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Tesla Phantom Brake Investigation — 416,000 Cars Participated


  • This week, the National Highway Traffic Safety Administration announced that it has opened an investigation into more than 400,000 Teslas — all 2021 and 2022 model years. Tesla Model 3 and Model Y electric vehicles — for problems with their automatic emergency braking system.
  • This isn’t the first time Tesla has had to deal with NHTSA over potentially faulty AEB technology. In October, Tesla remember its nearly 12,000 EVs due to an over-the-air update caused communication problems between the two chips that help run the AEB system.
  • Other automakers, including Nissan and the shuttle company EasyMile, have also had problems with their AEB systems.

    New technology can lead to new problems, for which we sometimes have to invent new terms. In the automotive world, the increasing number of cars with automatic emergency braking has led to something called “virtual braking”, which is when the AEB system thinks it needs to brake to prevent a collision, but actually nothing to hit. .

    This week, the National Highway Traffic Safety Administration (NHTSA) said it received 354 complaints from Tesla drivers related to these unexpected automatic braking incidents over the past nine months. NHTSA says that Tesla drivers have reported “that rapid deceleration can occur without warning, randomly, and often repeat within a driving cycle.”

    The issue is likely to affect approximately 416,000 vehicles, all Tesla Model 3 and Model Y electric vehicles in 2021 and 2022, and the rise in complaints widely follows Tesla’s move from a multisensory perception system convert using both radar and camera to the new Tesla Vision system. just rely on the camera. As of May 2021, Tesla has not installed radar sensors on Model 3 and Model Y vehicles manufactured for the North American market. Tesla CEO Elon Musk remains in favor of the camera-only system, tweeting last December that “While radar has trouble seeing small pedestrians, they are evident with Tesla Vision.” NHTSA’s Office of Fault Investigation has opened a Preliminary Review of the matter and said it is not aware of any incidents or injuries related to the issue.

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    This isn’t the first time NHTSA has looked into Tesla’s virtual braking problem. Last October, NHTSA announced that Tesla would recall some 2017–2021 Model S, Model 3, Model X and 2020–2021 Model Y vehicles (11,728 total) because “a communication error may cause false forward collision warning (FCW) or brake activation. unexpected automatic emergency (AEB) system.”

    NHTSA said at the time that the problem was caused by an over-the-air software update that caused communication problems between the two integrated chips when the vehicle exited Sentry or Summon Standby mode. NHTSA says that at this point, one of the chips may remain in a low-power “sleep” state, with the consequence that the video neural networks operating on one of the chips will not communicate correctly with each other. the other chip and then. “runs less consistently than expected.” When this happens, an affected vehicle can incorrectly identify objects around it, and this happens enough times that early Tesla drivers report a dramatic increase in the number of problems. problems with forward collision warning and AEB events. Tesla told NHTSA it resolved the issue with a follow-up OTA update.

    Tesla isn’t the only automaker facing questions about virtual braking. In 2020, self-propelled shuttle operator EasyMile was forced to halt operations when one of its vehicles injured a passenger during an abrupt stop. In 2019, NHTSA looked into virtual brake problems in 2017–2018 Nissan Rogue SUVs following complaints from drivers. NHTSA announced at the end of 2020 that it has works with 20 car manufacturers on a voluntary basis to bring forward collision warning and low-speed AEB as standard on “almost all new passenger vehicles” by August 31, 2023.

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