TLDRs;
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NHTSA escalates Tesla FSD investigation citing multiple crashes in low-visibility conditions.
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Tesla developing updates but regulator unclear on deployment or affected vehicles.
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Crashes reveal FSD sometimes fails to detect obstacles and warn drivers in time.
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Stock slides as federal scrutiny raises questions about Tesla’s autonomous driving safety.
Tesla shares dipped on Friday as investors reacted to the U.S. government’s intensifying scrutiny of the company’s Full Self-Driving (Supervised) software, especially in low-visibility conditions.
The National Highway Traffic Safety Administration (NHTSA) has upgraded its ongoing investigation into the system, raising concerns about potential safety risks and regulatory actions that could impact Tesla’s operations and stock performance.
The escalation comes amid reports of multiple crashes linked to Tesla’s driver-assistance technology, including one that tragically resulted in a pedestrian fatality. Analysts say the news adds uncertainty for investors already monitoring Tesla’s ambitious push to launch robotaxi services in Austin, Texas.
Feds Raise Probe to Top Level
The National Highway Traffic Safety Administration’s Office of Defects Investigation (ODI) has elevated the probe into Tesla’s Full Self-Driving software to an “engineering analysis,” the highest level of review the agency conducts before potentially requiring a recall. The investigation initially began in October 2024, focusing on the software’s performance in low-visibility environments such as heavy rain, fog, or darkness.
This step indicates that federal regulators are seeking a deeper understanding of how Tesla’s system detects hazards and whether it reliably alerts drivers when its sensors fail to see objects on the road.
Multiple Incidents Trigger Concern
ODI’s review stems from at least four documented crashes in conditions where visibility was reduced. One of these incidents resulted in a pedestrian death, while additional cases identified by the agency show patterns where the Full Self-Driving system failed to detect vehicles or obstacles in time.
The regulator also noted that Tesla may have under-reported similar incidents due to limitations in its data collection and labeling processes, raising further questions about the system’s reliability in everyday driving situations.
Tesla’s Response Under Scrutiny
Tesla reportedly began developing an update to address low-visibility issues as early as June 2024, before the formal investigation was opened. However, ODI says the company has not fully disclosed whether the update has been deployed or which vehicles have received it.
In its assessment, ODI stated that in multiple crashes, the software either failed to detect deteriorated camera performance or did not provide timely warnings to drivers, leaving insufficient time for human intervention. These lapses have become central to regulators’ concerns as Tesla seeks to expand autonomous operations.
Broader Traffic Safety Concerns
The current investigation is just one of two ODI probes into Tesla’s Full Self-Driving software. The other focuses on more than 80 instances where the system allegedly violated basic traffic safety laws, including running red lights. Both investigations could have significant implications for Tesla’s broader plans, including its robotaxi program and the market perception of its autonomous driving technology.
Investors reacted quickly to the regulatory developments, with Tesla’s stock sliding amid uncertainty over potential recalls, software fixes, and the company’s ability to safely roll out autonomous services at scale. Analysts caution that ongoing federal scrutiny could weigh on Tesla’s near-term performance, even as the company continues to innovate in the EV and autonomous vehicle space.


