I Have a 2012 Honda Accord EX-L V6 with 850 miles and the driver's side window makes a slight click when it closes all the way and seats into the weather stripping. The passenger side window is fine. I compared the two windows and found that there is more play in the driver's side window, up and down & side to side, than the passenger side window. Other than the slight click, the window operates fine.

Is it possible that the regulator could be slightly loose, or is this just a slight difference when it was manufactured?

Thank you for your help

 

Since the car is new and is under warranty, I would take it back to the dealer and have them deal with it. It could be something as simple as a loose bolt(s) on the motor/regulator or the bolts that hold on the window.

 

I agree with PA ,, don't try to fix or mess with ANYTHING while car is under warranty or dealer could void warranty