Hyundai Elantra Hybrid adaptive cruise problems

Filed Sep 17, 2026 · Acceleration · 14,000 miles · OH

The contact owns a 2024 Hyundai Elantra Hybrid. The contact stated that while driving with cruise control activated, the vehicle lost motive power and failed to accelerate properly. Additionally, the engine vibrated abnormally, smoke emanated from under the hood, the message "Reduced Speed" was displayed, and the check engine warning light illuminated. The vehicle was parked on the side of the road, and a tow truck and a State Trooper arrived at the scene. The vehicle was towed to a local dealer, where it was diagnosed that the throttle had failed and needed to be replaced. The throttle was replaced and the vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 14,000.

Filed Sep 15, 2026 · Electrical · VA

The vehicle's cruise control, which was set at 63 mph, set itself to 110 mph and began to accelerate before I turned it off. I reset the cruise control, and it happened again immediately afterwards.

Filed Apr 22, 2025 · Acceleration · SC

The cruise control function ceased to properly function after automatically increasing the speed to 110 mph. The vehicle is available for inspection upon request. This is a safety risk for myself and for others on the road. If another combination with this fault were to occur (either physically to the driver or to the software), this could lead to an extreme hazard due to the potential for excessive speeds. The first occurrence for this vehicle happened on 4/21/2025; however, additional instances have been reported going back at least a year for other owners of this same model. Initial issue occurred while setting cruise control from 45 mph to 35 mph and then back to 45 mph. The last instance of 45 mph is when the cruise control quickly increased the set speed to 110 mph. The set speed could not be reduced after the issue occurred. This issue is difficult to reproduce, but will always occur after the first instance until the vehicle is restarted. The vehicle has not yet been inspected by the manufacturer. This is a known issue that has occurred for more than a year now. It appears to not be addressed due to the lack of reproducibility. However, when the software issue happens, it is continually reproducible until the vehicle is restarted. No other warning lamps or erroneous events occurred at the time of the software malfunction.

Filed Feb 8, 2025 · Driver assistance · SD

My Hyundai Elantra hybrid has had the horn and front radar go out 3 times. It will eventually start working again. Heavy rain or snow will disable the front radar and then it won’t go away for a while. When the front radar is out, I cannot use cruise control. It is disabled. I feel adaptive cruise control is much safer and cruise control in general. Apparently many people have similar issues. The horn not working often is also a huge concern. I am concerned I cannot rely on my car.

Filed Feb 5, 2025 · Acceleration · UT

Sometimes when the cruise control is turned on the car starts the cruise setting at 110mph and then starts accelerating the vehicle to that speed. It does not allow the mph setting to be turned down using the controls on the steering wheel, the only way to take it out of the stuck 110 mph setting is by turning cruise control off or braking. This situation happens rarely but does occur with only the cruise control being turned on, without any further prompt. I have a video of the occurance but the website does not allow me to upload a video.

Filed Oct 24, 2024 · Driver assistance, Electrical · SC

At around 93k miles my HECU unit apparently malfunctioned at the same time as the left front tire speed indicator. All of my safety features ABS, adaptive cruise control, lane departure, lane keeping etc do not work because of this.

Filed May 20, 2024 · Acceleration · NY

Issue: manually setting cruise control to current speed (say 55mph) sets the cruise to 110mph . This has happened more than 10 times in 2 years of my ownership. This happens randomly and not possible to reproduced on-command. The dealers have refused to note this info and send it to Hyundai for investigation. Car accelerating to 110mph all of a sudden while you expect it to stay at your current speed can make one loose control of the vehicle, drive off the road if this happens near a sharp bend and potentially hitting other cars. This issue has definitely put the safety of me and other were put at risk. I believe this is a software issue and the dealers cant diagnose this on the spot. Hyundai does not seem to collect such non-reproducible complaints on their end which is really irresponsible.

Filed Mar 11, 2024 · Driver assistance · UT

Driving on a highway at 80mph, adaptive cruise control was engaged. It was a clear, sunny day, around 55 degrees F outside. We were 3.5 hours into a 4 hour drive. There were no cars in front of the vehicle. There were other cars in the lanes immediately to both the left and right of us, as well as a car behind us. The car gave a warning for Automatic Emergency Braking, although there was nothing to avoid. No vehicles were merging into us, no one was going to rear end us, and nothing was in front of us in or near our lane. The car then started braking automatically and attempting to swerve/turn automatically. I had to fight the automatic system to stay in our lane and not crash into the vehicles immediately to the left and right. This was extremely dangerous at highway speeds.

Filed Feb 20, 2024 · Driver assistance, Electrical · PA

I was driving on the Highway at the posted speed limit when the warning "Check Forward Safety System" came up and remained on my dashboard. The cruise control stopped working also. The light remained on even after stopping and starting the car and has remained on ever since. I have never been in an accident nor has my computer system reported any collision. My Hyundai Blue Link app gives me the following DTC: C162078. It started on [XXX]. My collision detection system does not appear to be working at all and my cruise control no longer works. I'm very concerned about it malfunctioning based on other entries on the website. I took the car to Hyundai Service Center and they are trying to convince me this is due to a collision and warranty will not be covering it. They tried to charge me for diagnostic even though I already had the error code on the Hyundai BlueLink App. They confirmed that my computer has zero reports of any collisions. The service tech said, and I'm quoting, "The system is very sensitive and a swift kick could cause it to malfunction." That sounds like a manufacturing defect to me. I have never been in an accident with this car, there is zero visible damage to the front bumper, and my computer has no report of an accident. The dealership urged me to contact insurance. My Major Insurance Company told me this was absurd, would never be approved, and is clearly mechanical. They also mentioned anecdotally that this problem has been coming up a lot for them with modern Hyundai models. Then I called Hyundai Corporate and they have escalated the issue, agree it sounds mechanical, and will be contacting me in 3-5 business days. They apologized profusely so I am still holding out hope for warranty coverage. I believe the dealership is trying to blame me for this mechanical failure to avoid expense on their end. I have had many software-related issues with this car. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 22, 2023 · Acceleration, Electrical · 18,000 miles · NY

The contact owns a 2023 Hyundai Elantra. The contact had received notification of the federal safety agency Campaign Number: 23V589000 (Electrical System, Vehicle Speed Control) and the recall repair was completed by a dealer. The contact stated while driving at approximately 60 MPH with the cruise control activated, she momentarily disengaged the cruise control to slow for traffic. The contact stated that when the cruise control was re-engaged, the vehicle independently accelerated to almost 100 MPH. The contact was able to slow the vehicle by tapping the brake pedal. The contact stated the failure became a recurring failure. The contact stated no warning light was illuminated. The local dealer who completed the recall repair was contacted and informed the contact that there was no available appointment until December 16, 2023, for the vehicle to be serviced. The vehicle was not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 18,000.