NHTSA complaint #11723997

Owner complaint summary

While driving a flashing engine light came on in my 2019 Hyundai Tucson. This made the car slow down and have no power. I brought the car to the nearest mechanic, they told me it was the knock sensor and told me it was a recall for this car, I should bring it back to the dealership. I called the dealership and they had told me to bring the car in. They inspected the car on 8/30/24 at 44,990 miles and told me it was the knock sensor and replaced it. On 11/4/24 at 46,246 miles the car was brought back in for the same issue and the car was inspected again, it was the knock sensor. This time the software was replaced. On 1/29/25 at 48,042 while driving on a highway going 70 mph the flashing light comes on again, brought it back to the dealership and I was given a loaner. The reached out to me and told me it was the knock sensor. They had the car for about 5 days. On 2/14/25 at 48,248 again, driving on a highway the flashing engine light appears again. Called the dealership and brought in the car and again, the knock sensor. On 12/31/25 at 56,712, driving on the highway, the flashing light appears again...On 1/2/26 the car goes back to the dealership, they call me and said that it's the strangest thing, the serpentine belt is worn, and it was making a banging sound which was setting off the knock sensor. At this point they offered to put in a new serpentine belt. I refused because after 5 failed attempts, I decided to bring it to my mechanic (I had lost all confidence with Hyundai mechanics). He did replace it. At this point I sent a letter to Hyundai motors stating all the facts that have been happening and asked for a buyout. After their investigation they called me and said, because you brought it to your mechanic they couldn't help me, but, if it happens again, bring it back to Hyundai. On 2/2/26, 57,286, again. I called the dealership and brought it back. This time they said that they didn't have a loaner to give so I rented one, 4 days. This is 5 failed attempts