(AUTONEWS) — General Motors plans to idle the plant where it assembles the Chevrolet Volt plug-in hybrid for four weeks starting next month, two people familiar with the plans said.

GM will close its Detroit-Hamtramck plant from Sept. 17 until Oct. 15, one of the sources said. Union representatives last week told the plant’s roughly 1,500 workers about the scheduled downtime, the source said.

GM also notified suppliers last week, according to another source in the supply chain.

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