Honda Accord 2013–2016 — technical service bulletin
Bulletin A16020C · NHTSA communication 10106675 · issued Feb 10, 2016
Technical service bulletin
communication type
Equipment
component
2013–2016
model years
4
vehicle entries
Official summary
"service news article - are you hearing a flapping or fluttering from the left rear of the vehicle when the vent position is set to floor/defrost, recirc is turned on, and the blower speed is set to at least three bars? This noise is coming from the fresh air vent that s behind the left corner of the rear bumper."
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.