P1EC6 BUICK - Hybrid/EV Battery Pack Heater Performance
- Faulty Hybrid/EV Battery Pack
- Hybrid/EV Battery Pack harness is open or shorted
- Hybrid/EV Battery Pack circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1ec6 Buick DescriptionThe hybrid/EV battery contains 5 high-voltage contactors and 2 transistors. The high-voltage contactors allow the high-voltage DC batteries to be connected to the vehicle or safely contain the high-voltage DC within the hybrid/EV battery assembly. The 5 high-voltage contactors are a main positive high-voltage contactor, main negative high-voltage contactor, charge positive high-voltage contactor, charge negative high-voltage contactor and multi-function high-voltage contactor. The 2 transistors are the precharge transistor and heater transistor. These contactors/transistors close and open in sequence and are controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high-voltage contactors/transistors. Earth is provided through the case earth.
The hybrid/EV battery pack coolant heater is mounted to the coolant inlet on the back side of the hybrid/EV battery contactor assembly. The hybrid/EV battery pack coolant heater uses a 360 V power source.
After the ignition is turned ON, the hybrid/EV battery pack coolant heater is commanded ON. The hybrid/EV powertrain control module 2 monitors the temperature change at the hybrid/EV battery pack coolant temperature sensor 1 to determine if the hybrid/EV battery pack coolant heater is functioning properly.
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