AI Damage2003 Chevrolet Trailblazer EXT 370: common problems
Owners of the 2003 Chevrolet Trailblazer EXT 370 filed 14 complaints with NHTSA, most often about electrical system and fuel/propulsion system. Details by component below, with sources.
Key figures
- Owner complaints
- 14
What fails most often
- 1 Electrical system 43% of all complaints
- 2 Fuel/propulsion system 21% of all complaints
- 3 Exterior lighting 14% of all complaints
- 4 Visibility 14% of all complaints
- 5 Electronic stability control 7% of all complaints
- 6 Engine 7% of all complaints
- 7 Engine and cooling 7% of all complaints
- 8 Structure 7% of all complaints
- Electrical system: 6 complaints (43% of all).
- Fuel/propulsion system: 3 complaints (21% of all).
- Exterior lighting: 2 complaints (14% of all).
- Visibility: 2 complaints (14% of all).
- Electronic stability control: 1 complaints (7% of all).
Symptoms owners describe
How many of the 14 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 6 | 0 | 0 |
| Fuel/propulsion system | 3 | 0 | 0 |
| Exterior lighting | 2 | 0 | 0 |
| Visibility | 2 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Engine | 1 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Structure | 1 | 0 | 0 |
| Tires | 1 | 0 | 0 |
| Wheels | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
The vapors cause the check engine light to illuminate. In nys this car will not pass the yearly inspection. Chevrolet has an extended coverage bulletin out but it only is for vehicles that have les than 150,000 miles on it or are not older than 15 years old. Whichever come first.
2003 chevrolet trailblazer 370 rear passenger side door electrical window control switch would not completely close window . Smelled like electrical wire burning.
Tl* the contact owns a 2003 chevrolet trailblazer ext 370. While driving at various speeds, there was an abnormal odor of fuel coming from the vehicle. The failure recurred continuously. The contact observed fuel dripping from the rear driver side of the vehicle.
The contact stated that while driving at various speeds, the vehicle surged forward and the rpms fluctuated without warning. In addition, the contact stated that an abnormal fuel odor emitted from the vehicle as the check fuel warning light illuminated.
My wife was driving the suv at highway speed when the front windshield wipers ceased to function during a heavy thunderstorm. She had to pull over because her visibility was obstructed to the point of not being able to operate the vehicle safely.
Tl* the contact owns a 2003 chevrolet trailblazer ext 370. While driving various speeds, the hatch door ajar light illuminated and failed to latch without warning. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The approximate failure mileage was 100,000.
Was driving to work on wednesday and a bluish cloud of smoke was trailing behind me. Arrived at work and let truck cool down after which I crawled underneath and with a mirror was able to locate the leaking rear main seal. This is a common problem with gm,s 5.3 liter engines.
After a long day of work, I returned to my parked vehicle to discover a totally flat front right tire, on closer examination it was noted that the tire had split on the outside seam. It was noted that the same condition of the tire splitting was visible on all three of the other tires on the vehicle.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 9,552 of 36,659 model years in the NHTSA data (top 26% most complained about).
On average one model year of the Trailblazer EXT 370 has 58 complaints (5 years in the data). This year has 14, below average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Fuel/propulsion system. Fuel smell, leaks, rough running, fuel-system codes.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Visibility. Wipers, mirrors, defrosters, cracked glass.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Chevrolet Trailblazer EXT 370?
Owner complaints to NHTSA most often mention: electrical system, fuel/propulsion system, exterior lighting. Total complaints: 14. The most frequent symptoms in complaint texts: headlights and tail lights (14%), warning lights, check engine (14%), windows, sunroof (14%).
How many service bulletins (TSB) were issued for the 2003 Chevrolet Trailblazer EXT 370?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2003 Chevrolet Trailblazer EXT 370 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2003 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.