I took the car to the SC yesterday and they kept it for a day and perform thermal test, all normal. They are blaming the hot weather in Texas which is questionable as it has been parked overnight. In my case, once I ope the door, wait for the AC to kicks in, and then close the door, the humming noise stops, you can try on yours and see if it works for you. I am going to replace the 12V battery myself this weekend to see if it eliminates the noiseHi,
Has replacing 12v battery helped in your case? I'm in same boat as you. No 12V messages yet, but car has been running water pumps at 100% 24x7. SC replaced one of pumps already and they blame hot weather in UK! I have scan my Tesla app and pack temperature is at 34C while I'm writing this post at 4am with outside temp of 19C. It stopped charging at 90% few hours ago and car was stationary since 10.30pm. Will check pack temperature at 6am...