Mazda CX-5 2017–2021 — technical service bulletin
Bulletin 09-028-21-3748a · NHTSA communication 10206007 · issued Dec 17, 2021
Technical service bulletin
communication type
Structure
component
2017–2021
model years
5
vehicle entries
Official summary
Whistling Noise From Front Door Window Glass or Windshield When Driving At Highway Speed: Some customers may complain about a whistling noise heard from the top of the A-pillar area and/or the top of windshield area when driving at highway speeds. When driving under the following conditions, a negative pressure is generated on the doors and the windshield 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.