NEW YORK — U.S. regulators have opened an investigation into 2.6 million Teslas after reports of crashes involving the use of company technology that allows drivers to remotely command their vehicle to return to them, or move to another location, using a phone app.

The National Highway Traffic Safety Administration also said Tuesday that Tesla did not report any of the accidents. Tesla is under order to report crashes on “publicly accessible roads” involving vehicles being operated through its autonomous driving technology.

The new investigation follows another inquiry launched in October looking into the company’s “Full Self-Driving” system after getting reports of crashes in low-visibility conditions, including one that killed a pedestrian. That investigation covers 2.4 million Teslas from the 2016 through 2024 model years.

One driver filed a complaint after a crash while using Tesla’s “Actually Smart Summon” technology, and NHTSA is looking into another three similar incidents based on media reports, the NHTSA said. The agency is looking into 12 incidents reported by users of the technology in all.

Each of the vehicles failed to detect posts and other parked vehicles, the NHTSA said.

Regulators say the vehicles struck objects because the users had “too little reaction time to avoid a crash, either with the available line of sight or releasing the phone app button, which stops the vehicle’s movement.”

Ethics experts are worried that once President-elect Donald Trump takes office, Musk will push him to ease oversight of Tesla, which just suffered its first decline in annual sales in more than a decade.

Musk donated an estimated $250 million to Trump’s presidential campaign and is a frequent guest at Trump’s Mar-a-Lago estate in Florida. Trump has put Musk in charge of an advisory group, the Department of Government Efficiency, that will recommend where to cut government expenses and staff at federal agencies and reduce regulation.