I think my 2016 Tesla Model X 90D has the dreaded MCU failure. The car is at 56K miles and firmware version 2020.36.3.1
The first time it happens was on 7/24. When I returned to my car, the touch screen is blank. I tried the two scrolling wheels to reboot. same blank screen. The dash monitor shows "Please wait while vehicle systems power up". I left the car and return the next day and the car is fine now. I thought that is over.
But on 10/11, while driving, I noticed that the navigation is not responding and tried the 2 scrolling wheels to reboot the system. I got a blank touch screen. The screen did not come back until 1 hour later. on 10/12, I took it to the service center and the rep told me that is a results of 4 years of navigation history in the memory. He offered 5 solutions
1: manually delete the entried in the navigation bar (It did not work as I found later)
2: they erase the entried in the store, $156
3: they replace the memory module, $400
4: they replace the MCU, $1300
5: they replace the MCU with MCU2 and touch screen, $2500. but the AM&FM&XM are gone.
I chose the option 1 and deleted more than 200 addresses manually. but on 10/19 I noticed the loss of LTE/WiFi connection to the car. Later when I reboot, the same touch screen blank returned. about 1 hour later, the screen came back and I noticed that the deleted address showed up on the navigation search menu. So option 1 totally did not work.
Finally, I did my home work and found this link https://teslatap.com/articles/mcu1-flash-memory-analysis-and-failures/ and the forum discussion. It looks like I have a bad eMMC chip and need the option 3. Do I need to replace MCU ?