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It appears as though the issue is contained within the rear drive unit. To determine this, the vehicle was lifted on an alignment platform and power braked to identify the source of the noise. The source strongly appeared to be generated from within the drive unit. Has someone heard this...

I changed the tires yesterday morning to no effect or reduction in the noise. Upon changing the upper rear left control arm that definitely had a worn out bushing, the clunk is still there. Due to a combination of how the issues present and behave, my best guess is that the clunk and...

Update: Upon some more driving, I believe this is an additional symptom of the worn bushing on the control arm I mentioned. When regen braking, the noise is not there until the "clunk" is heard, then the noise is there, as if the whirring is the individual poles in the motor resonating through...

I have been recently having a whirring noise on regen braking on my 2015 Model S 85D. This noise only occurs when slowing down with regenerative braking and the noise disappears when braking or rolling in neutral or while accelerating/maintaining speed. Here is a link to a recording of the...