Last week, it was announced that US car tariffs on South Korea would be reduced to 15 percent.
Hyundai Motor had risen 4.1 percent at noon on Tuesday while Kia Corp had risen 3.4 percent.
South Korea's Kospi index rose 1.3 percent.
The Nikkei 225 index in Japan added 0.4, while the broader Topix climbed 0.2.
The Hang Seng in Hong Kong is up 0.1 percent.
China's Shenzhen, on the other hand, is down 0.8 percent. Shanghai is also down 0.6 percent.
