US safety regulators have asked Tesla to recall 158,000 vehicles due to media control unit failures that stop working touchscreen displays after a month-long investigation by the National Highway Traffic Safety Administration.
The agency’s defect investigation office determined that the failure of the media control unit is a security issue as audio shutdowns such as backup cameras and defogging and defrosting settings cease to function, using a turnover indicator Is done while doing. Is activated and to alert drivers while the vehicle’s autopilot is equipped with an advanced driver assistance system. Reports of MCUs in Tesla forums have suddenly failed.
The failure occurs when the flash drive used in these vehicles reaches memory storage capacity, investigators concluded. The only solution is to replace the physical piece of hardware. Affected vehicles include the Model S sedan manufactured between 2012 and 2018 as well as the Model X SUV in 2016 through 2018.
Tesla did not respond to a request for comment. However, the company provided information to NHTSA, which is contained in the report. Tesla confirmed to NHTSA that all units will inevitably fail, given the finite storage capacity of the memory device. Tesla provided its own statistical model showing the estimated number of weekly MCU repairs from 2020 to 2028. The automaker anticipated that the replacement rate for MCU failures would peak as early as 2022 and gradually decrease (almost) full part turnover is completed in 2028, according to the report accordingly.
These vehicles are equipped with an NVIDIA Tegra 3 processor with an 8GB eMMC NAND flash memory device. A portion of this 8GB storage capacity is used every time the vehicle is turned on. The agency stated that EMMC fails to reach NAND cell hardware storage capacity, resulting in MCU failure.
The EMMC NAND flash is based on the life span of the device based on the number of program / erase cycles, after which the MCU fails due to memory wear-out. Investigators determined that the expected usage life rating for an 8GB eMMC NAND flash memory device is approximately 3,000 program-erase cycles, after which the eMMC NAND flash memory device will be fully consumed and no longer powered on. The agency stated that at a daily cycle utilization rate of 1.4 per block, the accumulation of 3,000 P / E cycles would take only 5 to 6 years.
The agency has officially requested that Tesla initiate a recall and provide a remedy to notify all owners, buyers and dealers of vehicles subject to this safety defect.