Chevrolet Trailblazer EXT 370 Problems by Model Year
NHTSA recorded 288 consumer complaints across the 5 model years of the Chevrolet Trailblazer EXT 370 (2002–2006) that have at least 5 complaints. 2005 has the most, with 237. Across all years, the part named most often is electrical system (120 mentions). Pick a model year below to see its parts, mileage, recalls and service bulletins.
All Trailblazer EXT 370 model years
Years with fewer than 5 complaints are not listed. The score compares years of the same model, allowing for the era and for how long each year has collected complaints: 50 is a typical year, lower means fewer complaints. It is not adjusted for sales volume.
| Year | Complaints | Median mi | Recalls | TSBs | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|
| 2006 | 16 | 105,000 | 0 | 129 | — | Stable |
| 2005 | 237 | 70,000 | 0 | 129 | Not compared (before 2008) | Stable |
| 2004 | 15 | 96,250 | 0 | 82 | — | Stable |
| 2003 | 14 | 140,000 | 0 | 76 | — | Not enough data |
| 2002 | 6 | 120,000 | 0 | 64 | — | Not enough data |
Parts named most often, all years
Counts add up complaint mentions across the listed years. A complaint can name several parts.
- Electrical system120 39%
- Fuel system107 35%
- Exterior lighting24 7.9%
- Visibility (wipers, defrost, mirrors)17 5.6%
- Engine cooling13 4.3%
- Vehicle speed control8 2.6%
- Body and structure8 2.6%
- Engine8 2.6%
Example complaints
One per model year, chosen for length and detail. Personal details are removed. They are consumer reports, not findings.
2005: “I have 2005 Chevrolet trailblazer 4wd ext ls 4.2 liter. I noticed over past 3 years that I be at drive through for burgers and etc. The car would cut off. I did not think much of it at the time. It has gotten critically worse. It would cut off in middle of the highway, drive throughs and etc. During the past two years I have re the luster and over head dome light flicker. …”
NHTSA complaint #11100524, filed 2018-06, 81,000 miles2006: “While driving on a smooth hi-way (no vibrations) the low beam headlights went off. I switched to hi beams and pulled off the road at first opportunity. When I switched back to low beams and they worked perfectly. This has happened 4 times in the 11 years of ownership, twice in one week. Could never induce the problem.”
NHTSA complaint #10981630, filed 2017-05, 120,000 miles2004: “On about 6 occasions over the past couple weeks my sunroof has opened by itself. On each occasion it has happened after backing up and then putting it in drive. When it happens I try to stop it by pressing the close button but it doesn't do anything and continues to open fully and stops. After about 20-30 seconds I can close it.”
NHTSA complaint #10460797, filed 2012-06, 111,000 milesOther Chevrolet models
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About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Methodology