ST. LOUIS — Autoworkers at General Motors’ assembly plant in Wentzville will be temporarily out of work beginning later this month.

A spokesperson for GM said in a statement Monday that the company has “temporarily adjusted production schedules at Wentzville Assembly to address supply chain issues and align with overall business needs.”

Diana Forbes, GM spokesperson, said the plant is expected to return to normal operations Oct. 20.

A notice posted to the United Auto Workers Local 2250 website says the reduction is “due to parts availability” and that the layoff will take place from Sept. 29 to Oct. 19.

The notice, dated Friday, was signed by plant executive director Eric Shelhorn and local union Chairman Jon Daugherty.

It said the layoff would affect most workers on all three shifts at the Wentzville plant, where workers build mid-size pickup trucks and full-size vans for General Motors.

“We appreciate your understanding and flexibility as we work through this issue,” Shelhorn and Daugherty told workers.

Wentzville Mayor Nick Guccione on Monday said he has heard the issue is a parts shortage but that he hasn’t heard from the company which parts are affected.

“Production is usually pretty steady,” Guccione said. “They don’t like to stop the line for anything.”

The Wentzville plant opened in 1983.

It shut down multiple times in 2021 due to a worldwide semiconductor shortage.

Production was also affected in 2023 when GM workers at Wentzville and across the country went on strike as the United Auto Workers union negotiated a new labor agreement with the Detroit-based automaker.

Though Wentzville workers rejected the five-year deal, GM workers nationwide ratified it, which promised general wage increases of at least 25%, plus cost-of-living bumps.

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