General Motors, facing rising commodity costs in a trade showdown with Europe and elsewhere, cut its outlook for the year.
The diminished expectations overshadowed a strong second quarter and shares tumbled more than 5 percent before the opening bell. Other U.S. automakers were dragged down in early trading. Ford Motor Co. posts earnings after the bell Wednesday.
Quarterly profit rose 44 percent to $2.39 billion, or $1.66 per share. A year ago, the company had a loss on the sale of its European Opel unit.
Excluding charges, the Detroit company earned $1.81 per share, topping Wall Street expectations for $1.78, according to a poll by FactSet. Revenue was flat at $36.76 billion, falling short of Wall Street forecasts.
GM now expects 2018 per-share profits of $5.14, down from $6. It cited "recent and significant increases in commodity costs" along with unfavorable currency exchange rates. Wall Street had been projecting 2018 per-share earnings of $6.42.
President Donald Trump imposed steep tariffs on steel and aluminum coming out of Canada, Mexico and the European Union. The 25 percent tariff on steel and 10 percent tariff on aluminum, which took effect in June, have driven up costs sharply as domestic producer raise prices.
Shares of Ford slid about 3 percent. Tesla Inc. slide almost 3 percent. Auto parts companies slid as well.