"How reliable is the 2004 Hummer H2?"

"Based on 74 NHTSA complaints, the 2004 Hummer H2 has a median complaint mileage of 70500 miles. The most common issue is ELECTRICAL SYSTEM."

"What are common problems with the 2004 Hummer H2?"

"The most frequently reported component in NHTSA complaints for the 2004 Hummer H2 is ELECTRICAL SYSTEM, accounting for a significant portion of the 74 total complaints filed."

2004 Hummer H2: Reliability Data

Source: NHTSA — 74 complaints

Total Complaints

70,500mi

Median Mileage

ELECTRICAL SYSTEM

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

42,600 25th Percentile

70,500 Median Mileage

111,644 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ELECTRICAL SYSTEM

SERVICE BRAKES

SERVICE BRAKES, HYDRAULIC

VISIBILITY

AIR BAGS

VISIBILITY/WIPER

STEERING

VISIBILITY:WINDSHIELD WIPER/WASHER:MOTOR

ENGINE

ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"FRONT WHEEL LINKAGE FAILURE, WHEEL FELL OFF. MY BROTHER AND I NEARLY DIED TODAY FROM AN ACCIDENT IN MY MOTHERS H2. WE HAD JUST LEFT A FRIENDS HOUSE AND WERE TRAVELING AT ABOUT 35 MPH WHEN ALL OF A SUDDEN IT SEEMED THAT THE FRONT DRIVER SIDE WHEEL BROKE FREE. THE H2 VIOLENTLY SWERVED TO THE LEFT AND..."

"WHILE DRIVING 35 MPH THE STEERING KNUCKLE FRACTURED WITHOUT WARNING. AS A RESULT THE FRONT DRIVER SIDE WHEEL SEPARATED FROM THE VEHICLE. THE VEHICLE HAD TO BE TOWED TO THE NEAREST DEALER. PLEASE PROVIDE ADDITIONAL INFORMATION. *JB"

"WHILE DRIVING 10 MPH VEHICLE STALLED WITHOUT WARNING. DRIVER TRIED TO RESTART THE VEHICLE AND WAS ABLE TO DO SO. VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION, AND MECHANIC DETERMINED THAT THE IGNITION SWITCH NEEDED TO BE REPLACED, AND REPLACED IT. *AK"

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28