the scan tool: Self Test- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- NOTE: The cooling fans may cycle on or off with the ignition switch in the ON position and the engine ON or OFF.
With the ignition switch in the ON position and the engine ON or OFF (the engine must have run at least once after the key was cycled to ON), verify the HVTB (High Voltage Traction Battery) internal fans are operating correctly.


Are the HVTB (High Voltage Traction Battery) internal fans operating correctly?

Yes
GO to C3.

No
GO to Pinpoint Test D Pinpoint Test D: DTCs P0A81 Or P0A96.

C3 CHECK THE HVTB (High Voltage Traction Battery) TEMPERATURE

- Enter the following diagnostic mode on the scan tool: DataLogger- BCM-HVTB (Battery Control Module - High Voltage Traction Battery).

- With the engine running, monitor the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) AVG_TEMP PID.

Is the BCM-HVTB (Battery Control Module - High Voltage Traction Battery) AVG_TEMP PID less than 55°C (131°F)?

Yes
GO to C4.

No
REFER to Heating and Air Conditioning to continue diagnosis of the vehicle climate control system.

C4 CHECK FOR CORRECT BCM-HVTB (Battery Control Module - High Voltage Traction Battery) OPERATION

NOTE: This pinpoint test step only addresses the 40-pin connector for the BCM-HVTB (Battery Control Module - High Voltage Traction Battery). It is not necessary to disconnect the high-voltage connectors when following this pinpoint test step procedure.

- Disconnect BCM-HVTB (Battery Control Module - High Voltage Traction Battery) electrical connector C4227A.

- Check for:
- corrosion.

- pushed-out pins.


- Connect BCM-HVTB (Battery Control Module - High Voltage Traction Battery) connectors C4227A and make sure it seats correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new HVTB (High Voltage Traction Battery). REFER to High-Voltage Traction Battery . TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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