What breaks most · 2003 to 2010 model years
Hummer H3 problems by year
Owners have filed 789 safety complaints with NHTSA about the Hummer H3 across model years 2003 to 2010. Three years stand out: 2006 for electrical system complaints, 2007 for electrical system complaints and 2008 for electrical system complaints. The quietest years are 2003.
- Years to check closely: 2006, 2007, 2008
- Fewest complaints: 2003
- Complaints on file
- 7892003 to 2010, all trims
- Worst year
- 2006361 complaints
- Crashes reported
- 2757 fires · 36 injuries · 1 deaths
- Typical failure mileage
- 79kMedian 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) | |
| 361 | 10 | 4 | Electrical system (96) | |
| 237 | 12 | 2 | Electrical system (76) | |
| 113 | 3 | 2 | Electrical system (34) | |
| 69 | 2 | 2 | Electrical system (34) | |
| 7 | 0 | 2 | Electrical system (4) |
What fails on the 2006 Hummer H3
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| Electrical systemAlternators, starters and ignition | 27% |
96 | 0 | Shop electrical system parts for the 2006 Hummer H3 |
| EngineEngine gaskets and seals | 14% |
52 | 0 | Shop engine parts for the 2006 Hummer H3 |
| Body and structureDoors, latches and body hardware | 10% |
36 | 0 | Shop body and structure parts for the 2006 Hummer H3 |
| Engine and coolingRadiators, thermostats and cooling | 10% |
35 | 0 | Shop engine and cooling parts for the 2006 Hummer H3 |
| VisibilityMirrors and glass | 9% |
31 | 0 | Shop all visibility parts, not filtered to this vehicle |
| Wipers and visibilityWiper motors and blades | 8% |
29 | 0 | Shop all wipers and visibility parts, not filtered to this vehicle |
| SuspensionStruts, springs and control arms | 8% |
29 | 0 | Shop suspension parts for the 2006 Hummer H3 |
| Unknown or other | 8% |
28 | 0 | — |
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.
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I go to stop traction control stabilizer goes out, i also have been having to buy new batteries and carry a jump box the car ignition doesn't go off all the way. You will come back to the car with the radio playing, drivers window stopped working, etc
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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.
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The pass lock in this vehicle is faulty. On numerous occasions, it has left me unable to start the vehicle, but if you wait 10 minutes each time, it will start again, but it happens all the time. I've seen numerous complaints online and GM needs to do something about it.
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 6, 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, 2008 carry the most filings on the Hummer H3. The 2006 alone has 361 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 96 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 79,000 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.