Trump's 25% tariffs on imported vehicles and upcoming 25% levies on auto parts are expected to add thousands of dollars to the costs of new cars and trucks.
Ford and Stellantis are offering employee-pricing programs, while Hyundai said it would not raise prices for at least two months to ease consumer concerns.
Mortgage rates fell sharply Thursday, following the Trump administration's tariff announcement, but a huge share of Americans still can't afford to buy a home.
About 900 U.S.-represented employees at supporting plants will be temporarily laid off, in addition to about 4,500 hourly workers at the Canadian plant.