DETROIT -- A labor strike at General Motors Co.'s plant in Rayong, Thailand, over the last few months is hitting home.
American Axle & Manufacturing Holdings Inc. said the strike is expected to cost the supplier $15 million in the first quarter of 2013 due to loss of production, in a U.S. Securities and Exchange Commission filing Tuesday.
American Axle supplies front and rear axles as well as drive shafts from its own Rayong plant for GM's midsize-truck production, which includes the Chevrolet Colorado, spokesman Chris Son said in an e-mail.
About 2,000 assembly line workers walked off the GM factory floor Feb. 8 after union officials said plant managers added a Saturday shift without offering overtime pay, the local newspaper Pattaya Mail reported.
The GM plant was shut down for three days before it resumed production on Feb. 14, Laurent Berthet, director of communications for GM in Southeast Asia, said in an e-mail.
The Pattaya Mail reported March 14 that 3,000 workers remained on the line, but vehicle production plummeted from 600 cars per day to 100 cars per day.
Berthet said the "vast majority" of workers have returned to the assembly line and the plant is running two shifts. An unknown number of employees remain on strike, but it does not impact production, she said in an e-mail.
It's unknown which other companies supply the plant, but TRW Automotive Inc. and Delphi Automotive Systems plc have plants in Rayong, and Visteon Corp.'s joint venture Halla Visteon Climate Control Corp. has a sales office in the Thai city.