Knocking sound/feeling under left foot in drivers seat

[2012Sky]

I feel this every so often when going on a green light.
Almost as if when engaging a gear that's when I feel the thump. Sometimes it's very light other times it feels like someone kicking the bottom of the floorpan.

Anyone else experience this?

2012 3 Skyactiv with just over 900kms.

[2012Sky]

This is an Auto Tranny, used in auto and not manual mode.

[2012Sky]

Drove the car on my lunch to the mall.

When I come to a complete stop then hit the gas, that is when I feel the knocking under my foot.
Happened every time I stopped to go over a speed bump but the feeling was even before the front went over the bump.

On the way back stopped at a red, same thing on go.

Got to get a look under there to see what moving parts are right under the drivers floor pan.

[Woodman316]

It's a new car go to the dealer.

[5_Alive]

It's a new car go to the dealer.

+1.. Visit the dealer you purchased from or a closer dealership to where you are & have them take a look; its free of charge.

On the other hand, if you ran something over & it caused damage, this is an entirely different story.