I have the 2015 Corolla S Plus and I have the same problem. When I am driving above 40mph, I hear some rattling from the dashboard on the drivers side, I cant seem to figure it out. It is VERYYYYYYYYY annoying, what could it be?
I take some of the stuff we put in the cubby areas back out, see if that helps. I put something in a top cubby area and boy did that noise travel months later, Hey I found it the noise issue