The General Motors (GM) assembly plant in Oshawa on April 10, 2025 (aerial photo).
General Motors has canceled shifts at its Oshawa plant through next Monday due to a parts shortage. The Unifor union, which represents about 3,000 workers at the plant, confirmed the news to Toronto's CTV News.

The union said the problem was caused by a shortage of a transmission part. "GM has informed the union that the remaining shifts at the Oshawa plant this week have been canceled due to a shortage of transmissions being shipped from the Toledo plant," Unifor said in a statement.

"Production has been temporarily impacted and we are working to resolve this issue to return to normal operations," GM said in a statement.

The shutdowns come as concerns grow about the impact of U.S. President Donald Trump's tariffs on Ontario's auto industry. Last week, General Motors announced plans to hire an unspecified number of temporary workers at its Fort Wayne, Indiana, plant to boost production in the wake of rising auto import tariffs.

The Fort Wayne plant builds the GMC Sierra and Chevrolet Silverado trucks. Those vehicles are currently the only products at the Oshawa plant.

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