AI Damage2004 Chevrolet Trailblazer EXT 370: common problems
Owners of the 2004 Chevrolet Trailblazer EXT 370 filed 15 complaints with NHTSA, most often about electrical system and fuel/propulsion system. Details by component below, with sources.
Key figures
- Owner complaints
- 15
- involving a crash
- 1
What fails most often
- 1 Electrical system 40% of all complaints
- 2 Fuel/propulsion system 20% of all complaints
- 3 Fuel system 20% of all complaints
- 4 Air bags 7% of all complaints
- 5 Engine and cooling 7% of all complaints
- 6 Exterior lighting 7% of all complaints
- 7 Seats 7% of all complaints
- 8 Service brakes 7% of all complaints
- Electrical system: 6 complaints (40% of all).
- Fuel/propulsion system: 3 complaints (20% of all).
- Fuel system: 3 complaints (20% of all).
- Air bags: 1 complaints (7% of all), 1 of them with a crash reported by the owner.
- Engine and cooling: 1 complaints (7% of all).
Symptoms owners describe
How many of the 15 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 |
| Fuel system | 3 | 0 | 0 |
| Air bags | 1 | 1 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Seats | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Visibility | 1 | 0 | 0 |
| Other | 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.
My son [xxx] was involved in a single car accident (hit a deer and ran off the road) in which our 2004 chevy trailblazer was totaled in a roll over and not one single airbag deployed in the accident. As a result of no airbag he smashed his forehead into the steering wheel leaving a 2 inch gash, cut to the bone.
Filler neck to gas tank leaking....dangerous !! Causes the check engine light to stay on....
Received a letter from gm regarding potential problem with fuel tank inlet valve. Took vehicle to dealer len stoler, inc in westminster md in december. Problem was diagnosed as a fuel tank inlet valve fracture. On dec 3rd 2015 fuel tank was replaced and inspection done.
While in a parking lot, the vehicle stalled without warning. The vehicle was towed to an independent dealer. The technician diagnosed that the fuel pump and fuel filter needed to be replaced the filler inlet was also cracked. The contact mentioned that the fuel pump, the fuel filter, and the hose were replaced.
Nhtsa recently posted a recall of the 2006-2009 chevy trailblazer for headlight issues due to a headlamp driver module (hdm) that is not operating correctly and can cause the low beam headlamps and daytime running lights to shut off.
The headlight plug has burned up twice on the driver side and it has been replaced. The electrical is seriously in need of a recall do to the back door speakers never working since we purchased the truck (which the dealer promised to fix) along with the rear a/c (which the dealer also promised to fix!
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.
Switches for the power window and heated driver's seat on driver's door panel stopped working. Heater for driver's seat turns on, on its own and cannot be controlled with the switch. While the heater for driver's seat is on, the instrument panel flickers.
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 9,288 of 36,659 model years in the NHTSA data (top 25% most complained about).
On average one model year of the Trailblazer EXT 370 has 58 complaints (5 years in the data). This year has 15, 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.
- Fuel system. Fuel smell, leaks, rough running, fuel-system codes.
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Chevrolet Trailblazer EXT 370?
Owner complaints to NHTSA most often mention: electrical system, fuel/propulsion system, fuel system. Total complaints: 15. The most frequent symptoms in complaint texts: A/C or heater (13%), headlights and tail lights (13%), warning lights, check engine (13%).
How many service bulletins (TSB) were issued for the 2004 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 2004 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 2004 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.