Mazda CX-5 2017–2021 — technical service bulletin
Bulletin 09-028-21-3748 · NHTSA communication 10201775 · issued Sep 17, 2021
Technical service bulletin
communication type
Structure
component
2017–2021
model years
5
vehicle entries
Official summary
Some customers may complain about a whistling noise heard from the top of the A-pillar area when driving at highway speeds. When driving under following conditions, a negative pressure is generated on the doors pulling them outward and resulting in weatherstrip vibration. The vehicle is exposed to a side wind while driving at highway speeds. The vehicle is exposed to a strong side wind while driving at a speed slightly higher than highway speed.
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.