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
01 —By component

Complaints by component

One complaint can cite several components
  1. Electrical system14
  2. Visibility10
  3. Service brakes8
  4. Service brakes, hydraulic6
  5. Steering6
  6. Suspension3
  7. Air bags3
  8. Visibility/wiper3
  9. Structure3
  10. Engine2
  11. Electronic stability control (esc)2
  12. Power train2
  13. Seat belts1
  14. 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
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20042
20054
20063
20076
20084
20092
201010
20114
20123
20132
20143
20150
20164
20172
20183
20193
20200
20211
20222
20230
20240
20250
20261

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.

03 —Owner reports

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.”
Owner complaint to NHTSAFiled Feb 10, 2026Electrical systemODI 11717047

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.”
Owner complaint to NHTSAFiled Dec 14, 2011VisibilityCrash reportedODI 10439872

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.”
Owner complaint to NHTSAFiled Jul 16, 2019Service brakesODI 11232360

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.”
Owner complaint to NHTSAFiled Aug 26, 2011Service brakes, hydraulicODI 10421616

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”
Owner complaint to NHTSAFiled Dec 5, 2007Steering, Service brakes, hydraulicCrash reportedODI 10210958

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.”
Owner complaint to NHTSAFiled Sep 16, 2021SuspensionODI 11433225
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.