Check Engine Light On problems of the 2018 Hyundai Sonata

I was driving my car at about 45mph on my way to work on a highway road and out of no where it jerked and the check engine light started flashing. Car would not accelerate above 2,000 rpms. When the car jerked, it was so sudden it injured my lower back. My back has been very sore since this incident. I then took to dealer and they said it was a known issue and Hyundai had not recalled my specific car. Dealer was able to replicate the issue. The cleared the check engine light and sent me on my way. One mile down the road exact same thing happened. Car is currently at their shop with no eta of repair.

My daughter was driving on the highway when the car started to buck and wouldn't accelerate. The check engine light came on and she pulled off the highway. She called Hyundai and they told her not to drive the car and to have it towed to a dealership. We were then told by Hyundai that this is a known problem. They installed a knock sensor wiring harness and said they hope that does the trick but it could need a whole new engine. Expected repair time is 6 weeks since parts are on backorder. We have since spoken to several dealerships as well as consumers and there are so many complaints that some people have been without their cars for months.

Tl the contact owns a 2018 Hyundai Sonata. The contact stated that the vehicle was taken to Hyundai of kirkland dealer (11706 124th Ave ne, kirkland, wa 98034, (425) 821-6611) where a software update was completed. The contact stated that when leaving the dealer while driving at 40 mph, the vehicle stalled as the check engine warning light and engine control system failure detected illuminated. The contact stated that the vehicle speed automatically decreased to 10 mph. The contact stated they slowly drove back to the dealer, where it was determined that a new engine was needed. However, a week later he was informed by the dealer that the wire harness had failed and needed to be replaced. The vehicle was repaired. The contact stated spoken to the manufacturer via email and was provided a case number: 15658545. The approximate failure mileage was 3,713.

While driving my vehicle at nearly 70 mph on the freeway, my car suddenly felt like I hit a brick wall and my check engine light came on and began flashing. I was then unable to accelarate past 55 and felt my car had a very sluggish response when stepping on the gas pedal. I was nearly hit by another car because there was no warning (break lights) when my car immediately slowed down. I then had to have my car towed 50 miles from where I was to the dealership near my home. When I brought in my car they said they had another car with the same exact issue. I called after my car had been there for approximately three days to get a status update and they said they still didn't know what was causing the issue, but that a third vehicle had now been brought in for the same issue. Today a week later, I called to get an update and the other two vehicles they are fixing with a new wiring harness; however mine they stilll are unsure what the issue is. This is now the third issue I've had with my car in less than 13,000 miles. Previously my car was having trouble starting the dealer said everything was fine. Also my front running light burned out at nearly 7k miles.

Had oil changed on 1/24/2019, they did the ecm update for the knocks senser and afterwards on the way home the car went into limp mode and check engine light came on. I also received an email from Hyundai blue link saying that an engine component had failed. Took back to dealership and they gave me a loaner. They said they would have to hear back from Hyundai in CA?? sounds like nobody knows what is going on??.

I had an oil change on Friday 1/18/2019 the next day I'm driving on the interstate using cruise control and my car cut my cruise control off and the check engine light started flashing and my car would not go over 20mph even with the pedal all the way down to the floor. The screen in my car popped up a message that said the engine control system had some type of failure. 2 days in at the dealership and no one knows what the problem is. It's not even a year old, idles fairly hard, and now won't accelerate.