Hyundai Ioniq Hybrid adaptive cruise problems

Filed Aug 19, 2025 · Brakes, Transmission · 40,000 miles · CA

The contact owns a 2022 Hyundai Ioniq Hybrid. The contact stated that while operating the vehicle with the Smart Cruise Control activated, the EPB (Electronic Parking Brake) warning light activated. Additionally, while stopped, the EPB erroneously deactivated, causing the vehicle to drive forward, and the driver had to manually depress the brake pedal to stop the vehicle. The contact stated that the vehicle almost struck a pedestrian during the failure. The vehicle was taken back to the dealer who was unable to determine the cause of the failure. The contact stated that on another occasion, while driving at an undisclosed speed, the vehicle suddenly lost automotive power and was towed to the local dealer who diagnosed that the transmission was faulty and needed to be replaced. The vehicle was not yet repaired. The failure mileage was 40,000.

Filed May 13, 2024 · Brakes · MD

On a recurring basis, the warning lights come on for”AUTO HOLD” and “EPB” or emergency parking brake. Car continually beeps and gives warning until car is reset. During this time, the cruise control will turn off, causing safety issues during travel. Also, the other safety features seem to stop working during the time this warning is activated. Emergency stop, et cetera. Only activated when vehicle is operating under highway mph. Typically local roads with stops/starts trigger this issue. Mechanics have no idea what is wrong with vehicle warning. I see online that this is a common issues with Hyundai Ioniq. A possible recall is needed to investigate/fix this issue as local dealerships arent aware of a solution.

Filed Nov 2, 2023 · Brakes, Driver assistance · UT

The EPB light appeared on the dash panel of the car on 7/13/2023, along with the EPB light, the cruise control, the auto hold function, and the electric parking brake stopped functioning. The light will disappear on a restart and reappear after a period of time. It is indeterministic when the light will reappear on the dashboard. I have tried to contact the nearest dealer in an attempt to get the car inspected for safety reasons, however, the dealer was unavailable and Hyundai national customer service was unable to help. Hyundai's national customer service representative was also being deceptive as they transferred me to a dealer that is 425 miles away from the location I told them while giving me the impression that they were transferring me to a local dealer. The car was eventually inspected by two different Hyundai dealers. The first dealer informed me that there was a short on the wire which caused the error. However, due to the fact I was moving at the time, I could not wait for them to fix the car at that moment. They stated the vehicle was safe to drive and that I could bring the car to the new dealer once I moved to the new location. When I brought the car to the new dealer, instead of the wiring error, they stated that the radar of the car had failed. Since then, they have performed repairs on the car and the error has not yet occurred. This is a significant concern of safety due to various reasons. First, the electric parking brake is an important component of the car, as in the event of a break failure, the electric parking brake is the only backup to ensure the car can be stopped before any catastrophic event. Furthermore, according to the dealer, the actual component that has failed is the radar. However, I do not recall, at any moment, the car has warned me that the radar has failed. This could cause any reasonable person to assume the radar is functioning properly and believe that the forward collision-avoidance assist is still active with no

Filed Oct 25, 2023 · Driver assistance · 37,859 miles · WA · crash

The contact owns a 2020 Hyundai Ioniq. The contact stated that while driving 70 MPH with the adaptive cruise control and lane keep assist features activated, the check engine warning light suddenly illuminated and the steering wheel seized causing the driver to lose control of the steering and the vehicle crashed into a concrete barrier. After restarting the vehicle, the check engine warning light was no longer illuminated and the vehicle operated as normal. No injuries were reported and no police report was taken. The cause of the failure was not determined. The manufacturer and local dealer were not notified of the failure. The failure mileage was 37,859.

Filed Aug 6, 2023 · Acceleration, Driver assistance · OH

I’m driving with cruise control on the highway at 65 and all of a sudden it shuts off. The check cruise system light comes on along with a triangle with an exclamation point in the middle of it in the lower left side of dashboard and the letters EPB lights up on the lower right side of dashboard.

Filed Jul 12, 2023 · Brakes, Driver assistance · CA

While driving, the adaptive cruise control will randomly become disabled and 3 lights pop on: EPB, Auto Hold, and check engine (triangle with ! In the middle). Check engine light will turn off if ACC is turned of entirely. Problem will persist as long as car is on. Once turned off and restarted it will stay off for a while and then come back on. Stays off longer when car has an overnight break but other times it will happen as soon as it's turned on. Cruise control will not work when this issue appears. Picture shows milage but that was May 31st 2023, not the 1st time back in November, 2022. It happened the 1st time after a drive from Lancaster, CA to Pheonix, AZ on the return (about half way)

Filed Apr 14, 2023 · Acceleration · 69,000 miles · IA

The contact owns a 2019 Hyundai Ioniq Hybrid. The contact stated that while driving 72 MPH with the cruise control activated, the cruise control button became stuck, causing the vehicle to accelerate unintendedly. During the failure, the cruise control could not be disengaged using the cruise control button or while depressing the brake pedal. The contact stated that the vehicle would decelerate while depressing the brake pedal; however, after releasing the brake pedal, the vehicle would independently accelerate. The contact was able to stop the vehicle and turn off the vehicle to disengage the cruise control. The following day the failure recurred. The vehicle was taken to the local dealer who was unable to duplicate the failure. The vehicle was not repaired. The manufacturer was not yet contacted. The failure mileage was 69,000.

Filed Oct 10, 2022 · Acceleration, Electrical · WV

While on cruise control when climbing a hill, a warning appears telling me that the EV has failed and that I should stop driving the vehicle. At the time the warning appears the cruise control shuts off and the car slow dramatically. All 5 times this has happened the vehicles behind me have had to slam on their brakes in order to avoid running me over. Once it was a triaxle dump truck, fully loaded, he went off the right side of the road and almost hit the guardrails to avoid the collision. The car has been tested at our dealership (Jenkins Hyundai) and they have confirmed the issue.

Filed Aug 22, 2022 · Driver assistance, Electrical · OH

When driving down the highway the cruise control will turn off and it is during sunny days and has happened many times. The check lane following assist LFA system notice comes on, the smart cruise ctrl conditions not met notice come on, the check smart cruise control system notice comes on, auto hold, EPB and two triangles appear. Happened 4/2, 4/20, 6/9, 6/17. I have told service about it but they say there isn’t any problem.

Filed May 27, 2022 · Acceleration · NC

Driving on highway at 68 mph. Set cruise control and it raced speed up to 110 mph on its own. Cancelled cruise and tried to set at similar speed approximate 5 times with same result. Restarted car and gripe has not repeated in over 2,000 miles. Dangerous condition that should not be possible. Appears to be computer/software issue as no physical obstructions were present on cruise controls. I have a video of the incident, but cannot upload currently do to unsupported file type.