Tariffs, and their potential detrimental impacts on vehicle affordability, company profits, global competitiveness, and new-car demand, have hung over the entire auto sector, including GM, for months. Coming into Thursday trading, GM stock was down 1% since the Nov. 5 election, 11 percentage points behind the S&P 500.

The trade deal with Japan is also giving investors hope that there could be similar reductions on tariffs for vehicles imported from other countries—including trade agreements that would benefit U.S.

TOKYO (CBS.MW) -- General Motors Corp. plans to revamp its sales network in Japan in order to boost sluggish sales here and get a strong foothold in the Asian auto market. GM's Japan arm, General ...

TOKYO--General Motors thinks Japan is ready for an American-brand small car and is banking on the Chevrolet Aveo, its first small-car entry in half a decade in Japan, to help boost sales here this ...