Just bought a new 2016 Fit LX. I drove 130 miles to go get it, so here's how the story starts.

Bought the car and was on my way home. There was a lot of back road 55MPH driving and some thunderstorms. Anyways, after about 70 miles away from the dealership I got to a freeway. I was doing 75-80 MPH in ECON mode and then a very distinct, constant and loud knock from underneath started to occur. Freaked me out so I pulled over and tapped around on the big plastic piece underneath the car. Did not find anything loose. Since I had no check engine lights or any other indication I pushed on. Stayed at the speed limit of 70 and there is no noise. As soon as I crack 75MPH it starts to make the same sound.

Scheduled a visit to a dealership near me for tomorrow. But curious if anyone else had this issue and being curious George that I am I would really like to know what it is. Only logical thing I can think of is the high windspeed hitting that plastic shield and making it clank? Like I said I cant get the car to replicate the noise unless I get past 75MPH.

Also I noticed there is a little side to side wiggle room on my ebrake (side to side). Is that normal? Where the ebrake handle is, is where the car makes the sound.

 

Haven't heard any strange noises from under my car yet, but my parking brake handle has some side-to-side play in it as well.

 

Well, hoping its just the plastic piece underneath loose. Common sense points to that. I have read the Gas tank is under the Driver and Passenger Seats. Hope its not that!

 

I'll go with the loose splash shield for $500, Alex. Seriously, let us know the outcome.