Clunk every once in a while, but i have a whining noise, high pitch. It has always been there. Was told by service that all tesla's do this. Like a whistle at times. I thinks it is the sound generator to let people know I'm there. I have brought it up several times but it's still going. 18k since I bought it 35k now. First quarter 2013. I guess I am the Whiner.