Trending Problems

A few problems that keep popping up. There's plenty more where that came from.

All Problems

What Owners Complain About the Most

Sorting out which topics, problems, and model years have the most overall complaints from owners on

What Breaks the Most view all topics

Years to Avoid view all years

The Least Reliable Hummer Models

Some models just can't seem to get out of their own way. We've created a list of the least reliable GMC models using data such as complaint volume, average cost of repairs, age of the car when it breaks down, and recall frequency.

All Models

Key Numbers

  1. 4 models

    Each with their own trim levels, bodystyles, and special blend of headaches.

  2. 4 generations

    A group of years for a specific model with the same design, features, and problems.

  3. 8 model years

    Grouping all models by their year can reveal some baddies.

  4. 162 complaints

    Running tally of owner grievances filed to

  5. 2,303 service bulletins

    Documenting the process of troubleshooting common problems.

  6. 17 recall campaigns

    Time-sensitive, free repairs for widespread safety problems.

Worst Generations

A generation is a group of model years where little, if any, changes were made. They tend to have the same problems and some generations have horrible reputations for reliability. Here's a handful you should avoid.

See All Generations

Recent Hummer News

There's a lot of news out there, but not all of it matters. We try to boil down it to the most important bits about things that actually help you with your car problem. Interested in getting these stories in an email? Signup for free email alerts over at

  1. Following 42 reports of fires, 3 reports of minor burns, and 1 giant headache for Hummer owners, GM announced a recall of nearly Hummer 200,000 vehicles.

    Although no accidents have been blamed on the problem, three people have been burned from fires that started with overheating modules. The defective module controls the speed of the heating and air conditioning blower motor, but the module can overheat when the blower motor is used for long periods of time.

    keep reading article "H3 and H3T Vehicles Catching on Fire, At Least 3 Injured"
  2. Doug DeMuro of bought a Hummer, and while it's "a ton of fun to drive" he also says it "the most unreliable piece of crap I've ever owned."

    Two specific issues he talks about 1) the infamous casting flaw in the 6.5-liter turbodiesel V8 and 2) a leaky central tire inflation system. The whole article is sort of like the Hummer itself – lots of fun and pretty crappy at the same time.…

    keep reading article "The Hummer is 'Possibly the Most Unreliable Piece of Crap I’ve Ever Owned'"

See More News

Having car trouble?

Tell Us What's Wrong With Your Vehicle

The best way to find out what's wrong with a vehicle is from the people who drive them. Not only do owner complaints help us rank vehicles by reliability, but they're often used to spark class-action lawsuits and warranty extensions. Plus, they're a great way to vent.

Add a complaint