Tesla is facing an investigation from federal safety regulators into whether it delayed notifying the government about crashes involving its driver assistance technology.

The National Highway Traffic Safety Administration (NHTSA) is looking into whether or not the company is complying with regulations requiring it to report data about crashes involving its cars when they are using certain driver assistance features. In a federal filing released Wednesday, NHTSA said that “reported crashes occurred several months or more before the dates of the reports. The majority of these reports involved crashes in which … the time required a report to be submitted within one or five days of Tesla receiving notice of the crash.”

Many Tesla vehicles come equipped with Autopilot, a system designed to

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