Workers build a truck as it goes through the assembly line at the Ford Kentucky Truck Plant in Louisville, Kentucky.
Bill Pugliano | Getty Images
Ford and GM shares both added about 1% after opening with declines on the day.
The White House has until May 18 to make a decision on whether it will add duties to imports of vehicles and auto parts.
Trump sees auto tariffs as key leverage in trade negotiations with the European Union and Japan. But the E.U. has plans to retaliate with its own tariffs on up to $300 billion of U.S. goods.
Bloomberg first reported the auto tariffs delay.