NHTSA complaint #11528750

Owner complaint summary

On May 12 2023 I was driving my vehicle and heard a knocking sound that was unfamiliar. I pulled over and opened my hood and could hear the engine making a continuous knocking noise. I got back into my vehicle to take it to the closest mechanic and the vehicle failed after I had went barely a quarter of a mile. It took Hyundai almost 2.5 weeks to get an appointment with them and another week to have the car diagnosed. The service department called me and said the engine was bad and needed to be replaced. The car engine was still under warranty so my main concern was how long I had been without my vehicle and the rental car costs I was incurring. My vehicle was finally ready and fixed according to the service department. I went picked up my vehicle and started to drive home. As soon as I started to accelerate I noticed the car seemed to be delayed or was having difficulty accelerating. The ac also started hissing and blowing out hot air. I took the car back to the service department and had to wait another week. Finally get a call from Hyundai saying no issues were found and it passed all the tests. I go pick up the car and less then 24 hours later the car acceleration seems to be struggling and the car is having difficulty going past 50 mph. So now I’m back at square one taking my car that Hyundai says is fine back to Hyundai.