Question

What is Hybrid Battery Pack Cooling Fan Sense Circuit Low on my 2014 Buick LaCrosse 2.4L? I have the engine check light

Answer 1

The CK ENG LT that you may have is P0A84 this is  Hybrid  /  EV battery pack cooling fan control circuit low voltage, Depending on what code you set , what this does is control the temperature of the EV hybrid battery pack, this code when detected is a short circuit, with the fan speed control circuit.

Answer 2

P0A84 BUICK Code - Hybrid/EV Battery Pack Cooling Fan Control Circuit Low Voltage
Read more: https://www.autocodes.com/p0a84_buick.html