Senators Demand NHTSA Investigate Tesla Self-Driving Safety Claims by July 7

Two United States senators have told federal safety regulators to stop deferring to Tesla and start independently testing the company’s claims about how safe its self-driving software really is. In a letter dated June 16, 2026, Senators Edward Markey of Massachusetts and Richard Blumenthal of Connecticut wrote to National Highway Traffic Safety Administration Administrator Jonathan Morrison, demanding a full investigation into Tesla’s Full Self-Driving system and giving the agency until July 7, 2026 to respond. For the millions of Americans who share the road with Teslas every day, the dispute is about a simple question: are the safety numbers Tesla advertises actually true?

The letter lands on top of a longer-running federal probe into Tesla’s driver-assistance technology and adds political pressure at a moment when the company is pushing its automated driving features harder than ever. Here is what the senators are asking, what regulators are already examining, and what it means if you own a Tesla or drive near one.

What the Senators Are Demanding

The core of the Markey and Blumenthal letter is a challenge to Tesla’s marketing math. The company has publicly claimed that Full Self-Driving is several times safer than a human driver, with figures suggesting it is seven or even ten times safer. The senators want to know whether NHTSA has ever independently checked those claims for statistical validity or methodological soundness, or whether the agency has simply accepted numbers produced and published by Tesla itself.

Their concern is that safety claims drawn from a company’s own data can be shaped by how the data is collected and counted. If a system disengages a fraction of a second before an impact, for instance, the question of whether that counts as a system failure depends entirely on the methodology. The lawmakers argue that a federal regulator, not the manufacturer, should be the one validating whether automated driving is as safe as advertised, and they set July 7, 2026 as the deadline for the agency to answer a series of detailed questions.

This is not the first time the two senators have pressed the agency on Tesla. Markey and Blumenthal have repeatedly called for greater transparency from Tesla and other companies developing automated vehicles, arguing that the public has a right to understand how the systems sharing the roads actually perform. Their latest letter frames the issue as one of accountability: a company should not be able to advertise a safety record that no independent body has checked. The senators are effectively asking the regulator to show its work, and to make Tesla show its own.

The comparison drivers should keep in mind is how safety claims are normally verified elsewhere in the auto industry. Crash-test ratings, for example, come from controlled, repeatable tests run by the government and by independent insurers, not from figures a manufacturer chooses to release. The senators’ argument is that automated-driving safety deserves the same independent scrutiny, particularly because the technology is improving and spreading faster than the rules written to govern it.

The Investigations Already Underway

The new letter does not exist in isolation. NHTSA has been scrutinizing Tesla’s automated systems on several fronts. One long-standing line of inquiry concerns “phantom braking,” the term owners use when a car slows or brakes hard for no obvious reason while driver-assistance is engaged. That examination has centered on 2021 and 2022 Model 3 and Model Y vehicles, with hundreds of complaints on file and roughly 416,000 cars falling within the scope of the agency’s review. Drivers have described sudden, violent deceleration on open highways, the kind of event that can catch following traffic off guard.

Separately, the agency has opened an investigation into Tesla’s Full Self-Driving system itself after earlier pressure from the same senators, looking at how the software behaves in real-world conditions. Phantom braking and the broader Full Self-Driving probe are distinct issues, but together they show a regulator working through a backlog of questions about how Tesla’s cameras-only approach to automated driving performs when shadows, overpasses, low sun or unusual road markings confuse the system. The June 16 letter is an attempt by lawmakers to make sure that work is thorough and independent rather than deferential.

Why This Affects Every Driver, Not Just Tesla Owners

Automated driving features are no longer a niche curiosity. Tesla sells some of the most popular vehicles in the country, and its driver-assistance software is active on highways and city streets nationwide. When one of those cars brakes unexpectedly or misjudges a maneuver, the consequences are shared by everyone around it: the driver behind who has to stop in time, the family in the next lane, the cyclist at the intersection. That is why federal safety standards treat advanced driver assistance as a public safety matter, not just a question for the people who bought the car.

The outcome of these reviews could shape how automated driving is regulated across the whole industry. If NHTSA decides that company-reported safety statistics need independent verification, every automaker selling driver-assistance technology could face tougher disclosure rules. If the agency orders changes to how Tesla’s systems operate, those could arrive as over-the-air software updates that reach hundreds of thousands of cars at once. Either way, the standards being argued over now will influence the cars sharing your commute for years.

It is worth being precise about what these features are and are not. Tesla’s Autopilot and Full Self-Driving are classified as driver-assistance systems, which means a licensed human driver remains legally responsible for the vehicle at all times. Despite the names, neither system makes a Tesla a self-driving car in the everyday sense, and the company’s own documentation tells owners to stay ready to intervene. That gap between branding and capability is part of what the senators are probing, because a driver who over-trusts the system based on its name or its advertised safety record may be slower to react when it makes a mistake.

What To Do if You Drive or Share the Road With a Tesla

If you own a Tesla, the most important habit is to treat Autopilot and Full Self-Driving as assistance, not autonomy. Both systems require an attentive driver ready to take over instantly, and keeping your hands on the wheel and eyes on the road is the single best protection against an unexpected braking event or a missed hazard. Make sure your car’s cameras are clean, since the system relies entirely on vision, and keep the software updated so you receive any safety fixes the manufacturer issues.

If you experience phantom braking or any other dangerous behavior, report it. You can file a complaint with NHTSA at nhtsa.gov/complaints or by calling the Vehicle Safety Hotline at 1-888-327-4236. Those reports are exactly the data that drives federal investigations, and the phantom braking review grew out of hundreds of owner complaints. For drivers who share the road with automated vehicles, the practical advice is the same as ever: leave extra following distance behind any car that may brake without warning, and stay alert at the overpasses, tunnels and shadow lines where vision-based systems are most likely to misread the road.

It also helps to keep your own expectations grounded in how the technology is classified rather than how it is marketed. Treat any safety statistic that comes solely from a manufacturer as a claim to be checked, not a settled fact, and pay attention to the conditions attached to it. The same caution applies whether you drive a Tesla or a rival brand’s assisted-driving system, because every automaker has an incentive to present its technology in the best possible light.

What happens next rests with NHTSA. The agency faces a July 7, 2026 deadline to respond to the senators, and its answers will reveal how aggressively it intends to test the safety claims that sell automated driving to the public. For now, the practical takeaway is unchanged: stay alert, stay in control, and report anything that feels unsafe so the data exists for regulators to act on.

Sources:

• Office of Senator Ed Markey, June 16, 2026 letter to NHTSA
• Markey and Blumenthal letter to Administrator Morrison (PDF)
• NHTSA probes Tesla phantom braking in 2021 to 2022 models
• NHTSA, check for recalls and file a complaint