Model S/X MCU1 (Tegra): eMMC wear — prevention and recovery

Symptoms

• Freezes, reboots, black screen, loss of rear camera/HVAC controls/turn signals on screen.

What to do

• Preventively replace the eMMC with 64–128 GB at a specialized service.
• Or officially — via the campaign/improved board (MCU repair).

Price in Belarus

≈ $250–600 for chip replacement with data transfer.

Links

• Tesla eMMC FAQ: https://www.tesla.com/support/8gb-emmc-recall-frequently-asked-questions
• NHTSA recall documents 21V035: https://static.nhtsa.gov/odi/rcl/2021/RCRIT-21V035-9972.pdf , https://static.nhtsa.gov/odi/rcl/2021/RCLRPT-21V035-4682.PDF
• MCU1 problem explanation: https://www.findmyelectric.com/blog/tesla-mcu1-emmc-failure-explained/

Community experience TESLA Belarus

Analysis of 400,000 messages from the TESLA owner's group BELARUS chat — relevant for early Model 3 and Model S/X with MCU1.

Solution options from chat (with Belarus nuances):

1. MCU from a donor (~$1000 + labor). Downside: a different VIN displayed on screen, may be cross-checked at inspection and at the border.
2. Resoldering the eMMC chip — cheaper, but you need a specialist with the equipment.
3. In Poland — more expensive, but with the original VIN preserved.
4. After MCU replacement, updates may not arrive if VIN doesn't match.

Who reported the issue: AA, alex

Who found the fix: Иван, Alex Bor, Dr. Pilulkin, Андрей Ковалёв

Discussion in Telegram: #214855, #214858

Additional sources:

• Consolidated eMMC Thread — MCU repair (Tesla Motors Club): https://teslamotorsclub.com/tmc/threads/consolidated-emmc-thread-mcu-repair-black-center-screen.181124/