Mazda MAZDA3 2019–2023 — technical service bulletin
Bulletin 09-040-25 · NHTSA communication 11024991 · issued Oct 24, 2025
Technical service bulletin
communication type
Electrical System
component
2019–2023
model years
5
vehicle entries
Official summary
Some customers may experience rear subwoofer audio sound pauses intermittently at high volume levels. When the volume level is lowered, the subwoofer audio sound resumes. The actual volume level may vary depending on the audio source. If the audio source consists of many low frequency (40 - 70 Hz) sounds, the concern may occur at volume level 35 or higher. This concern may be caused by improper audio amplifier control software. To eliminate this concern, the control software has been modified.
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.