Who Builds Hummers? The Full Manufacturing History Explained

The Hummer name has passed through several different hands since the vehicle first appeared in military form decades ago. Today, two different companies have built vehicles under the Hummer badge — at very different points in history, using very different approaches. Here's how that story breaks down.

The Original Builder: AM General and the Military HMMWV

The Hummer traces its roots to AM General, a defense contractor based in South Bend, Indiana. In 1983, AM General won a U.S. Army contract to produce the High Mobility Multipurpose Wheeled Vehicle — better known as the HMMWV, or "Humvee." This was a military utility vehicle built for rugged terrain, not civilian roads.

After the Gulf War brought the Humvee widespread public attention, AM General launched a civilian version in 1992. That vehicle was sold simply as the Hummer (later called the H1). It was large, heavy, and expensive — essentially a street-legal version of the military platform, with some comfort upgrades.

AM General manufactured the H1 at its Mishawaka, Indiana plant. The vehicle was never designed to compete with mainstream SUVs. It was a niche product aimed at buyers who wanted the real thing, regardless of fuel costs or practicality.

General Motors Takes Over: H2 and H3 Production

In 1999, General Motors licensed the Hummer name from AM General and launched a more consumer-oriented lineup. GM's goal was to capture the brand's military-inspired image while selling vehicles at a broader price point.

🚙 Here's how the GM-era Hummer lineup broke down:

GM owned and marketed the brand. AM General continued to physically manufacture the H2 under contract, while GM built the smaller H3 at its own Louisiana plant on a modified truck platform shared with the Chevrolet Colorado.

The H2 used a body-on-frame architecture based on GM's heavy-duty truck platform. The H3 was significantly smaller and used a mid-size truck frame — a deliberate move to improve fuel economy and appeal to a wider audience.

The End of the GM-Era Hummer

GM discontinued the Hummer brand in 2010 as part of its post-bankruptcy restructuring. A proposed sale to a Chinese company fell through, and the brand went dormant. AM General continued military Humvee production, but civilian Hummer manufacturing stopped entirely.

The Relaunch: GMC Hummer EV

In 2020, General Motors revived the Hummer name — this time under the GMC sub-brand and built entirely around an electric powertrain. The GMC Hummer EV is a full-size electric pickup truck and SUV, with no connection to the original AM General design.

The Hummer EV is manufactured at GM's Factory ZERO in Detroit and Hamtramck, Michigan — a facility GM retooled specifically for electric vehicle production. This is a completely different vehicle from the original H1, H2, or H3 in almost every measurable way:

• Powertrain: Battery-electric, no combustion engine
• Platform: GM's Ultium battery architecture
• Body style: Available as both pickup truck and SUV
• Performance: Available in configurations producing up to 1,000 horsepower (GM's stated figure for the Edition 1 trim)
• Features: Crab Walk diagonal driving mode, Extract Mode air suspension, up to 350+ miles of estimated range depending on configuration

🔋 GM's Ultium platform is shared with other vehicles like the Cadillac Lyriq and Chevrolet Silverado EV, though each vehicle has its own specific engineering.

AM General Today

AM General still exists and still builds military vehicles — including updated Humvee variants and the newer Joint Light Tactical Vehicle under a different contract. The company has no involvement in the current GMC Hummer EV. The civilian and defense sides of the Hummer story separated entirely after the H2 ended production.

What "Hummer" Means Depends on the Era

The variables that define any specific Hummer depend heavily on when it was built and by whom:

• Pre-1999 H1: AM General product, military-derived, built in Indiana
• 2003–2009 H2: GM brand, AM General manufacturing, Indiana plant
• 2006–2010 H3: GM brand, GM manufacturing, Louisiana plant
• 2022–present GMC Hummer EV: GM brand, GM manufacturing, Michigan plant, fully electric

A buyer researching an older used H2 is looking at a vehicle from a different manufacturer relationship, platform, and era than someone researching the current GMC Hummer EV. The badge is the same; nearly everything else has changed.

The ownership experience — reliability history, parts availability, maintenance costs, insurance considerations — varies significantly across those generations. How those factors play out depends on the specific model year, trim, mileage, and where you're located.