Why Tesla (TSLA) fell 7.90%
Tesla (TSLA) fell 7.90% on September 4, 2026 — Steering-wheel probe sparks robotaxi safety fears.
What happened
Federal regulators opened a formal investigation into Tesla's Cybercab after the company launched a car with no steering wheel, raising compliance and safety approval risks for the vehicle.
Why it moved
A regulatory probe increases the probability that the Cybercab faces design modifications, delayed certification, or recall scenarios—all of which push out Tesla's robotaxi revenue inflection and undermine near-term…
Why it matters
Tesla's Robotaxi, EV & Physical AI thesis has already stalled momentum in recent weeks as execution risk mounts; the regulatory investigation is a concrete setback to the Cybercab's path to commercial deployment and…
What would break the thesis
If regulators narrow the probe quickly or Tesla demonstrates that the no-steering-wheel design meets all federal safety standards without modifications, the immediate overhang could ease and momentum could return.