Tesla said on Friday that its semiautonomous Autopilot feature had been turned on before a fiery crash of a Model X sport-utility vehicle that killed the driver last week in California, raising more questions about the safety of the company’s self-driving technology.

This is the second fatal crash in which the Autopilot system had been engaged, including a 2016 crash in Florida that killed a Tesla driver. The National Highway Traffic Safety Administration concluded that the Florida crash did not result from a flaw in the system, but the agency found that the system lacked safeguards to prevent its misuse.

Federal investigators are looking into the crash in California, which occurred March 23.

The company said in a statement posted on its website that the driver in the crash last week had “about five seconds and 150 meters of unobstructed view” before he crashed into a median barrier, adding that “the vehicle logs show that no action was taken.” The driver, Wei Huang, had been given “several visual and one audible hands-on warning earlier in the drive,” Tesla said.

Still, Tesla defended its Autopilot hardware. In its statement, the company said there was one automotive fatality for every 86 million miles across all vehicles in the United States, compared with one fatality for every 320 million miles in vehicles equipped with Autopilot.