General Motors Co.'s Opel unit and Renault warned they would have to reduce production after Japan's earthquake last week led to shutdowns of car parts factories in the country.
Opel called a 24-hour production stop for next Monday and an eight-hour halt next Friday at its plant in Saragossa, Spain, due to the lack of an electronic item which had not arrived from Japan. Unions say about 2,400 cars will not be made during the stoppage.
Renault said it would cut output at its factory in Busan, South Korea, by 15 to 20 percent after disruptions to Japanese supplies mainly affecting the Renault-owned Samsung SM7. The factory normally produces 20,000 vehicles per month.
"Production should go down by 15 to 20 percent, corresponding to 3,000 fewer cars," said a Renault spokesman. "We hope a solution will be found rapidly."
Plant shutdowns across Japan following the earthquake, tsunami and nuclear crisis threaten supplies of everything from semiconductors to car parts for manufacturers across the globe.
Even where factories in Japan are operating, power outages, shortages of fuel and raw materials and ruptured logistics mean products and parts face delays in getting to customers.