Tesla recalls all vehicles sold.

Tesla is recalling nearly all of the vehicles it sold in the U.S., more than 2 million across its model lineup, to fix a defective system that’s supposed to ensure drivers are paying attention when they use Autopilot. Documents posted Wednesday by U.S. safety regulators say the company will send out a software update to fix the problems. The recall comes after a two-year investigation by the National Highway Traffic Safety Administration into a series of crashes that happened while the Autopilot partially automated driving system was in use. Some were deadly. The agency says its investigation found Autopilot’s method of ensuring that drivers are paying attention can be inadequate and can lead to foreseeable misuse of the system. The recall covers models Y, S, 3 and X produced between Oct. 5, 2012, and Dec. 7 of this year. The software update includes additional controls and alerts “to further encourage the driver to adhere to their continuous driving responsibility,” the documents said. The update was to be sent to certain affected vehicles on Tuesday, with the rest getting it at a later date, the documents said.