2005 Chevrolet Trailblazer Ext 370 problems & reliability
237 owner complaints filed with NHTSA for the 2005 Chevrolet Trailblazer Ext 370. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
7 complaints report injuries (9 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Electrical System | 101 | 43% |
| Fuel System, Gasoline | 67 | 28% |
| Fuel System, Other | 16 | 7% |
| Exterior Lighting | 15 | 6% |
| Fuel/propulsion System | 11 | 5% |
| Engine and Engine Cooling | 10 | 4% |
| Visibility | 9 | 4% |
| Vehicle Speed Control | 8 | 3% |
| Air Bags | 7 | 3% |
| Structure | 6 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Common symptoms owners describe
Keyword analysis of complaint narratives; one complaint can describe several symptoms.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 70,000 miles (middle 50% between 49,848 and 85,850 miles), based on 200 complaints that included mileage.
Complaints by incident year
What owners report
“The whole instrument cluster does not work anymore, does not let me know how fast I'm going or how much fuel I have, oil pressure gauge doesn't work, temperature gauge doesn't work... Why hasn't this been recalled? This is very dangerous, considering I have 4 kids that are constantly in the car with me and I have no…”
Fuel/propulsion System · filed Oct 12, 2018
“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…”
Exterior Lighting · filed Jun 8, 2018
“I bought 2005 chevrolet trailblazer and the fuel gauge is defective. It is crazy to hear beep sounding all the time telling me the gauge is empty when I know for sure is not. I wish it could be fixed, because I have many others things in my plate that need to worry, I really don't need another one.”
Fuel/propulsion System · filed Oct 24, 2017
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Fuel level gauge system failure
Preliminary Evaluation PE11014 · opened Apr 25, 2011 · closed Sep 23, 2011
- Fuel Level Gauge System Failure
Defect Petition DP10001 · opened Jan 7, 2010 · closed May 23, 2011
Technical service bulletins
133 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2005 Chevrolet Trailblazer Ext 370. The 10 most recent:
This PI communicates the requirement to provide a pico file to receive diagnostic assistance from TAC.
PIP5601C · Service Bulletin/Repair Instructions · issued Jul 18, 2025
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
PIT5074R · Service Bulletin/Repair Instructions · issued May 30, 2025
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
PIT5074R · Service Bulletin/Repair Instructions · issued May 30, 2025
This Preliminary Information communication provides information to the technician about the use of J-35616-64B and Mini 50 terminal test probe, replacement terminals, and terminated leads.
PIT5074R · Service Bulletin/Repair Instructions · issued May 30, 2025
This service bulletin provides information for dealers/technicians on When and How to Submit a Field Product Report (FPR) (U.S. and Canada Dealers Only).
02-00-89-002X · Service Bulletin/Repair Instructions · issued Sep 9, 2024
This Preliminary Information communication provides information to the technician about changing the tire and wheel size on vehicles. General Motors will only support a tire calibration for tires that have been sized…
PIT3271P · Service Bulletin/Repair Instructions · issued Sep 6, 2024
Vehicle Wide Programming (VWP) is a new process to update software on GM Vehicles. It provides the ability via a single selection within Techline Connect to first identify which modules need updating and then proceed to…
General Communication · Service Campaign · issued Aug 26, 2024
This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
01-06-01-011P · Service Bulletin/Repair Instructions · issued Aug 5, 2024
GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This…
24-NA-141 · Service Bulletin/Repair Instructions · issued Jul 24, 2024
This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how…
16-NA-383 · Service Bulletin/Repair Instructions · issued Jun 28, 2024
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
No NHTSA recall campaigns name the 2005 Chevrolet Trailblazer Ext 370 in our current data. Recalls may apply only to certain VIN ranges — always confirm with a VIN check.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2005 Chevrolet Trailblazer Ext 370?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 70,000 miles — budget accordingly if the car is approaching that mileage.