In October, almost 65% of new vehicles sold in America were trucks or SUVs.
GM now builds just one vehicle in China that it exports to the United States - the Buick Envision.
The person briefed on the matter confirmed that GM planned a major announcement on the future of the Oshawa plant, but said the automaker wanted to notify employees of its plans before making any announcements about the plant.
"We estimate sedans operate at a significant loss, hence the need for classic restructuring", he wrote.
Some 8,000 salaried employees and 6,000 hourly workers will either lose their jobs or be reassigned to other plants, and more layoffs are likely on the horizon, industry experts said. Some will take buyouts while others will be laid off. US sales of the Impala were down 13 percent through September. The company also has said tariffs on imported steel, imposed earlier this year by the Trump administration, have cost it $1 billion.
Opening in 1907 as a manufacturing base for the Canadian McLaughlin Motor Car Company, both the plant and company were purchased by General Motors 11 years later.
Rivals Ford Motor Co (F.N) and Fiat Chrysler Automobiles NV, have both curtailed USA vehicle production.
While boss Mary Barra insisted the firm is positive about the future, the plan will send a chill through markets, given Cadillac and Chevrolet maker GM's traditional role as a bellwether for the U.S. economy.
Trump says he's being very tough on GM chief executive officer Mary Barra.
With U.S. vehicle sales lagging, that means several GM auto plants have fallen to just one shift, including its Hamtramck and Lordstown assembly plants.
General Motors Co.'s (GM's) plan to cancel production at US factories and cut thousands of jobs drew a swift rebuke in the industrial heartland where US President Donald Trump posted surprising electoral wins premised on his pledge to restore manufacturing. "They're all coming back". GM said its slimmed down production plan would allow it to share technology across all of its vehicles, reducing the amount of time and labor it takes to build cars.
General Motors on Monday announced plans to halt productions at three factories in North America and to close two propulsion-component plants in the US.
Flavio Volpe, president of the Automotive Parts Manufacturer's Association, said there has been a surge of investment in Mexican auto plants ahead of the recent free-trade talks. Before 1953, the facility produced McLaughlin Buicks and was one of six locations building Chevrolet before it merged with GM in 1918.
The Detroit-based automaker said it would end production by the end of 2019 at its Lordstown Assembly plant in northeast OH; its Detroit-Hamtramck Assembly plant in southeast MI; its Oshawa Assembly plant in Ontario; its Baltimore Operations parts plant; and its Warren Transmission Operations plant in southeast MI.
"The United States saved General Motors, and for her to take that company out of OH is not good", Mr. Trump said.
"So far, President Trump has been asleep at the switch and owes this community an explanation", Ryan said in a statement.
GM did not immediately comment on Trump's remarks, but the company noted it has other facilities in OH including a transmission plant in Toledo and metal center in Parma.
"Everything is up in the air", she said.
Other vehicle makers have also tried to trim costs. "It would be like breaking up a family".
One of the largest factories in our region is now slated to close.
The closures also drew sharp criticism from the USA and Canadian labour union representing GM workers, which accused the company of shifting production overseas at the expense of North American workers.
Barra is reducing staff from operations that make conventional cars and hiring people who can design electric cars or add software prowess to GM Cruise, the automaker's autonomous vehicle unit in San Francisco.
GM also said that the company will jettison the Buick LaCrosse, Chevrolet Impala and Cadillac CT6 sedans next year. Currently, the plant builds the Cadillac XTS, the Chevrolet Impala, the Chevrolet Silverado and the GMC Sierra.
Altogether, GM has five auto factories with plenty of unused capacity in Kansas City, Kansas; Lordstown; and Detroit-Hamtramck, Lansing, and Orion Township, Michigan.
The cuts will happen during the remainder of the year and the first quarter of 2019.
"That plant is the economic lifeline of the whole valley", said Lordstown Mayor Arno Hill. "I'm curious to know the reasons, I'm curious to know why we weren't informed or who has been informed". "It's hard, it's terrible".
Sales of Cruze, built at Lordstown, fell 27 percent through September 2018.