When your 2022 Mazda CX-5 produces a buzzing noise during acceleration, something is vibrating or resonating at frequencies specific to acceleration RPM or load. Buzzing sounds are typically sympathetic vibrations rather than mechanical failures.
Exhaust Heat Shield Resonance
Heat shields on the exhaust system can develop loose spots or rust that allow them to buzz at certain frequencies. This buzzing often occurs at specific RPM ranges during acceleration and may disappear above or below those RPMs. The shields vibrate sympathetically with exhaust pulses.
Exhaust System Harmonic
The exhaust system itself can create buzzing at certain engine speeds as exhaust pulses hit resonant frequencies of system components. This isn't necessarily a failure - some vehicles have characteristic sounds at specific RPM ranges.
Interior Panel Vibration
Dashboard components, door panels, or interior trim can buzz at acceleration frequencies. These sounds seem like they're from the engine because they correlate with throttle input, but they're actually interior panels vibrating sympathetically. Try pressing on various panels while driving to locate the source.
Engine Cover or Components
The plastic engine cover, air intake components, or other underhood plastic can buzz when loose or when their mounting breaks down. These covers are designed to fit snugly; any looseness allows vibration that creates buzzing.
Accessory Drive
Belt-driven accessories can create buzzing sounds at certain RPM ranges if bearings are worn, belts are loose, or pulley alignment is off. This buzzing typically tracks with RPM rather than vehicle speed.
Locating the Buzz
Have a passenger help by listening and pressing on panels while you maintain steady throttle at the buzzing RPM. If you can reproduce the RPM while stationary (in Park), safely explore the engine bay while an assistant holds steady throttle to pinpoint external sources.