2018 Hyundai Sonata engine complaints

Filed Jan 24, 2019 · Engine · 19,500 miles · NC

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??

Filed Jan 22, 2019 · Engine · 17,000 miles · TN

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.

Filed Jan 19, 2019 · Engine · 4,200 miles · NC

Dealer installed download #953 pursuant to a hyundai recall. Afterwards the car went into "limp" mode as if there was a problem, and cannot be driven. Dealer does not know how to fix this, and is holding my car and waiting for hyundai in california to come up with one. Mine was second car that morning that this happened to.

Filed Sep 9, 2018 · Acceleration, Engine · 1,100 miles · CA

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.