Hyundai Motor's labour union is planning to stage more strikes over five consecutive days this week starting today (Monday, December 11), according to the Korea Herald.
The newspaper said the union and Hyundai's management have failed to reach agreement over pay rises and job security.
The Herald said the strikes will involve partial four-hour strikes at car manufacturing plants and parts factories.
It said the union has demanded a 154,883 won (USD$142) raise in base monthly pay, a bonus worth 30 percent of last year's net profit and better job security.
Hyundai's management has suggested a pay rise of 42,879 won.
"Hyundai Motor will handle the walkout according to principles," Hyundai Motor said.
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By GlobalDataContinued walkouts will delay the supply of Kona SUVs set for launch in the US in the first half of 2018, Hyundai Motor added.
Hyundai has said the company faces "difficult times" at present, including weak vehicle demand in key overseas markets.
Until now, unionised workers have staged walk outs at the company's Ulsan plant, halting three assembly lines for four to six hours daily four days per week. This has reduced output by 43,000 vehicles so far this year.