Там же вроде бы через настройки в голове это меняется без каких-то проблем...
Setup -> Vehicle -> Engine Assist Heat
If equipped, this feature selects the outside temperature level at which the engine may run to assist heating in Electric Mode. A change in selection will not take effect until after the vehicle is first powered down. Select On for temperatures below approximately 2 °C (35 °F), or select Deferred for temperatures below approximately −10 °C (15 °F).