General Motors has cancelled shifts at its Oshawa plant until Monday amid a part shortage, the union representing workers at the assembly plant confirmed to CTV News Toronto.

Unifor, which represents about 3,000 employees at the Oshawa facility, said the issue is related to a transmission part shortage.

“General Motors has informed the union that shifts have been cancelled for the remainder of the week at Oshawa Assembly Plant due to a shortage of transmissions from Toledo,” Unifor said in a statement to CTV News.

In a statement from GM, the company said production is “temporarily impacted” due to shortage.

“...we’re working to resolve this issue and return to regular operations,” a spokesperson for GM said in a statement to CTV News Toronto.

The cancelled shifts come amid fears over how U.S. President Donald Trump’s tariffs will impact Ontario’s auto manufacturing industry.

Last week, GM announced plans to hire an unspecified number of temporary employees at its Fort Wayne, Ind., assembly plant to increase production amid U.S. tariffs on imported vehicles.

The GM facility in Fort Wayne manufactures the GMC Sierra truck and the Chevrolet Silverado, which is currently the only vehicle produced at the assembly plant in Oshawa.