Kia Sportage: Cruise control system / To cancel cruise control, do one of the following

Kia Sportage QL (2015-2020) Owners Manual / Driving your vehicle / Cruise control system / To cancel cruise control, do one of the following

Depress the brake pedal.
Shift into N (Neutral) with an Automatic Transaxle.
Press the CANCEL switch.
Decrease the vehicle speed lower than the memory speed by 12 mph (20 km/h).
Decrease the vehicle speed to less than approximately 15 mph (25 km/h).

Each of these actions will cancel cruise control operation (the SET indicator light in the instrument cluster will go off), but it will not turn the system off. If you wish to resume cruise control operation, move the lever up (to RES+). You will return to your previously preset speed.

To temporarily accelerate with the cruise control on

If you want to speed up temporarily when the cruise control is on, depress the accelerator pedal. Increased speed will not interfere with the cruise control operation or change the set speed. To ...

To resume cruising speed at more than approximately 20 mph (30 km/h)

If any method other than the CRUISE ON-OFF switch was used to cancel cruising speed and the system is still activated, the most recent set speed will automatically resume when you move the lever ...

Other information:

Kia Sportage QL (2015-2020) Service Manual: Cruise Control Switch Repair procedures

Inspection 1. Check for resistance between terminals in each switch position (RH). [RH : Trip + Cruise] Switch Connector terminal Resistance (±5%) ...

Kia Sportage QL (2015-2020) Service Manual: MDPS ECU Repair procedures

Replacement 1. Disconnect the battery negative cable. 2. Remove the crash pad lower panel. (Refer to Body - "Crash pad lower panel") 3. Disconnect the MDPS ECU connector (A). ...