I have had a new engine put in my Sonata back at the beginning of 2023. For the past two days my car will jerk really hard, and then loose power not accelerating over 25 rpms and my check engine lights comes on when it jerks really hard.

- Morganton, NC, USA

My 2018 sonata has been stalling out while I-??m driving more so when I accelerate.I have a baby that I-??m scared to drive with in the car because it does it randomly. It has been happening more & more everyday. I got new parts/starter etc. No codes on dash. Have an appointment next week with Hyundai to take a look.

- Euless, TX, USA

Engine takes a long time to start up, about 10-15 seconds of pushing the start button starts engine which is probably not good for the car. Also, the car jolts/ wants to stop while driving. Has been an ongoing issue since the week of 9/5/22. Loss of motor power issue sounds like what is going on with my 2018 Hyundai Sonata vehicle.

- Henderson , NV, USA

The contact owns a 2018 Hyundai Sonata. The contact stated that while her daughter was reversing out of a parking space, the vehicle experienced unintended acceleration. The vehicle drove forward and crashed into a brick post. The contact's daughter did not sustain any injury but later received medical attention. There were no airbags deployed. A police report was filed. The vehicle was towed to a tow yard where the dealer later picked up the vehicle and took it to their location. The contact was unaware of what was repaired since the dealer did not provide a work order and she had to sign a power of attorney for the dealer to release the vehicle. The failure recurred with unintended acceleration up to 25 MPH, immediately after the brake pedal was released. The vehicle was not repaired. The insurance company did not deem the vehicle totaled. The manufacturer was not made aware of the failure. The failure mileage was approximately 41,000.

- Harlingen, TX, USA

The contact owns a 2018 Hyundai Sonata. The contact stated that while braking and pulling into a parking space, the vehicle reeved up, accelerated forward, and crashed into a wall. There were no reported injuries, or air bag deployment. The vehicle was towed to the local dealer where they were unable to duplicate the failure after a road test. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 20,000. Consumer stated crash was due to electronic malfunction. Auto will be assessed by Hyundai Corp case still open.

- Arroyo Grande, CA, USA

2018 Hyundai Sonata. Consumer writes in regards to unintended acceleration. The consumer stated the while attempting to make a right turn into a parking space the vehicle accelerated rapidly. The consumer attempted to stop the vehicle by applying the brakes, but to no avail. The vehicle crashed over concrete parking barriers into an embankment with shrubs and was stopped by a tree angled upwards. The dealer was contacted and did not offer any assistance.

- North Andover, MA, USA

On five separate occasions while driving on the highway the vehicle will loose power and ability accelerate with a flashing engine light. These incidents have almost caused me to be rear ended three times because you are not able to accelerate above 60mph in rush hour traffic on a busy interstate and the ability just stops quickly with no warning. The vehicle also has been having the rpms drop to 0 and shoot back up while braking, and while driving it is tough to accelerate and then you will feel a noticeable 'kick' and the rpms will shoot up drastically before it will accelerate. I have had 2 software updates done, a new wire harness, knock sensor cleaning and a knock sensor replacement. The engine code is always the same 1326.

- Phoenix, AZ, USA

On 2 different days the car killed on the highway. Both times the Hyundai service dept. Looked at it. The first time, they said the software update that was worked on a few months previous, had a glitch in it. The second time they said they didn't know why it happened. While driving the rpms will race up but the car doesn't move much. They said it didn't do that when they drove it. Also since the first software update was done, if I drive 80mph (on the interstate hwy.) the seats shake.

- Mandeville, LA, USA

The contact owned a 2018 Hyundai Sonata. While the vehicle was stopped at a traffic light, the accelerator pedal was depressed; however, the vehicle failed to respond. On a second occasion, while exiting the driveway, the accelerator pedal was depressed to the floorboard, but the vehicle failed to exceed 2 mph. In addition, the check engine and tire pressure monitoring system warning indicators illuminated. The vehicle was taken to edmond Hyundai (located at 14137 N broadway ext, edmond, ok 73013, (405) 696-4950) where it was diagnosed that the fail had gone into limp or fail safe mode. The contact was also informed that an unknown cable was loose. The vehicle was not repaired. The manufacturer was notified. The contact traded in the vehicle. The approximate failure mileage was 4,000.

- Woodward, OK, USA

The contact owns a 2018 Hyundai Sonata. While driving 60 mph, the vehicle became sluggish, decelerated, and failed to accelerate above 40 mph. In addition, the check engine indicator illuminated. The vehicle was taken to napleton's valley Hyundai (4333 ogden ave, Aurora, il 60504, (630) 851-2500) where it was diagnosed that the wire harness needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and case number: 15704477 was provided. The failure mileage was 19,000. The VIN was not available.

- Bloomin Broke, IL, USA

I own this 2019 Sonata since 1/16/19. Was runing good at the first. But couple times start showing the engine light for seconds. But on April Sunday 14 2019 my car shows the engine light and the tire control stabilizer at the same time then the car start shaking lossing speed, the brakes getting hard and power steering.. lucky I went at 10mph to 15mph.the vehicle will be placed in a temporary engine protection mode with reduced power and acceleration. No speed no acceleration then I park in a parking lot for towing at the nearest Hyundai dealership. Technitia found code( P0638 ) active code and (P211935002A00 throttle body carbon cleaning- adjustment and found rubber grommet stuck in the throttle body roved grommet. This cause trouble with the intake and injectors making the car limp and state in protection mode. I have lucky I wasn't in the freeway at 55,60 to 65 mph. O can be a different risk and dangerous for me and others drivers. Please take this note seriously before something worse can happen to others drivers. Thank you so much.

- Waterbury, CT, USA

I have been notified my wife's car needs the Hyundai service campaign number 953 performed on her car. See below link. Https://autoservice.hyundaiusa.com/campaign953/micrositetemplate/micrositetemplatevinvalidate/3402 my concern is if this software update is performed on her car what will happen when this car goes into the safety mode" if this car slows down and reduces power with no warning what may happen? what if my wife is pulling out in traffic and the car goes into the engine safety mode with oncoming traffic? I fear once the car goes into the safety mode with reduce power and no adequate warning she me be hit by another vehicle. What measures has Hyundai taken to ensure a driver has adequate warning of the vehicle going into safe mode so they can get out of harms way of the flow of traffic to ensure they will not be hit before the vehicle goes into safe mode and reduces power" all I am trying to do is prevent a potential accident when this car goes into safe mode.

- Canton, GA, USA

The contact owned a 2018 Hyundai Sonata. While driving approximately 5 mph, the vehicle independently accelerated. The contact depressed the brake pedal, but it failed to slow down or stop the vehicle. The vehicle crashed into a palm tree. An incident report was filed, but not a police report due to the fact that there was no immediate injury. The contact suffered a sore neck and a possible whiplash. The vehicle was towed to an independent facility. Kearney mesa Hyundai (4797 convoy St, san diego, ca 92111, (858) 278-7100) was contacted and a voice message was left. The manufacturer was not contacted. The cause of the failure was not determined. The approximate failure mileage was 500. Consumer stated brake pedal was pushed multiple times and she did seek medical attention.

- Chula Vista, CA, USA

The contact owns a 2018 Hyundai Sonata. While driving at low speeds, the vehicle unintentionally accelerated and crashed into a pole. The air bags deployed. A police report was filed and there were no injuries. The vehicle was towed to carbone Honda bennington (751 N bennington rd, bennington, vt 05201, (802) 447-3321), but was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 8,800. Updated 11/30/18

- Benington, VT, USA

Purchased new 2018 Sonata sel model in California. While driving, the transmission starts to hard downshift when the brake is applied. I found out that this hard downshifting and jolting/thumping of engine and transmission only occurs when coming to a stop at speeds between 10 to 15mph. It can be described as follows, after the brake pedal has been gently applied and lightly released but then the car itself applied its brake again. It terrifies the driver's driving conditions, mentally and physically.

- Los Angeles, CA, USA