What was the Decision Behind GM Idling Workers at EV Plant?

General Motors's decision to temporarily idle 1,300 workers at its Detroit-Hamtramck assembly plant signals a significant recalibration in the automotive supply chain.

The move at Factory ZERO, where the company manufactures electric vehicles (EVs), reflects broader adjustments rippling through manufacturing networks as demand fluctuates and material flows shift across the sector.

Kevin Kelly, Senior Director of Corporate News Relations at GM, tells Crain's Detroit Business: "Factory ZERO will temporarily adjust production to align EV production with market demand."

This production realignment comes as GM recorded a US$6bn charge to close some EV related investments in January 2026, indicating substantial restructuring within the company's supplier ecosystem and manufacturing footprint.

Supply chain realignment at Factory ZERO

According to Crain's Detroit Business, the 1,300 workers remaining at Factory ZERO had a temporarily idle plan for the period 16 March 2026 to 13 April 2026.

"Impacted employees will be placed on a temporary layoff and may be eligible for subpay and benefits in accordance with the GM-UAW national contract," Kevin told Crain's Detroit Business in an email.

This latest production pause follows a mass layoff at the plant in 2025, where GM announced via a WARN Act notice to the State of Michigan that the company planned to lay off 1,140 workers at the plant. The affected roles included Quality Operators, Assembly Operators and Material Operators, positions critical to maintaining material flow and quality control throughout the manufacturing process.

GM listed its reason for the company action in 2025 as "due to production schedule adjustment required to adapt to slower near-term EV adoption."

The production halt could disrupt material flows from suppliers providing components specifically for EV manufacturing. In 2020, GM announced a US$2.2bn investment in its Detroit-Hamtramck assembly plant, which was designed to produce a variety of all-electric trucks and SUVs as Factory ZERO. The EVs manufactured at the plant include the GMC HUMMER EV Pickup, 2024 GMC HUMMER EV SUV, Cadillac LYRIQ and the Cruise Origin.

The plant has been open since 1985. Before the plant production lines shifted to EVs, the plant produced and built the Cadillac CT6 and the Chevrolet Impala.

At the opening of the plant, which was attended by former US President Joe Biden, GM Chair and CEO Mary Barra said: "GM's manufacturing expertise is key to achieving our all-electric future.

"This is a monumental day for the entire GM team. We retooled Factory ZERO with the best, most advanced technology in the world to build the highest quality electric vehicles for our customers."

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Manufacturing network shifts to ICE production

While Factory ZERO scales back operations, GM's Flint Assembly plant in Michigan that makes internal combustion engine (ICE) vehicles is going to run six days a week from June 2026, according to the Wall Street Journal. The reasoning GM cited for this was strong demand for powerful pickups, even with high fuel prices. This shift could mean suppliers previously focused on EV components may need to pivot towards traditional powertrain materials and parts.

GM's plant in Flint is its longest running assembly site in North America, where it has been producing cars since 1947. The factory is now known for manufacturing heavy duty trucks such as the Chevrolet Silverado 2500. In GM's financial year 2025, it recorded its best total Silverado sales in five years.

According to the Wall Street Journal, a GM spokesperson says: "General Motors is making strategic adjustments to Flint Assembly's production schedule to align with strong customer demand."

By 2026, GM's Flint Assembly plant had built its 16 millionth vehicle.

The contrasting production schedules between Factory ZERO and Flint Assembly could require suppliers to adjust their own manufacturing capacity and material sourcing strategies. Suppliers focused on battery systems, electric motors and EV-specific components may face reduced order volumes, while those providing traditional internal combustion engine parts could see increased demand.

Broader supply chain implications across the sector

GM recorded a US6bn charge to close some EV investments in January2026. In its assumptions for 2026, announced within its 2025 Earnings, GM expected EV losses to improve by US1bn to US$1.5bn from "right-sizing EV capacity" and significantly lowering volume. This capacity adjustment could require renegotiating supplier contracts and reconfiguring material procurement networks.

Carmakers across the board have recorded write-downs of billions for EV related production with brands including Ford, Stellantis and Porsche. Under US President Donald Trump, major changes have been made to the EV landscape in the US.

President Trump vows to "eliminate the electric vehicle mandate" in his Executive Order titled "Unleashing American Energy."

The New Clean Vehicle Credit, Previously-Owned Clean Vehicle Credit and Qualified Commercial Clean Vehicle Credit measures all expired in September 2025, which offered US EV buyers an incentive to switch to electric vehicles.

EV makers in the US also face steep competition from Chinese brands, tariffs and global geopolitical turmoil, which can negatively influence supply chains.

These external factors compound the challenges facing both manufacturers and their supplier networks as they navigate shifting material requirements and production priorities.