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Weird Sound coming from MCU

mbhforum

Active Member
Apr 4, 2016
1,223
627
Long Island, NY
I’ve had my 2015 S for a little over a year now and this is the first time I experienced this....I got into my car after lunch and heard a really weird sound that sounded like a bad fan while I was driving. I turned off my climate control and it remained...I happened to be close to my Tesla Service center so I called them to see if I can swing by and when I was on the call via Bluetooth, the sound disappeared. Tesla told me to reboot the MCU as they’ve seen this issue before and sure enough that fixed it. Obviously software related.

Anyone else ever have this happen? My wife claimed it happened once when she was driving. (Of course I hear about it now!)
 

RDuke

Member
Jan 11, 2015
70
11
St. Petersburg, FL
I wish I took a video of it but I was driving. It sounded like a broken fan at High speed....
I had exactly the same experience yesterday for the first time in my 2015 S. Sounded like the fan in the MCU was over-revving.

Resetting the MCU cured it, at least for the time being. I have a 10 second video clip, but can't figure out how to upload it here to TMC.
 

scaesare

Well-Known Member
Mar 14, 2013
8,446
14,277
NoVA
The MCU does have fans... and I assume they are under machine control for variable speed... sounds like the MCU got confused.
 

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