The first all-day strike by workers at South Korean carmaker Hyundai Motor in 12 years halted production completely on Monday.
The walkout by both day shifts in pursuit of higher pay affected all three Hyundai plants in South Korea, a spokesman for the company said.
In the absence of talks, the union has threatened to continue striking for six hours a day in the coming days.
A provisional agreement in August between management and the union was rejected by the workers.
There was a series of token strikes in the lead-up to Monday's complete walkout.
Hyundai Motor and its sister company Kia Motors are together the fifth largest carmaker in the world.
South Korea's market leader has already booked losses of 2.5 trillion won (2.26 billion dollars) this year as a result of the strikes, which have resulted in a production shortfall of 114,000 cars.
"Although unhappy with the temporary stop in production, we will continue to work together with the union to resolve the problem as swiftly as possible," a statement from the company said.