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Ultra low frequency sound when putting Model S in reverse

ToddRLockwood

Active Member
Sep 11, 2012
1,317
74
Burlington, Vermont
At first I thought it was a National Guard helicopter approaching. I had just climbed into my Model S, had my foot on the brake (with Creep turned on). I put the car into reverse and began to hear/feel a very low frequency sound ~50Hz. As I backed out of the garage, the sound gradually faded away. Total duration was maybe 5 seconds. It just happened again in a parking lot. Curious. I'm trying to imagine what could cause it. My best guess: the motor (while in reverse and in Creep mode) is temporarily caught in a kind of pulsing feedback loop until the brakes are fully released.

Has anyone else experienced this? Not a big deal. I'm just curious.

When it first happened, I quickly turned off the audio system, and the sound continued.
 
Last edited:

EarlyAdopter

Active Member
Jun 24, 2012
2,818
2,048
Redmond, WA
Is it warm there for the first time since you got the car? The sound you describe sounds like the AC compressor when it first starts up.

If you hear it again you can confirm by quickly turning off the climate control and seeing if the sound goes away.
 

mknox

Well-Known Member
Aug 7, 2012
10,103
1,867
Toronto, ON
I have also experienced this and I agree with your analysis, i.e., creep and brakes kind of oscillate back and forth.

Should be easy enough to confirm. Try it with Creep off and see if the sound goes away. (I used Creep for a while, and never noticed this).
 

FlasherZ

Sig Model S + Sig Model X + Model 3 Resv
Jun 21, 2012
7,024
1,013
I've heard this noise and it goes away if you turn off climate control.
 

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