I have a 2009 Sonata GLS with about 45,000 miles on it. Lately when I am driving over 50mph it has been making a very annoying, high pitched humming noise. The noise seems to pulsate on and off. If I am going in a straight line, the noise is present, pulsing steadily. If I turn right, the noise speeds up and gets louder. If I turn left, the noise slows down or goes away completely. The noise is not super loud yet, but it is driving me crazy.
I took it into the dealership and they said it was a tire problem - one is worn more than the others (though not so much that it needs to be replaced yet)
From what I have been reading online, it sounds to me like it's a wheel bearing problem, and possibly the worn tire is a symptom of that problem. However I have also read that the average wheel bearing should last about 100,000 miles with proper maintenance. If it is a wheel bearing, it should be covered under warranty, shouldn't it?
What does everyone think the issue is?