FILE - Tesla vehicles charge at a station in Emeryville, Calif., Aug. 10, 2022. Federal highway safety investigators want Tesla to tell them how and why it developed the fix in a recall of more than 2 million vehicles equipped with the company's Autopilot partially automated driving system. In a letter to Tesla posted on the agency's website Tuesday, May 7, 2024, investigators wrote that they could not find a difference between warnings to the driver to pay attention before the recall and after the new software was sent out. (AP Photo/Godofredo A. Vásquez, File)