Had a SA today. They claim they heard it and it was “Isolated noise coming from the super manifold pumping and coolant pumps pumping coolant through the vehicle thermal system. Performed system thermal test (passed), and also performed a coolant air purge. System is operating as intended at this time.”
I am on 28.2 and have the the high pitched noise. It appeared around Sept 1st, 2022. The sound is coming from under the rear wheels…seems to be getting louder by the day. Loud when parked. Doesn’t matter if it was recently driven. No correlation with driving. I have a 2022 Model S running 28.2. My best estimate is that this started with the 28.1 update. I have 3,800 miles on my S. Appointment with Tesla service next week. Hope this gets fixed!
I’m on 24.8 and my car started doing this exact thing today.
Contactors are relays, that is, electrically-controlled switches. They make the loud "clunk" sound when the car turns on or off. I don't understand how the car could work at all if those were oscillating at 2KHz.
apparently so... relays use a coil to throw the contactor into position essentially similar to a transformer coil and how it can make humming sounds depending on the frequency and voltage of the signal driving it. I'm guessing they use PWM to modulate the input signal to throw the switch and somehow it's not stable in this configuration or at the voltage and frequency they are using to modulate it... maybe some clever engineer trying to save a little power by reducing it's duty cycle or something, just a guess based on developing embedded systems and firmware for a living. could be way off base but that's my take on what's wrong based on what he told me.
I think that's exactly right. My guess is they've been doing this for a long time, and are now just tweaking the frequency to the lowest possible that keeps the contacts firmly closed, but got to a place where they may have set up some sympathetic resonance in some part in or around the contactor that the part tolerances in the field allowed, but in the lab / test cars did not.
yep, welcome to the club... just installed the latest update 38.2 and it might have fixed it but need more time to tell for sure.
FYI: Tesla service was not able to remotely diagnose the problem with autopilot. I had to bring it in. They replaced the computer. They said that updating the software cause the memory to go bad. He said that this were a problem with the older computers.
