Vehicles stand on the halted assembly line at a Hyundai Motor plant in Ulsan, South Korea, on August 20, 2013. The company's labor union staged a strike on that day, demanding a higher wage. Photo: CFP

Shares in Hyundai Motor Co rose as much as 3.5 percent Wednesday during trading after a court decision soothed anxiety about a potential rise in its labor costs.

South Korea's Supreme Court Wednesday overturned previous rulings with automotive parts supplier KB AutoTech in a dispute that would affect other wage lawsuits filed by workers at major manufacturers like Hyundai Motor and General Motors.

The court agreed that fixed bonuses should be included as part of regular wages, but said claiming unpaid wages based on recalculated regular wages would lead to a significant financial burden to a company.

Some workers at automakers and shipbuilders, which rely heavily on overtime work, have already lodged separate lawsuits related to the so-called ordinary wages, demanding changes in their wage plans.

About 150 cases have been filed regarding ordinary wages as of September, according to estimates by labor organizations.

Hyundai Motor shares, which rose as much as 3.5 percent during trading, closed up 0.2 percent at 227,500 Korean won ($220) per share.

"With the weak yen pressuring automakers, Hyundai Motor and Kia Motors received a strong boost from the court's decision that enabled them to consolidate profits," Korea Investment & Securities analyst Suh Sang-moon said.

GM CEO Dan Akerson told South Korean President Park Geun-hye in August that the ongoing wage litigation is a major barrier to maintaining operations in South Korea, according to media reports.

GM expects its South Korean production to fall by as much as 20 percent by 2015 after which it plans to stop selling Chevrolet cars in Europe.