Test C: DTC P0A7E - Hybrid Battery Pack Over Temperature

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

C1:

C2 - C3:

C4:

Normal Operation
With the key in the ON position and the engine ON or OFF, the vehicle climate control system is used to maintain a specific temperature range of the high voltage traction battery (HVTB). There are 2 internal fans in the HVTB that circulate climate controlled air within the HVTB so it can maintain a specific temperature range. 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 in which 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 temperature for the HVTB is 25°C (77°F) with a desired range of 20°C (68°F) to 30°C (86°F). The DTC window is -40°C (-40°F) to 55°C (131°F). If the HVTB temperature varies from this DTC window range, a DTC may be flagged. Also, a failure of any of the internal HVTB climate control components/circuitry may cause a DTC to be flagged.

Possible Causes
- Vehicle climate control system
- HVTB
- Clogged air filter