Elon Musk’s posting habits are putting Tesla under the microscope, again.

Regulators investigating Tesla’s full self-driving have asked the company for more information about a series of X posts in which CEO Elon Musk said drivers could text and brew espresso while using automated driving-assist technology.

In a request for information sent to Tesla on July 2, officials from the National Highway Traffic Safety Administration (NHTSA) asked the company to clarify posts made to Musk and Tesla’s accounts.

These include a December 2025 post in which Musk said FSD users could text and drive “depending on [the] context of surrounding traffic.”

“This is great. Make your espresso on the road while your Tesla drives itself,” Musk wrote in another post cited in the document. The billionaire was responding to a video that showed a Tesla owner using an espresso machine and reclining his seat while the FSD was activated.

NHTSA also cited posts from Musk saying the FSD can “operate in all conditions” and that an FSD upgrade will “substantially reduce” the need for driver attention, as well as posts from Tesla promoting the technology.

The regulator asked Tesla to clarify whether these examples were “accurate and consistent” with FSD’s capabilities, and whether the company had done anything to reduce the potential for “misunderstanding or misuse.”

On its website and in owner’s manuals, Tesla makes it clear that drivers using fully autonomous (supervised) driving must pay attention to the road and be prepared to take control at all times.

This is not the first time Tesla has faced legal and regulatory scrutiny for the way it promotes FSD.

The Model Y maker was ordered last year to pay $242 million in damages in a wrongful death lawsuit alleging that Tesla’s advertising exaggerated the capabilities of Autopilot, FSD’s predecessor, and the company reached a deal to avoid a ban in California in February after a judge ruled that its “Autopilot” and “Full Self-Driving” brands were misleading.

The NHTSA investigation, which was opened in October 2024 and updated to an engineering analysis in March, looks at the FSD’s ability to alert the driver in low visibility conditions. The investigation was opened after several reports of Tesla accidents in areas where visibility was reduced by “sun glare, fog or airborne dust.”

Tesla did not immediately respond to a request for comment.