I have 2016. Tucson 1.6T 4wd. A few days ago, I was driving on highway at about 135 km/h (cruise control was on). Suddenly, I noticed noise from back end of the car. It increased rapidly and after 3-4 seconds whole car was in strong vibrations and noise. Steering wheel vibrated strong and whole car. I applied brakes and also brake pedal vibrated (ABS was not engaged). Vibrations didn't disappear until I stopped a car after probably 300 meters. I parked on the grass by the way. Checked wheels bolts. They were tightened properly but I added a few more tork to left front wheel. It seemed that problem was solved. I drove about 20km on the same speed and nothing happened.
But today I was on the highway again. After 3-4 minutes at 135km/h (again cruise was on), the same happened. Again I stopped the car. I got out but nothing was weird. Everything seemed to be okay. Again, noise and vibrations didn't disappear until I stopped the car completely. After that, I drove 25km back to home but not faster than 70km/h and car worked fine.
Does anybody have any idea what can cause the problems? I checked wheel rims and all balancing weights are on place. Everything looks perfect visually. The only suspicious thing is noise from brake calipers when I drive on bad roads.
I called the dealer and they say that they can not accept the car before Monday. Then we will have test drive.
But I will be happy to have any tip from other Tucson drivers. My car has 20.000km and I drive very carefully. It is almost new. But unfortunately my satisfaction with Tucson decreases with every day
During these 20.000km, I had problem with TPMS (sensor replaced), with seat cover (replaced), with water in tail light (replaced) and with parking brake (adjusted something ...). Too many problems
Sorry for my bad English, and thanks for help