Two problems related to assist have been reported for the 2020 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 Hyundai Sonata based on all problems reported for the 2020 Sonata.
The driver seat belt pops out sometimes for reasons unknown. The speakers suddenly stop working at random times so I got lost while listening for navigation directions safely paying attention to the road instead of watching the screen for upcoming turns. And the biggest one, a few times I almost crashed into oncoming cars and guard rails because if the road has a dip the Sonata decides to jerk hard to the side and overcorrect itself when lane assist is on. When the road is level it just beeps annoyingly loudly when it can't see the lines or you accidentally cross over it, but does not actively assist even tho active lane assist is on. This is a major safety issue!!!!!.
Gases from the dashboard heating cause a film to form between the windshield and the camera. Because of this, in heavy direct sunlight, lane keep assist toggles on and off without warning causing unintended lane departures with out warning. Also, when using Smart cruise control, the vehicle slows to a stop but may continue moving slowly even after displaying the press gas to continue screen. The auto hold light does not illuminate.