The mode means the vehicle at stop. (There is no energy flow.)
Kia Niro 2017 (DE HEV) Service Manual: Description and operation
Description
The Dual Clutch Transmission (DCT) control system measures data required for
identifying the state of control target and computes the appropriate compensation
value if adjustment is necessary.
The actuator is controlled according to the computed compensation value to o ...
Kia Niro 2017 (DE HEV) Service Manual: Coolant Repair procedures
Refilling And Bleeding
Never remove the cap when the engine is hot. Serious scalding could be
caused by hot fluid under high pressure escaping from the reservoir.
  ...