Hyundai Sonata: Cruise Control / Cruise Control will be canceled when

Hyundai Sonata LF 2014-2019 Owners Manual / Driving your vehicle / Cruise Control / Cruise Control will be canceled when

Depressing the brake pedal.
Pressing the CANCEL switch located on the steering wheel.
Pushing the CRUISE button. Both the CRUISE indicator and the SET indicator will turn OFF.
Moving the shift toggle switch into N (Neutral).
Decreasing the vehicle speed lower than the memory speed by 5 mph (10 km/h).
Decreasing the vehicle speed to less than approximately 20 mph (30 km/h).
The ESC (Electronic Stability Control) is operating.
Downshifting to the 2nd gear in Manual shift mode.

Information

Each of the above actions will cancel Cruise Control operation (the SET indicator light in the instrument cluster will go off), but only pressing the CRUISE button will turn the system off. If you wish to resume Cruise Control operation, push the toggle switch up (RES+) located on your steering wheel. You will return to your previously preset speed, unless the system was turned off using the CRUISE button.

To decrease Cruise Control speed

Push the toggle switch (1) down (SET-) and hold it. Your vehicle will gradually slow down. Release the toggle switch at the speed you want to maintain. Push the toggle switch (1) down (SET-) and ...

To resume preset Cruising speed

Push the toggle switch (1) up (RES+). If the vehicle speed is over 20 mph (30 km/h), the vehicle will resume the preset speed. ...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Troubleshooting
Troubleshooting SymptomSuspect areaRemedyEngine misfire with abnormal internal lower engine noises.Loose or improperly installed engine flywheel.Repair or replace the flywheel as required.Worn piston rings.(Oil consumption may or may not cause the engine to misfire.)Inspect the cylinder for a l ...

Hyundai Sonata LF 2014-2019 Owners Manual: AUTO HOLD
This feature keeps the brake applied when the shift lever is in D (Drive), N (Neutral) or Manual shift mode with the feature enabled and when the brake pedal has been depressed to stop the vehicle. To apply: 1. Press the [AUTO HOLD] switch. The AUTO HOLD indicator will illuminate white and the s ...