What breaks most · 2002 to 2006 model years
Chevrolet TrailBlazer Extended 370 problems by year
Owners have filed 288 safety complaints with NHTSA about the Chevrolet TrailBlazer Extended 370 across model years 2002 to 2006. One year stands out: 2005 for electrical system complaints. The quietest years are 2002 and 2003.
- Years to check closely: 2005
- Fewest complaints: 2002, 2003
- Complaints on file
- 2882002 to 2006, all trims
- Worst year
- 2005237 complaints
- Crashes reported
- 94 fires · 11 injuries · 0 deaths
- Typical failure mileage
- 73kMedian where owners gave mileage
- Recall campaigns
- 0Across 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 |
|---|---|---|---|---|
| 6 | 1 | 0 | Electrical system (2) | |
| 14 | 0 | 0 | Electrical system (6) | |
| 15 | 1 | 0 | Electrical system (6) | |
| 237 | 7 | 0 | Electrical system (101) | |
| 16 | 0 | 0 | Electrical system (5) |
What fails on the 2005 Chevrolet TrailBlazer Extended 370
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| Electrical systemAlternators, starters and ignition | 43% |
101 | 1 | Shop electrical system parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| Fuel systemFuel pumps and injectors | 28% |
67 | 1 | Shop fuel system parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| Fuel System, Other | 7% |
16 | 0 | — |
| Exterior lightingHeadlights, tail lights and bulbs | 6% |
15 | 0 | Shop exterior lighting parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| Fuel systemFuel pumps and injectors | 5% |
11 | 0 | Shop fuel system parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| Engine and coolingRadiators, thermostats and cooling | 4% |
10 | 0 | Shop engine and cooling parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| VisibilityMirrors and glass | 4% |
9 | 0 | Shop visibility parts for the 2005 Chevrolet TrailBlazer Extended 370 |
| Speed control and throttleThrottle and pedal sensors | 3% |
8 | 0 | Shop speed control and throttle parts for the 2005 Chevrolet TrailBlazer Extended 370 |
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.
-
Our 2005 chevy trailblazer speedometer stopped working. This has happened on many of these vehicles. It is a very expensive fix and it's a danger to drivers not knowing how fast they are traveling.
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 Chevrolet TrailBlazer Extended 370 years have the most problems?
By NHTSA complaint volume, 2005 carries the most filings on the Chevrolet TrailBlazer Extended 370. The 2005 alone has 237 complaints, led by electrical system.
What is the most common Chevrolet TrailBlazer Extended 370 problem?
On the 2005 model year, the most-reported component is electrical system with 101 complaints. The table above lists the top components for every year.
At what mileage do Chevrolet TrailBlazer Extended 370 problems start?
The median mileage at failure across all Chevrolet TrailBlazer Extended 370 complaints that include mileage is about 73,000 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.