Honda Accord 2018–2020 — technical service bulletin
Bulletin A19070D · NHTSA communication 10208840 · issued Mar 4, 2022
Technical service bulletin
communication type
Electrical System
component
2018–2020
model years
5
vehicle entries
Official summary
ServiceNews Article - Are you hearing a booming or rumbling through the speakers? If you get a vehicle in for this, remove the covers in the headliner for the ANC microphones and check if the insulating foam is damaged or folded over as shown below. We've found this may be the reason for the noise.
Vehicles covered
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.