Donald Trump's tariffs on Mexico and Canada could hit major car manufacturers.peeterv/Getty ImagesDonald Trump's proposed tariffs could raise car prices, impacting US and European automakers.Tariffs may cost carmakers 17% of annual earnings and lead to credit downgrades, per S&P Global.General Motors, Jaguar Land Rover, Stellantis, and Volvo could be hit the hardest.President-elect Donald Trump's new tariff proposals could hit American and European carmakers hard — and could push prices up for your next car.A Friday note by S&P Global estimates a 25% tariff on Canadian and Mexican imports, coupled with a 20% tariff on light vehicle imports from the EU and UK, could cost some carmakers 17% of their annual earnings — and as high as over 30% — before factoring in interest, taxes, depreciation, and amortization.Higher tariffs could hit General Motors, Jaguar Land Rover, Stellantis, and Volvo hardest, S&P Global said.