I have a 09 Sonata with 111,000 miles on it. I have followed the maint. schedule to a tee. When you are crusing at about 35mph at about 1500rpm it gets a vibration (feels drive train, nothing in the steering or wheels) that is a lot like your driving on the center line turtles. As soon as you get past about 1600 rpm it goes away. It will not do it sitting still. That leads me to drive train? Wondering if anyone has run across anything like this? I'm about to pull out what little hair I have left!

 

It could possibly be a torque convertor, do you have any codes or a CEL?

 

I have been getting interment "EVAP system,large leak" codes with a check engine light. I had it at a shop last Friday and he put a smoke machine on it and said there was not a EVAP leak that was showing up.

 

It sounds like you may need to take it to someone who specializes in Hyundai's. There is obviously something wrong and without a code number I cannot provide much of a suggestion. I wish I could help more, if you get a code number let me know.

 

Wholesalehyundaiparts, you nailed it it's the torque converter. Now I'm trying to decide used with 64,000 miles & a 12,000 mile 12 month warranty or rebuild mine. Thanks for the help!!!