GM Daewoo Auto and Technology on Monday said it would shut down two more plants from today until 4 January.
Its main Bupyeong plant has already been idle since 1 December.
GM Daewoo said production would resume at all plants on 5 January.
Its sales last month plunged 28.8% year on year to 62,256 vehicles.
Hyundai on Monday announced more production reductions as well and Ssangyong has found itself unable to pay workers this month.
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By GlobalDataThe Korea Automobile Manufacturers Association recently forecast that domestic sales by Korean automakers would drop 8.7% next year to 1.05m units, the lowest since the financial crisis of 1998.