The vehicle is being slowed by engine compression.
(Wheel ➞ Engine)
Kia Niro 2017 (DE HEV) Service Manual: AVN Antenna Repair procedures
Removal
Roof antenna
1.
Disconnect the negative (-) battery terminal.
2.
Remove the roof trim assembly.
(Refer to Body - "Roof Trim Assembly")
3.
Disconnect the roof antenna cable and connectors (A).
...
Kia Niro 2017 (DE HEV) Service Manual: ETC (Electronic Throttle Control) System Repair procedures
Inspection
Throttle Position Sensor
(TPS)
1.
Connect the KDS/GDS on the Data Link Connector (DLC).
2.
Start the engine and measure the output voltage of TPS 1 and 2 at C.T.
and W.O.T.
[Throttle Position
Sensor (TPS)]
...