General Motors will invest $144 million at its 5.1-million-square-foot Oshawa Assembly plant and has pledged not to sell or close its idled CAMI facility in Ingersoll while it searches for new production.

The commitments stand in contrast to the uncertainty surrounding another major Ontario automotive property. Connect reported this month that Stellantis is considering selling its idled 269-acre Brampton Assembly site at 2000 Williams Parkway E., which contains about 2.95 million square feet of manufacturing space.

GM’s Oshawa investment, included in a new three-year collective agreement ratified by Unifor members, will add production of the next-generation GMC Sierra heavy-duty pickup at 900 Park Rd. S. The plant will also build the next-generation Chevrolet Silverado HD.

The spending builds on a previously announced $343-million program for truck production and manufacturing upgrades, bringing planned investment in the Oshawa complex to nearly $500 million. The plant is expected to operate two shifts through the agreement after GM shelved plans for a third shift in January.

At CAMI Assembly, 300 Ingersoll St. S., GM committed in writing to retain the property while it pursues new production. The automaker halted Chevrolet BrightDrop electric-van production there in October 2025, leaving the purpose-built manufacturing facility without a vehicle program.

GM has extended layoff benefits for CAMI workers through May 2028 under the ratified agreement. The automaker also agreed to consider the Ingersoll plant first for production tied to any future Canadian Armed Forces contracts awarded to GM. Its GM Defense Canada unit already supplies light tactical vehicles based on the Chevrolet Colorado ZR2 platform.