Problems · NHTSA complaints
2004 Hummer H2 problems
Owners filed 59 complaints about the 2004 Hummer H2 with NHTSA between Jul 2004 and Feb 2026. The most-cited component is electrical system (14).
Complaints
59
Filed with NHTSA
Crashes
6
Reported by owners
Fires
1
Reported by owners
Injuries
5
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Electrical system14
- Visibility10
- Service brakes8
- Service brakes, hydraulic6
- Steering6
- Suspension3
- Air bags3
- Visibility/wiper3
- Structure3
- Engine2
- Electronic stability control (esc)2
- Power train2
- Seat belts1
- Tires1
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 7, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
2
4
3
6
4
2
10
4
3
2
3
0
4
2
3
3
0
1
2
0
0
0
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2004 | 2 |
| 2005 | 4 |
| 2006 | 3 |
| 2007 | 6 |
| 2008 | 4 |
| 2009 | 2 |
| 2010 | 10 |
| 2011 | 4 |
| 2012 | 3 |
| 2013 | 2 |
| 2014 | 3 |
| 2015 | 0 |
| 2016 | 4 |
| 2017 | 2 |
| 2018 | 3 |
| 2019 | 3 |
| 2020 | 0 |
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 0 |
| 2024 | 0 |
| 2025 | 0 |
| 2026 | 1 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Electrical system
14 reports1 fire
“Odometer Fraud. The contact purchased a 2004 Hummer H2. The contact discovered a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of purchase, the vehicle mileage was 200,000. It was later discovered that the mileage on the Title was 210,000. Additionally, the contact stated she felt pressured to purchase the vehicle, signed the contract, and was unable to recoup the funds.”
Visibility
10 reports1 crash
“TL* THE CONTACT OWNS A 2004 HUMMER H2. THE CONTACT STATED THAT THE WIPER MOTOR FOR THE FRONT WINDSHIELD BECAME INOPERABLE WHILE THE CONTACT WAS DRIVING IN INCLEMENT WEATHER, CAUSING THE CONTACT TO LOSS CONTROL OF THE VEHICLE AND CRASH INTO A GUARD RAIL. THE DEALER AND MANUFACTURER WERE NOTIFIED OF THE FAILURE, BUT DENIED ANY ASSISTANCE WITH REPAIRS TO THE VEHICLE. THE VEHICLE WAS NOT REPAIRED. THERE WERE NO INJURIES. A POLICE REPORT WAS NOT FILED. THE FAILURE MILEAGE WAS 70,000 AND THE CURRENT MILEAGE WAS 80,000.”
Service brakes
8 reports1 fire
“TL* THE CONTACT OWNS A 2004 HUMMER H2. WHILE DRIVING APPROXIMATELY 25 MPH, THE BRAKE PEDAL WAS DEPRESSED AND TRAVELED TO THE FLOORBOARD. THE STOPPING DISTANCE WAS EXTENDED. WHILE EXAMINING THE VEHICLE, THE CONTACT NOTICED BRAKE FLUID LEAKING UNDER THE SUBFRAME. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOTIFIED. THE LOCAL DEALER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 160,000.”
Service brakes, hydraulic
6 reports2 crashes2 related recalls
“TL* THE CONTACT OWNS A 2004 HUMMER H2. THE CONTACT STATED THAT THE VEHICLE WAS EQUIPPED TO ACCOMMODATE TRAILER BRAKES BUT THE TRAILER BRAKES WOULD NOT ENGAGE AND CAUSED THE OFFROAD LIGHT TO ILLUMINATE. THE VEHICLE WAS NOT TAKEN TO THE DEALER TO BE DIAGNOSED OR REPAIRED. THE VIN WAS NOT AVAILABLE. THE FAILURE AND THE CURRENT MILEAGE WAS 76,000.”
Steering
6 reports2 crashes1 related recall
“I WAS DRIVING MY 2004 H2 HUMMER. I WAS ON A DEEP SLOPE HILL. I WAS BACKING UP AND I HIT A 500 SERIES MERCEDEZ ON HIS LEFT BUMPER FROM LEFT REAR BUMPER. IMMEDIATELY AFTER I HIT, I STARTED TO SHIFT THE GEAR SO THAT I COULD STOP THE CAR TO GET OUT TO SEE WHAT HAPPENED. AT THIS POINT, THE HUMMER STARTED TO TRAVEL AT VERY FAST SPEED DOWN THE STREET IN THE SAME PATTERN THAT I HAD ORIGINALLY DRIVEN UP. I TRIED TO APPLY THE BRAKES, BRAKES DID NOT WORK. I TRIED TO STEER, STEERING WAS IN A LOCK POSITION. I HIT A PEDESTRIAN HARD AND MY CAR LANDED IN MY NEIGHBOR'S HOUSE. WHEN I HIT THE HOUSE, THE 2 FRONT WHEELS BECAME DETACHED FROM THE CAR. THE PEDESTRIAN THAT I HIT HAS INCURRED MANY SERIOUS DAMAGES. I HAD 1 ENGINEERING COMPANY LOOK AT THE CAR BACK IN 2004 AFTER THE ACCIDENT AND THEY SAID THEY COULD NOT FIND ANYTHING WRONG. WHEN I LOOK NOW, I'VE HEARD OF MANY CASES WHERE SIMILAR INCIDENTS HAVE OCCURRED DUE TO BRAKES. I AM CURRENTLY IN COURT FOR ANOTHER 1 WEEK AS THIS PEDESTRIAN IS NOW SUING ME. I PLEAD TO ALL H2 HUMMER OWNERS TO CONTRIBUTE ANY INFORMATION THAT THEY MAY HAVE ABOUT OTHER HUMMER OWNERS OR THEIR OWN EXPERIENCE. YOUR CONTRIBUTION TO THIS MATTER IS HIGHLY APPRECIATED. *TR”
Suspension
3 reports1 crash
“The contact owns a 2004 Hummer H2.The contact stated while driving at 35MPH, the contact stated the vehicle loss of control and forward momentum to the vehicle which caused the vehicle stalled and loss motive power. The contact who is a mechanic inspected the vehicle and notice that front differential carrier bolt had snapped was detached from the frame and connection to the engine. The vehicle was towed to the contact residence then towed later to a local dealer who inspected the vehicle diagnosed the failure the same as the contact that front differential carrier bolt was damaged and to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was at approximately 100,000. Consumer stated component that failed is the front differential to front differential carrier connection.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 7, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.