Bought the Accord Used in November 2017 with 33K miles (2016 model Touring) As another has mentioned the rear deck rattles when the subwoofer is on but also plastic rattles when the radio is off and just hitting normal bumps in the road. Very annoying. I just took it to Honda the 1st time and unfortunately couldn't duplicate the issue because it was 90 degrees and humid. It had been parked in their lot all day. I've noticed in that heat the plastic rattle that I hear sort of "goes away" in my mind the plastic has some what softened. But 1st thing in the morning when the weather is cool, back to rattling. I will be taking it back to Honda in a week or so once my new headlight (DRL issue again) is in stock.

I bought my 2016 Accord ex-l 2.4L I4 in October 2015. I love driving my car and also love listening to music while driving,

And the problem the audio system(sub woofer) started. When the music with strong bass is played, the subwoofer is vibrating and I guess the brake light that is mounted on the same part where the sub woofer is mounted is also vibrating and touching the rear windshield. It is making annoying vibrating noise. I just booked an appointment with my Honda dealer to get the issue fixed.

Please share if anyone has the same issue.

I will edit this post after the service appointment. Thanks.