What breaks most · 2003 to 2010 model years
Hummer H3 problems by year
Owners have filed 693 safety complaints with NHTSA about the Hummer H3 across model years 2003 to 2010. Two years stand out: 2006 for electrical system complaints and 2007 for electrical system complaints. The quietest years are 2003 and 2008.
- Years to check closely: 2006, 2007
- Fewest complaints: 2003, 2008
- Complaints on file
- 6932003 to 2010, all trims
- Worst year
- 2006329 complaints
- Crashes reported
- 2654 fires · 35 injuries · 1 deaths
- Typical failure mileage
- 74kMedian where owners gave mileage
- Recall campaigns
- 12Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 2 | 0 | 0 | Electrical system (2) | |
| 329 | 9 | 4 | Electrical system (91) | |
| 212 | 12 | 2 | Electrical system (71) | |
| 87 | 3 | 2 | Electrical system (25) | |
| 58 | 2 | 2 | Electrical system (29) | |
| 5 | 0 | 2 | Electrical system (3) |
What fails on the 2006 Hummer H3
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| Electrical systemAlternators, starters and ignition | 28% |
91 | 0 | Shop electrical system parts for the 2006 Hummer H3 |
| EngineEngine gaskets and seals | 14% |
47 | 0 | Shop engine parts for the 2006 Hummer H3 |
| Engine and coolingRadiators, thermostats and cooling | 10% |
34 | 0 | Shop engine and cooling parts for the 2006 Hummer H3 |
| Body and structureDoors, latches and body hardware | 10% |
33 | 0 | Shop body and structure parts for the 2006 Hummer H3 |
| VisibilityMirrors and glass | 9% |
29 | 0 | Shop all visibility parts, not filtered to this vehicle |
| Wipers and visibilityWiper motors and blades | 9% |
29 | 0 | Shop all wipers and visibility parts, not filtered to this vehicle |
| Unknown or other | 6% |
21 | 0 | — |
| SuspensionStruts, springs and control arms | 6% |
20 | 0 | Shop suspension parts for the 2006 Hummer H3 |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
-
The padlock system that the car has it prevents the car to start and leaves you stopped for 10 minutes. It's been doing it lately more in the morning or when the car hasn't been moved in awhile. The security icon in the dashboard blinks when the passlock security enables and that leaves the car without starting.
-
Vehicle won't start. The passlock prevents the vehicle from starting. The car alarm will start while i'm outside the vehicle and then the vehicle won't start. I replaced the battery but the passlock still makes the alarm go off while its locked in the driveway.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 30, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which Hummer H3 years have the most problems?
By NHTSA complaint volume, 2006, 2007 carry the most filings on the Hummer H3. The 2006 alone has 329 complaints, led by electrical system.
What is the most common Hummer H3 problem?
On the 2006 model year, the most-reported component is electrical system with 91 complaints. The table above lists the top components for every year.
At what mileage do Hummer H3 problems start?
The median mileage at failure across all Hummer H3 complaints that include mileage is about 74,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.