The company says a Model X vehicle involved in a fatal crash in the US was in Autopilot mode.
Electric carmaker Tesla says a vehicle involved in a fatal crash in California was in Autopilot mode, raising further questions about the safety of self-driving technology.
One of the company's Model X cars crashed into a roadside barrier and caught fire on 23 March.
Tesla says the 38-year-old driver, who died shortly afterwards, had activated Autopilot moments before the accident.
But they did not say whether the system had detected the concrete barrier.
"The driver had received several visual and one audible hands-on warning earlier in the drive," a statement on the company's website said.
"The driver's hands were not detected on the wheel for six seconds prior to the collision."
"The driver had about five seconds and 150m (490ft) of unobstructed view of the concrete divider... but the vehicle logs show that no action was taken," the statement added.