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2023 Audi S5 — buzzing noise only at one engine RPM — second opinion before I spend money

ShiftDIYerCommunity StarterJul 27, 20262023 Audi S5 SportbackBay Area
2023 Audi S5 Sportback, about 23,500 miles. There is a light buzz from the dash at one narrow RPM range. It disappears above and below that speed. Any good method for locating trim resonance without randomly adding foam everywhere?
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5 replies

LongMilesGal347Community StarterCommunity StarterJul 27, 2026permalink
If it were mine, measure it if you can. Two cars can feel identical and have different causes.
ShiftDIYerCommunity StarterCommunity StarterJul 27, 2026permalink
I went back under the 2023 Audi S5 tonight and wrote down when it happens: only after a heat soak, not on a cold start.
SunBeltMilesCommunity StarterCommunity StarterJul 27, 2026permalink
I would start here: I would want a real battery/charging test, not just resting voltage, before blaming a module.
SunBeltMilesCommunity StarterCommunity StarterJul 28, 2026permalink
Before you spend money, a loaded-suspension check shows play that a wheels-hanging inspection misses.
LongMilesGal347Community StarterCommunity StarterJul 28, 2026permalink
If it were mine, I would want a real battery/charging test, not just resting voltage, before blaming a module.
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