A labour vote in Ontario has done something increasingly rare in North America’s auto industry: it has put fresh product and investment commitments on paper at the same moment trade policy is making long-term factory planning harder. More than 4,600 Unifor members at General Motors facilities have ratified new three-year agreements that secure more than C$1 billion in Canadian investment, including next-generation truck, engine and transmission work.
The timing is unusually consequential. U.S. President Donald Trump has threatened to raise tariffs on Canadian cars, trucks and auto parts from 25% to 50% on January 1, 2027, after Canada-U.S. trade talks stalled. For GM workers, the new contracts offer clearer commitments on jobs, products and pay. For the wider industry, they also underline how much is riding on whether the tariff threat becomes reality or is negotiated away.
Ratification Turns Promises Into a Three-Year Labour Deal
The agreements were not approved by a narrow margin. Unifor says members covered by the main GMCC agreement, representing workers in Oshawa, St. Catharines and Woodstock, voted 80.5% in favour. At CAMI Assembly in Ingersoll, support reached 96.5%. Together, the contracts cover more than 4,600 workers and run for three years, giving the company and its unionized workforce a defined framework during an unusually unstable period for cross-border trade.
Unifor says the package commits more than C$1 billion to Canadian GM facilities. GM Canada uses an even broader measure, saying planned investments in Oshawa and St. Catharines total approximately C$1.4 billion over the next three years. GM’s figure incorporates a previously announced C$343 million Oshawa program alongside the latest spending. Either way, ratification puts major product and capital commitments alongside the wage and benefit provisions negotiated for workers.
Oshawa Wins the Next-Generation GMC Sierra HD
The most visible product commitment is in Oshawa, where GM will invest an additional C$144 million to add production of the next-generation GMC Sierra Heavy Duty. GM says the plant will build both of its next-generation heavy-duty pickups, the Sierra HD and Chevrolet Silverado HD. The new spending builds on a previously announced C$343 million program for next-generation truck production and manufacturing upgrades, bringing planned Oshawa investment to nearly C$500 million.
For the plant, that is more than another model announcement. Full-size pickups are a core part of GM’s North American business, and keeping Oshawa tied to future generations gives the facility a role beyond the current production cycle. Unifor also says C$63 million in previous commitments for stamping and CCA upgrades at Oshawa have been enshrined in the collective agreement. Workers therefore ratified a package connecting wage gains with future truck and manufacturing work.
St. Catharines Becomes a Powertrain Anchor
St. Catharines is receiving the largest concentration of investment connected with GM’s latest Canadian commitments. The automaker will put C$215 million into a next-generation transmission program, with production work anticipated to begin in late 2029. GM says the Ontario facility will be the sole source for the transmission, giving the plant a strategically important role within the company’s future powertrain network.
That investment comes on top of C$691 million announced in April for sixth-generation V8 engine production. GM says planned investment in St. Catharines now exceeds C$900 million. Equipment for the V8 program has already begun arriving while the plant continues producing the current-generation engine. St. Catharines will become one of three GM facilities making the sixth-generation V8, alongside Tonawanda in New York and Flint in Michigan. That cross-border footprint is also a reminder of why tariffs can disrupt far more than final vehicle assembly.
CAMI Gets a Lifeline, Not a Full Restart
The situation at CAMI Assembly in Ingersoll remains considerably more fragile. The plant is idled, and Unifor says the majority of workers there are on indefinite layoff. The ratified agreement does not announce a replacement vehicle or an immediate restart. Instead, GM has committed to continue assessing opportunities for CAMI while the agreement gives workers more protection during the search for another production mandate.
For eligible laid-off workers, one of the most important provisions is an extension of the Income Maintenance Plan until May 2028. GM has also extended layoff benefits while it evaluates potential work for the facility. CAMI would receive first consideration for Canadian Armed Forces defence production if GM successfully secures such a contract. That provision is not a guaranteed production award, and Unifor has acknowledged that its effort to restore jobs at Ingersoll is unfinished. Still, the agreement gives the plant and its workforce additional time rather than an immediate endpoint.
Workers Secure 3% Annual Raises and New Bonuses
The contracts also deliver the wage pattern Unifor established earlier with Ford. GM workers will receive annual wage increases of 3% over the three-year term. According to the union, full-rate production pay will rise to C$50.20 an hour during the life of the agreements, while skilled-trades rates will reach C$62.71 an hour. Cost-of-living protection is also being renewed, providing another layer of income protection when consumer prices and household costs remain an important concern.
Eligible employees can receive a C$10,000 productivity and quality bonus as well as a C$2,000 December bonus. Retiree health support is being expanded, including higher Universal Healthcare Allowance payments and an extension of payments to surviving spouses. These provisions give the deal an immediate household dimension. Future product allocations can determine job security years from now, while wage increases, bonuses and benefit improvements affect workers much sooner as families navigate an uncertain manufacturing environment.
Trump’s 50% Tariff Threat Changes the Math
The labour deal arrives under a tariff threat capable of dramatically changing the economics of producing vehicles in Canada for the U.S. market. Trump has said U.S. tariffs on Canadian cars, trucks and automotive parts will rise to 50% on January 1, 2027. Canadian-made vehicles already face a 25% U.S. tariff on their non-U.S. content, while the value of U.S. content in CUSMA-compliant Canadian vehicles is exempt under the existing structure.
The threatened increase followed the collapse of recent Canada-U.S. negotiations. The trade arrangement under discussion would have reduced the top-line tariff on Canadian cars and light-duty trucks from 25% to 15%, but disagreements remained over medium- and heavy-duty vehicles. That distinction matters to Oshawa because heavy-duty pickups sit at the centre of GM’s new investment package. The 50% rate has not yet taken effect, meaning negotiations could still change the outcome before January. Manufacturers, however, cannot assume that relief will arrive when planning production.
GM’s Canadian Truck Footprint Is Directly Exposed
GM is far from a bystander in the tariff dispute. Reuters, citing Barclays research, reported that roughly 17% of GM’s Chevrolet Silverado pickup production is based in Canada. GM Canada says Oshawa is also its only North American facility capable of building both light-duty and heavy-duty Chevrolet Silverado pickups on the same line. That connects the Ontario factory directly to one of GM’s most important truck families.
The exposure extends deeper into the vehicle. St. Catharines will produce the sixth-generation V8 engine family alongside plants in New York and Michigan, illustrating how production has been organized around a continental network rather than three isolated national industries. A tariff on Canadian-built vehicles can therefore affect assembly economics, while tariffs on Canadian parts can create additional costs farther downstream in American factories. GM’s investments reinforce its Canadian footprint, but the same projects show why separating the North American industry cleanly along the border would be difficult and potentially expensive.
Canada’s Auto Industry Still Depends Heavily on U.S. Demand
The wider Canadian industry is unusually exposed to any sustained U.S. trade barrier. The federal government says more than 90% of Canadian-made vehicles and 60% of Canadian-made auto parts are exported to the United States. Statistics Canada calculated that U.S. demand accounted for 76.4% of automobile and light-duty motor vehicle manufacturing output and 76.4% of payroll jobs in that industry in 2024, representing roughly 27,000 jobs tied to American demand.
Pressure was visible even before the latest tariff escalation. Statistics Canada reported that motor vehicle parts manufacturing employment fell 9.3% between December 2024 and December 2025, while employment in motor vehicle manufacturing declined 1.3%. In its first-quarter 2026 business-conditions data, more than half of manufacturing businesses reported being negatively affected by U.S. tariffs over the previous year. Against that backdrop, GM’s commitment stands out because major manufacturing investments are being made while the sector’s largest export market is becoming less predictable.
The Stakes Reach Well Beyond GM’s 4,600 Union Members
Canada’s broader auto sector supports more than 500,000 workers and contributes more than C$16 billion annually to national GDP, according to the federal government. More than 1.2 million passenger vehicles were produced in Canada in 2025. Ottawa also identifies roughly 125,000 direct automotive manufacturing jobs as being exposed to the effects of U.S. automotive tariffs.
Ontario carries a particularly large share of that industrial footprint. Federal Job Bank data indicate that approximately 148,300 people worked in Ontario’s motor vehicle, body, trailer and parts manufacturing sector in 2024, equivalent to about 1.8% of the provincial workforce. That helps explain why an investment decision at Oshawa or St. Catharines reaches beyond the gates of one GM facility. Suppliers, transportation businesses and other manufacturers rely on stable vehicle volumes. A billion-dollar investment package can help anchor that network, but sustained tariff-driven production reductions could still spread through the supply chain.
The Deal Buys Certainty, but the Trade Fight Still Decides the Bigger Outcome
Ratification gives GM workers something tangible in an environment dominated by uncertainty: future products, capital spending, wage increases and additional time to pursue work for CAMI. It cannot remove the biggest external risk facing the Canadian industry. Canada-U.S. trade negotiations remain suspended, and Trump’s threatened 50% tariff on Canadian vehicles and parts is scheduled for January 1, 2027. Reuters has reported skepticism among auto executives, partly because previous tariff threats have later been delayed or reduced.
Canada, meanwhile, is preparing for a dispute that could continue. Ottawa has announced new counter-tariffs on C$27.6 billion of U.S. goods effective September 8, with rates of 15%, 25% or 50% depending on the product, while existing Canadian counter-tariffs on U.S. autos remain in place. For GM’s Ontario workforce, the new contract locks in substantially more than a negotiating slogan. The larger test is whether those commitments can translate into sustained production while the rules governing North America’s integrated auto market remain unsettled.
