• (5.0) 4 reviews
  • MSRP: $112,952–$213,132
  • Body Style: Sport Utility
  • Combined MPG: N/A
  • Engine: 300-hp, 6.6-liter V-8 (diesel)
  • Drivetrain: 4x4
  • Seats: 4
2006 Hummer H1 Alpha

Our Take on the Latest Model 2006 Hummer H1 Alpha

What We Don't Like

  • Pending further review

Notable Features

  • Military-tested design
  • New turbo-diesel powertrain
  • 16-inch ground clearance
  • 30-inch fording depth
  • Crawl-speed operation

2006 Hummer H1 Alpha Reviews

Vehicle Overview
Even after the new and smaller Hummer H2 arrived in 2003, the original Hummer H1 continued to capture attention. The H1 is the most noticeable and forbidding of all the sport utility vehicles on sale. It's considered by many to be the toughest SUV, whether it's rumbling down a paved road or through the most demanding offroad trek. The manufacturer bills the H1 as "the world's premier offroad vehicle, rugged enough for Baja, refined enough for the country club." No H1s were produced in 2005.

After a yearlong hiatus, the 2006 H1 becomes the H1 Alpha. It's been extensively revised, with a new 6.6-liter turbo-diesel V-8 replacing the previous 6.5-liter engine. This improved power plant offers significantly more horsepower and torque and uses a new five-speed-automatic transmission.

The H1 Alpha also features freshened styling and revised braking and suspension components. It sits 2 inches higher than the 2004 H1, though ground clearance remains the same.

The H1 Alpha comes as an open-top model and a four-door hardtop. Due to its weight, the H1 Alpha falls into a heavier-duty category than other SUVs and doesn't have to meet federal safety, emissions and fuel-economy requirements.

While the Hummer appears massive, versatility is one of its hallmarks. The overpowering H1 Alpha is easy to spot from a distance, with an overall length of 184.5 inches, a 130-inch wheelbase and a 71.6-inch track (the width between the wheels). Two fuel tanks that hold 29.5 gallons and 22 gallons are installed. Run-flat tires on 17-inch aluminum wheels are standard. A restyled brush guard, new wheels and various badges differentiate the H1 Alpha from previous H1s.

The H1 Alpha's 16-inch ground clearance is more than twice that of most SUVs. A 72-degree approach angle and a 37.5-degree departure angle intensify its climbing capabilities.

Four seats are spread around the perimeter of the interior. A massive center tunnel separates occupants inside. Despite its militarylike external appearance, the H1 Alpha offers an appealing selection of comfort and convenience features, including leather seats and air conditioning.

Under the Hood
For 2006, the H1 Alpha's new 6.6-liter turbo-diesel V-8 features aluminum cylinder heads and direct fuel injection. It makes 300 hp and a burly 520 pounds-feet of torque — a significant increase over the previous 6.5-liter engine's 205 hp and 440 pounds-feet. A new five-speed-automatic transmission replaces the previous four-speed unit and offers a tow/haul mode. A permanently engaged four-wheel-drive system has a Low range and a locking differential. Hummer claims the H1 can climb 60 percent grades.

Antilock brakes are standard. The H1 falls into a heavy-duty vehicle category, so airbags aren't required.

Consumer Reviews


Average based on 4 reviews

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Very reliable vehicle

by Predator Motorsports from on September 21, 2017

Very functional, great for off road excursions. 465hp Duramax engine gets you where you need to go and where you're not supposed to be.

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2 Trims Available

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Wondering which configuration is right for you?
Our 2006 Hummer H1 Alpha trim comparison will help you decide.

Hummer H1 Alpha Articles

2006 Hummer H1 Alpha Safety Ratings

Crash-Test Reports


There are currently 2 recalls for this car.

Safety defects and recalls are relatively common. Stay informed and know what to do ahead of time.

Safety defects and recalls explained

Service & Repair

Estimated Service & Repair cost: $4,400 per year.

Save on maintenance costs and do your own repairs.

Warranty Coverage

What you should get in your warranty can be confusing. Make sure you are informed.

Learn More About Warranties

Warranties Explained


Often called a basic warranty or new-vehicle warranty, a bumper-to-bumper policy covers components like air conditioning, audio systems, vehicle sensors, fuel systems and major electrical components. Most policies exclude regular maintenance like fluid top offs and oil changes, but a few brands have separate free-maintenance provisions, and those that do offer them is slowly rising. Bumper-to-bumper warranties typically expire faster than powertrain warranties.


Don't be misled a 10-year or 100,000-mile powertrain warranty doesn't promise a decade of free repairs for your car. It typically covers just the engine and transmission, along with any other moving parts that lead to the wheels, like the driveshaft and constant velocity joints. Some automakers also bundle seat belts and airbags into their powertrain warranties. With a few exceptions, powertrain warranties don't cover regular maintenance like engine tuneups and tire rotations.

Roadside Assistance

Some automakers include roadside assistance with their bumper-to-bumper or powertrain warranties, while others have separate policies. These programs cover anything from flat-tire changes and locksmith services to jump-starts and towing. Few reimburse incidental costs like motel rooms (if you have to wait for repairs).

Free Scheduled Maintenance

Some automakers include free scheduled maintenance for items such as oil changes, air filters and tire rotations. Some include consumables including brake pads and windshield wipers; others do not. They are typically for the first couple of years of ownership of a new car.