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General Motors Co. said on Friday it has extended production at its Detroit Hamtramck plant until January, 2020, contrary to its earlier plan to discontinue production there in June and contrary to its refusal to meet a Unifor request to keep its Oshawa, Ont., plant open until 2020.

The No. 1 U.S. auto maker is revamping its operations, which include plant closures and thousands of job cuts as it looks to boost profitability in the wake of declining U.S. auto sales.

The Hamtramck plant will continue to produce the Chevrolet Impala and Cadillac CT6 sedans until early next year, the company said.

“We are balancing production timing while continuing the availability of Cadillac advanced technology features currently included in the CT6-V - the Blackwing Twin-Turbo V-8 [engine] and Super Cruise [driver assistance system],” GM said.

The plant has already discontinued production of the Buick LaCrosse sedan and Chevrolet Volt electric hybrid car.

Detroit-based union United Auto Workers’ president Gary Jones said GM’s decision to continue production at the plant was a relief for the workers as well as their families.

“We commend GM for today’s decision and we reiterate the importance of a collective bargaining process in times like these,” Mr. Jones said.

On Thursday, GM’s chief executive officer Mary Barra said she will not appear before Canadian legislators to answer questions about the automaker’s future in the country, but lower-ranking executives will appear.

GM said in November it would close its Oshawa, Ont., assembly plant by year-end, part of a broad restructuring affecting four other plants in the United States, as it cuts costs and invests in electric and self-driving vehicles.

Last month, Parliament’s Standing Committee on Industry, Science and Technology approved vice-chairman Brian Masse’s request for Ms. Barra to “explain GM’s future and continued commitment to the Canadian automotive and manufacturing industry.”

Ms. Barra’s “complex schedule wouldn’t allow her to be there in a reasonable period of time,” GM spokesman David Paterson said. He added that two “subject matter experts” – GM Canada president Travis Hester and vice-president of North American Manufacturing Gerald Johnson – would likely appear before the committee in March.

Mr. Masse, a member of the opposition New Democrats, said it was frustrating that Ms. Barra would not attend because she is the “principal strategist” behind GM’s restructuring and could explain why Oshawa did not merit investment.

“We need to understand the future jobs and commitment of General Motors because we need to better understand how we fit in their global operations,” Mr. Masse said.

Canada’s auto union, which represents 2,600 assembly-line workers in Oshawa and 1,800 workers at plants supplying the operation, has waged a high-profile campaign aimed at convincing GM to keep the plant open until September, 2020, when the current collective agreement ends.

GM Canada has said repeatedly it will not change its business decision.

Meanwhile, an Ontario Labour Relations Board hearing on Thursday reviewed an application by GM to halt “unlawful strike activity” at the plant. A decision was expected shortly.

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