Shares tumbled 5.92% on September 4 after Tesla's long-awaited Cybercab robotaxi launch in Austin collided with a same-day federal safety probe, raising hard questions about whether the company's most important growth story just got years more complicated.
The Feds Moved Within Hours of Launch
NHTSA opened an Audit Query on September 4 to investigate Tesla's certification that its Cybercab meets all applicable federal vehicle safety standards.
The Cybercab lacks permanently attached conventional controls, including a steering wheel, brake pedal, accelerator pedal, and mirrors — equipment federal rules have always assumed a road vehicle would have. NHTSA will examine the extent to which Tesla determined that certain safety standards were simply not applicable to the vehicle. The audit covers up to 1,000 units, though it does not currently ground the fleet or prohibit Tesla from operating — an audit query is an investigative step, not an enforcement action.
The Zoox Precedent Suggests This Could Take Years The only comparable case is chilling for bulls. When Amazon's Zoox tried to self-certify a steering-wheel-free robotaxi in 2022, NHTSA opened the same type of audit. Zoox spent the next four years navigating federal scrutiny, recalling its entire 105-vehicle fleet, and filing for exemptions from eight safety standards before finally receiving commercial clearance on July 30, 2026.
Investors who have already waited two years since the Cybercab's unveiling may not be willing to wait three more — and there's no way to tell when full service might begin.
A Muted Launch Made the Regulatory Hit Worse
CEO Elon Musk wasn't at the event, attendance was limited to a small group of shareholders and content creators under NDAs, and Tesla did not livestream it.
Only 45 Cybercabs were registered in Texas, and no NHTSA exemption had been filed. Morgan Stanley analyst Andrew Percoco had warned beforehand: "If Thursday's event is merely an unveiling with limited vehicles committed to the road, we expect the stock to sell off." That's exactly what happened. Trading volume hit 64.4 million shares — roughly 53% above the three-month average — signaling broad, conviction-driven selling.
A Sky-High Valuation Leaves No Room for Delay
Tesla trades at a price-to-earnings ratio above 320 — an extreme figure that rests mostly on new business lines still in development.
JPMorgan expects a minimal Cybercab fleet on the road by year-end 2026, expanding to roughly 9,000 by end of 2027. Any multi-year regulatory delay would push meaningful robotaxi revenue further out, testing the patience embedded in that premium. At €305.30 today, the stock is still searching for a floor.