Is the 2005 Chevrolet Trailblazer EXT 370 a bad year?
237 owner complaints to NHTSA. Engine and transmission complaints are in line with other Trailblazer EXT 370 years.
Keep it
Engine and transmission complaints for the 2005 Chevrolet Trailblazer EXT 370 are in line with other Trailblazer EXT 370 years. Electrical system and fuel system stand out for this year: see below.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2005 Trailblazer EXT 370 owners report, by mileage
Each system owners named in five or more complaints, with the mileage range where the middle half of those complaints were filed. Read at 74,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| Electrical systemSTANDS OUT | 101 (43%) | 55k–85k miles · around this mileage | 12-volt battery replacement $100–$400 · Starter motor replacement $350–$1,200 |
| Fuel systemSTANDS OUT | 94 (40%) | 50k–82k miles · around this mileage | Fuel pump replacement $220–$1,500 · Fuel injector replacement (one injector) $300–$1,200 |
| Exterior lighting | 15 (6%) | too few with a mileage | — |
| Visibility and wipers | 12 (5%) | too few with a mileage | — |
| Equipment | 10 (4%) | too few with a mileage | — |
| Engine | 8 (3%) | too few with a mileage | — |
| Speed control | 8 (3%) | too few with a mileage | — |
| Air bags | 7 (3%) | too few with a mileage | — |
| Body structure | 6 (3%) | too few with a mileage | — |
| Tires | 6 (3%) | too few with a mileage | — |
| Transmission and drivetrain | 5 (2%) | too few with a mileage | — |
Bills are typical US ranges from the sources named in the tool (J.D. Power, Kelley Blue Book, CarParts.com and others), printed only for systems that stand out or sit at or ahead of 74,000 miles. Not a quote.
What owners reported alongside their complaints
Of 237 complaints: 7 mention a crash · 1 mentions a fire · 7 report an injury.
No complaints in the last 12 months; the newest was filed in Dec 2019.
Counts of what owners wrote in their complaints, not verified by anyone.
Recalls for the 2005 Chevrolet Trailblazer EXT 370: 0
No recall campaign lists this model year.
A recall may cover only some cars of a model year; the campaign size counts every model and year it lists. Enter your VIN at nhtsa.gov/recalls: dealers fix open recalls free.
Service bulletins from Chevrolet: 76
Repair instructions Chevrolet sent its dealers for symptoms seen in the shop on the 2005 Chevrolet Trailblazer EXT 370. Ask a dealer or mechanic for a bulletin by its number.
Rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up
Possible location of an internal coolant leak from a specific cylinder head and location
Guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system
Proper way to install the pistons in an engine
NHTSA defect investigations: 2
Fuel level gauge system failure
Fuel Level Gauge System Failure
Every Chevrolet Trailblazer EXT 370 year
2002 · 2003 · 2004 · 2005 · 2006 · All Trailblazer EXT 370 years side by side
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Questions
Is the 2005 Chevrolet Trailblazer EXT 370 a bad year?
237 owner complaints to NHTSA. Engine and transmission complaints are in line with other Trailblazer EXT 370 years. At 74,000 miles the tool says: Keep it.
What are the most common problems with the 2005 Chevrolet Trailblazer EXT 370?
By owner complaints to NHTSA: electrical system (101), fuel system (94), exterior lighting (15), visibility and wipers (12), equipment (10).
How many recalls does the 2005 Chevrolet Trailblazer EXT 370 have?
No recall campaign lists this model year in NHTSA data. Check your VIN at nhtsa.gov/recalls to confirm.
Method: counts of unverified owner complaints filed with NHTSA, compared only with other years of the same model (sales volumes are unknown, so no failure rate is computed). A system stands out at 40+ complaints and at least twice the model's quiet (lower-quartile) year, or twice the share across every vehicle of that model year. The mileage range is the 25th to 75th percentile of the mileages owners reported. Data received by NHTSA through November 5, 2026. Repair prices are typical US ranges from named sources, not quotes. Not a diagnosis and not financial advice. PulsCar is not affiliated with NHTSA. Check this car at your own mileage.