2017 Hyundai Sonata: adaptive cruise control problems

Filed Jun 11, 2026 · Airbags, Steering · MD

The RED light is lit on the dashboard for the airbag. Unable to use steering wheel electronic features which helps with and was designed for hands free controls. I am unable to cycle through the electronic features or engage the cruise control due to the steering wheel electronics are in-op. Please help and get a recall started. This is not on the consumer.

Filed Feb 23, 2024 · Engine · KY

Had cruise control set for 75mph, and while traveling up hill, the car downshifted to maintain speed. After 10-15 seconds I noticed power loss and the check engine began to flash. Disengaged cruise control and pulled off onto the shoulder once I found a safe place to do so. As I was slowing down, there was a very noticeable misfire from the engine and was trying to stall out while still in motion. There was no knocking sound, nor was the car overheating. Once I was fully stopped, the car died and would not start back. Had the car towed back to my house. Replaced spark plugs because cylinders 2 and 4 were not firing properly. Also rotated coil packs around to see if they were failing. Cleared check engine codes but they immediately came back to misfires on cylinders 2 and 4. Did compression tests and found that cylinder 2 had 0psi and cylinder 4 had 20psi. Car was not low on oil and no other warning lamps were on.

Filed Aug 10, 2021 · Acceleration · CA

Important: This is hybrid vehicle. With the cruise control set to maintain a constant speed and while descending a long hill, the vehicle speed is maintained using dynamic braking by charging the battery. But if the grade is long - such as on CA 101 just north of San Luis Obispo, (locally referred to as the Questa Grade) there will come a time when the battery “gas gauge” reaches 100 % at which time the dynamic braking ceases and without warning the vehicle’s speed gradually increases and can reach excess speeds. If you are not paying attention to the speedometer the speed can become excessive in a hurry.

Filed May 12, 2020 · Acceleration · 5,000 miles · GA

Issue: cruise control speeds up too much going uphill, and slows down too much going downhill. Description: I set my cruise control to 75mph, the car will go over 77mph when going uphill, and slows down below 73mph when going downhill without any driver input. This doesn't occur on other gasoline only hyundai I drove such as santa fe. It only happens on my sonata hybrid. I guess hyundai may need to look into how the electric motor works with cruise control.

Filed Feb 5, 2020 · Acceleration · 2,000 miles · NH

Tl* the contact owns a 2017 hyundai sonata. While driving 65 MPH with the adaptive cruise control engaged and changing lanes, the vehicle independently slowed without warning. The contact called key hyundai of salem 470 s broadway, salem, nh 03079 (603) 841-3099, however the vehicle was not diagnosed nor repaired. The manufacturer was contacted but no further assistance was provided. The failure mileage was 2,000.

Filed Feb 18, 2019 · Acceleration, Engine · 27,000 miles · MD · crash

I was driving very slowly to make a turn into my garage when the car accelerated on its own and hit the side of my house breaking through a patio guard rail. The front wheels of the car went over the bulkhead. Insurance company sent a wrecker to retrieve the vehicle. The insurance company totaled the car. This unintended acceleration had occurred once when I was driving on a state road in cruise control when the car accelerated beyond the set cruise control speed. This occurred again on the day before the accident. This unintended acceleration had also occurred when my husband was driving the car while in speed control.

Filed Jan 28, 2018 · Electrical · 60 miles · FL

Autonomous emergency braking system (aeb) does not work on streets or highway. I have 10 dash cam video's that show no alarms when coming up on stopped obstructions. Car has been in shop 3 times and dealer reports that there is nothing wrong with the cruise control and refuses to demonstrate that it is working normally. I will be happy to upload the video's however the file type is not one of your types below.