I hadn't seen this posted previously that Tesla had instituted a MCU1 failure warning but first time driving after installing 20.40.9.2 on my '15 S I got the warning "Center display storage device degraded". I knew the MCU was going out but nice to see an "official" warning to trigger a service call presumably covered by the warranty adjustment program.
https://live.staticflickr.com/65535/50662462822_0a3c801e58_b.jpg
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More info here and on TMC if you search.
Hopefully, you will get the new chip you need, not a just a runaround or clearing the "home folder", another new term with uncertain meaning.
Suggest you get in the queue asap. I have been waiting 8 weeks ..
> This warning is very recent, maybe in the last two weeks. It may not appear for those on older firmware, prior to .40
>
> More info here and on TMC if you search.
OK, I suspected it had been posted before but buried in other threads. I stopped reading the mega-long MCU failure threads as they didn't seem to add any value other than complaining.
Bighorn
Posted November 28
Looks like diagnostics are becoming less opaque.
https://mobile.twitter.com/greentheonly/status/1332774137320837125
https://forums.tesla.com/discussion/179062/tesla-won-t-replace-emmc-chip
Looks like no road trips for us in LA for a while, and no need for AC if the MCU dies on the way to an essential destination.