About 18,000 non-unionized workers across North American operations are eligible for the buyout package.
At least 18 factories and other facilities run by General Motors, Ford and Fiat Chrysler affected.
Automakers were hoping that the plants can return to normal operations as temperatures moderate on Saturday and into next week.
Some GM vehicles, including the Chevrolet Blazer, Trax and GMC Terrain are made only in Mexico.
Ekos Research poll notes 45% of Canadians support an outright boycott.
About 2,600 unionized workers and 340 other staff to lose jobs.
Ontario’s premier will sit down with GM executives Tuesday for his first face-to-face meeting since the company announced the Oshawa plant closure in November.
Will discuss opportunities to support workers who will be out of a job when the Oshawa plant closes.
Automaker rejects Unifor plan, going ahead with the shutdown.
“GM today, by reconfirming their decision, has not only picked a fight frankly with Unifor, but they have picked a fight with all of Canada,” said Jerry Dias.
That still leaves the majority of the cuts hitting white-collar workers and Canadians.
Preserving the $7,500 tax incentive for buyers is crucial for GM as the company pivots from internal combustion engines in favour of building cars powered by batteries or hydrogen fuel cells.
Alliance will lobby to “re-invest in public services,” and ask Ford to encourage employers to create “good stable jobs.”
Peer-to-peer platform allows GM customers to rent out their vehicles, offsetting some ownership costs.
Jerry Dias wants GM to reverse plans to cut more than 14,000 jobs, including 2,500 production workers in Oshawa, Ont.