Safety experts ask Tesla to recall hundreds of thousands of electric vehicles: what is the reason

US safety regulators have asked Tesla to recall 158 vehicles due to multimedia control unit failures that have caused touchscreen displays to stop working. The investigation was carried out by the National Highway Traffic Safety Administration, writes Tech Crunch.

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A division of the agency has determined that the failure of the multimedia control unit is a safety issue, as functions such as a backup camera and controls for anti-fog and anti-icing systems, as well as audible alarms that are used when the turn signal is turned on and warn drivers when activated autopilot. Reports of sudden microcontroller failure have been a topic of discussion on Tesla forums for years.

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According to the researchers, the failure occurs when the memory on the flash drive used in these cars reaches its maximum capacity. The only solution is to replace the physical hardware. Affected vehicles include Model S sedans produced between 2012 and 2018, and Model X SUVs produced between 2016 and 2018.

Tesla did not respond to a request for comment. However, the company has confirmed to NHTSA that, given the limited memory capacity, all devices will inevitably fail. Tesla has unveiled its own statistical model showing the number of scheduled weekly microcontroller repairs from 2020 to 2028. The automaker estimates that replacement rates for failed microcontrollers will peak in early 2022 and gradually decline until (nearly) full turnover is achieved in 2028.

These vehicles are equipped with an Nvidia Tegra 3 processor with an onboard 8GB eMMC NAND flash device. A portion of this 8 GB is used every time the vehicle is started. Hardware breaks down when the storage capacity is reached, causing microcontrollers to fail, the agency said.

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The lifespan of an eMMC NAND flash device depends on the number of program/erase cycles after which the MCU fails due to memory wear. The researchers determined that the expected lifespan of an 8GB device is about 3000 cycles before the device stops working—this could happen in as little as 5 to 6 years.

The agency has formally required Tesla to initiate a recall and notify all owners, buyers and dealers of the vehicles in question about this safety defect, providing them with a remedy.

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