The US National Highway Traffic Safety Administration (NHTSA) announced the investigation at the weekend, opening an Audit Query (AQ) shortly after the Cybercab's commercial rollout began. The agency said it would "examine the process and technical data on which Tesla relied when certifying the Cybercab and related issues."
NHTSA Administrator Jonathan Morrison stated, "NHTSA fully supports the safe development and deployment of automated vehicles. But as the federal regulator, we need to ensure that all of our laws are followed."
The investigation focuses on Tesla's certification that the Cybercab is "compliant with all applicable Federal Motor Vehicle Safety Standards (FMVSS)." The vehicle famously lacks permanently attached manual controls—no brake pedal, accelerator, steering wheel, or mirrors. The NHTSA noted there are "clear vehicle performance requirements" that automakers must certify their vehicles meet before entering the US market, subject to agency oversight.
"When certified vehicles appear to not adhere to these requirements, NHTSA conducts an investigation," the agency said. Among the questions the probe will examine is "the extent to which Tesla's certification depended on determinations that certain FMVSS are inapplicable to the Cybercab."
Tesla is not the first company to operate autonomous vehicles without conventional controls on US roads. In July 2026, Amazon subsidiary Zoox was granted a two-year exemption for up to 2,500 exempted vehicles per 12-month period for commercial deployment. The NHTSA is in the process of updating requirements for autonomous vehicles designed never to be operated by a human, but Tesla appears to have proceeded without seeking a similar exemption, prompting the investigation.