Pinpoint Test 11: DTC P0A7E - Hybrid Battery Pack Over Temperature

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PINPOINT TEST 11: DTC P0A7E - HYBRID BATTERY PACK OVER TEMPERATURE

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 has 2 internal fans that circulate climate controlled air within the HVTB so a specific temperature range is maintained. A battery compartment thermistor is hardwired to the HVTB for the battery compartment temperature input. The HVTB also monitors the battery compartment blend door actuator in order to determine the direction the HVTB 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 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 temperature window is -40°C (-104°F) to 55°C (131°F). If the HVTB temperature exceeds 55°C (131°F) and the vehicle is driven aggressively, the battery control module (BCM) may set this DTC and if the HVTB temperature exceeds 57°C (135°F), the BCM may shut the vehicle down.

Possible Causes
- Vehicle climate control system
- HVTB internal fans
- HVTB

Diagnostic Procedure

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Step 4: