[ChrisH09]

Your car does give off road noise...the TP2 is probably picking that up....also you have to remember this phone has 2 mic's...so it will pick up 2x as much as a phone with only one. Your phone is not defective....I have the same thing happen to me when I'm driving down the road....window up or down....the Mic is just that sensitive...could be a bad thing or a good thing....

I would recommend calling up HTC..... 866-449-8358 and asking them about it...they may have a solution to your issue...dont bother calling Sprint, since the will most likly send you from department to department and give you the same answer you heard 2 departments before....Yes...I've had the deal with those idiots they call Tech Support...