2023 Hyundai Sonata Hybrid

UNKNOWN- While driving on highway, from 70 mph speed the car suddenly lost acceleration and speed dropped. No response to accelerator. Even with pushing the accelerator high, car will go in high RPM and speed will barely reach 40 mph. I was lucky that there was no other vehicle behind me, especially heavy automobile like semi truck as it would have crashed in me from behind due to sudden propulsion loss. The car started working fine next day. I took it to dealer and they couldn't find any error code but said it could be 12V battery BMS software update and they updated it. They mentioned that this is NOT a safety issue which is mind-blowing and concerning as this is a MAJOR safety hazard. I would request you to investigate this further and if this is a software issue then please direct Hyundai to update this with all vehicles and cover the cost for those who have had to pay for it.

NHTSA ID

11704561

Incident

Dec 7, 2025

On 11/28/25 at approximately 6:30 pm, I was driving on a Highway 17 going about 60 mph when my car's engine completely shut down. a "Hybrid System Failure" warning flashed and my car was no longer drivable. The car was towed to the dealership. In mid October 2025, my car stopped running with the same "Hybrid System Failure" warning, but it happened in my driveway. The car was towed to the dealership and supposedly repaired.

NHTSA ID

11702405

Incident

Nov 28, 2025

The vehicle went in for repair at the dealership early July for a check engine light and DTC error code. It was revving high after being driven for more than 20 min or so and wouldn’t get to above 60 mph. Jerky, dangerous acceleration and deceleration seemingly out of nowhere. The dealership replaced the fuel pump which is what they said was causing the error. Today on August 10th, check engine light popped up again with a DTC error code. Weird acceleration and deceleration and general jerkiness when driving. Scheduled service appointment for next week.

NHTSA ID

11679707

Incident

Aug 10, 2025

The contact owns a 2023 Hyundai Sonata. The contact stated that while driving 75 MPH, the vehicle briefly lost motive power before downshifting to a lower gear. In addition, the engine revved independently. The contact was able to pull over to the side of the road and turned off the vehicle. The contact was able to restart the vehicle; however, the vehicle failed to exceed 60 MPH. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The failure persisted, and the vehicle was no longer being driven. The contact parked the vehicle at the residence. The contact started the vehicle and the check engine warning light illuminated. The manufacturer was not notified of the failure. The failure mileage was approximately 34,000.

NHTSA ID

11670632

Incident

Jun 26, 2025

Mileage

34,000 mi

Similar to other stories I’ve read online, my 2023 sonata broke down on the highway a minute after any error signal popping up, in a dangerous location on the highway with no shoulder. Plaza Hyundai dealership was first/last and only people to perform an oil change or service the car. They told me they wouldn’t take the car due to being full after the incident. A Different Hyundai dealership took the car and found the breakdown was due to a missing oil drain plug and the engine leaked all the oil, while noting they didn’t do the previous oil change and there was no external damages. Plaza Hyundai is refusing to claim responsibility and just trying to milk me for much money as possible/get me to purchase a new engine.

NHTSA ID

11652891

Incident

Mar 31, 2025

I BOUGHT THIS CAR BRAND NEW IN NOVEMBER 2023, BY FEBRUARY, THE CAR STARTED STALLING ON THE STREETS/HYWAY. ALL DASH LIGHTS WOULD COME ON, THE VEHICLE WOULD STALL AND IS NO LONGER ABLE TO RESTART. THIS HAPPENED 4 TIME IN 2024. WHEN I TOW IT TO THE DEALER, THEY ALWAYS COME BACK WITH THE SAME ANSWER. ''THE AC MOTOR POWER CABLE HAS BEEN DISCONNECTING LEADING TO LOSE OF POWER''. THEY HAVE REPLACED IT 4X BUT THE SAME PROBLEM PERSIST. IT'S VERY SCARY ESPECIALLY WHN AM DRIVING IN A BUSY ROAD OR WHEN AM DRIVING AT NIGHT IN THE MIDDLE OF WINTER. AM NOT SURE HOW TO MOVE FROM HERE. THANKS.

NHTSA ID

11636797

Incident

Jan 18, 2025

The push button shifters do not shift gears, unless the brake is depressed. On a slight incline, it is natural to shift from forward to reverse without braking leaving the driver in the wrong gear. So I have often started forward expecting to go backwards. I accidently ran over a portable toilet trying to quickly reverse out of a driveway on a slight incline. I hope no one has run over a person this way. I have had other close calls. This system is far more dangerous than lever style shifters. Even a little mistiming between brake and shift can leave the car going the wrong way.

NHTSA ID

11627724

Incident

Nov 6, 2024

At 82,000 miles car started to consume coolant. Had EHRS TBS performed coolant no longer leaking. Thi is the 2nd car that had this coolant issue.

NHTSA ID

11609732

Incident

Aug 2, 2024

This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system. Refer to the 2026 1st Navigation Map and Software Update Key Improvements and Additional Improvements tables in this TSB for a list of specific changes. The software can be downloaded via Navigation Updater (NAU) and updated by USB.

The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co., Ltd. (DTN). These inflators were not supplied, approved, or authorized by the vehicle manufacturers and have primarily been found in vehicles that previously experienced a crash and underwent airbag replacement using non-genuine parts. These dangerous inflators have ruptured during deployment, posing a serious risk of injury or death due to metal fragments entering the vehicle cabin. To date, Hyundai is aware of three people who have died while driving a Hyundai vehicle with one of these substandard replacement airbag inflators that deployed in what likely would have been a survivable crash. NHTSA has issued a public advisory urging vehicle owners and service professionals to have vehicles inspected if there is reason to believe that a non-genuine replacement airbag may have been installed. Vehicles with salvage or rebuilt titles, prior airbag deployments, or unknown repair histories may present a higher risk. NHTSA strongly cautions against self-inspection by vehicle owners and recommends inspection by trained technicians.

The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co., Ltd. (DTN), that have been identified in U.S. vehicles following prior crashes, theft, or non‑certified airbag replacements. These inflators are not approved for use, may rupture during deployment, and have caused serious injuries and fatalities. Please see attached announcement, provided by NHTSA, for more details.

Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for DTC P218100 (Cooling System Performance) related to the Integrated Thermal-Management Module (ITM). Follow the service procedure in this bulletin to install a spring onto the thermostat within the ITM, in order to prevent premature opening, and perform an ECU software update on affected vehicles.

This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside the lamp assembly. Lamp assembly replacement is NOT necessary in most cases. This condition can be eliminated by turning on the lamps with the engine running for several minutes or during normal driving operation.

This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system as described in this TSB.