Tesla FSD Probe Expands To Millions Of Vehicles: Here’s What The NHTSA Is Investigating

The NHTSA probe includes the Model Y, 3, S, X, and the Cybertruck equipped with the company’s Full Self-Driving (FSD) technology.
Tesla Model Y, equipped with FSD system. View of FSD system in action with Tesla dashboard display. (Edie Leong for The Washington Post via Getty Images)
Tesla Model Y, equipped with FSD system. View of FSD system in action with Tesla dashboard display. (Edie Leong for The Washington Post via Getty Images)
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Rounak Jain·Stocktwits
Published Mar 19, 2026   |   6:39 AM EDT
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The U.S. National Highway Traffic Safety Administration (NHTSA) on Thursday elevated its probe into Tesla Inc.’s (TSLA) Full Self-Driving (FSD) technology over concerns that it fails to alert drivers about degraded visibility conditions.

The NHTSA probe covers more than 3.2 million Tesla vehicles and includes the Model Y, 3, S, X, and the Cybertruck equipped with the FSD technology.

“The focus of this investigation will be to assess the system’s ability, when encountering reduced roadway visibility conditions, to detect degradation and alert the driver with sufficient time to respond,” the NHTSA said.

Tesla’s shares declined about 0.3% in Thursday’s pre-market trade. Retail sentiment on Stocktwits around the company was in the ‘bearish’ territory at the time of writing.

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