2006 Chevrolet Trailblazer Ext problems & reliability
189 owner complaints filed with NHTSA for the 2006 Chevrolet Trailblazer Ext, alongside 6 safety recall campaigns. 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.
1 complaint report injuries (4 injured).
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Fuel System, Gasoline | 102 | 54% |
| Electrical System | 41 | 22% |
| Fuel System, Other | 23 | 12% |
| Exterior Lighting | 11 | 6% |
| Structure | 9 | 5% |
| Visibility | 8 | 4% |
| Power Train | 6 | 3% |
| Fuel/propulsion System | 5 | 3% |
| Air Bags | 4 | 2% |
| Engine and Engine Cooling | 4 | 2% |
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 58,000 miles (middle 50% between 45,000 and 79,000 miles), based on 165 complaints that included mileage.
Complaints by incident year
What owners report
“On august 18, 2017, I leased-to-own a 2006 chevrolet trailblazer from action auto of tupelo, ms. Around the first week of october of 2018, I had lend said vehicle to my sister. She contacted me saying that the engine was making a knocking noise, and brought the vehicle back to me, where I inspected it while it was…”
Air Bags · filed Jun 11, 2019
“Takata recall if fluid, such as melted snow containing road salt, enters the driver's door module, it may cause corrosion that could result in a short in the circuit board. A short may cause the power door lock and power window switches to function intermittently or may stop working. The dealership cannot fix the…”
Unknown OR Other · filed May 12, 2017
“Headlights turn off while driving. Happens with regularity. Headlight relay defective. No replacement part available. Gm denies that a recall exists. *tr”
Exterior Lighting · filed Dec 8, 2016
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Federal defect investigations
- Loss of Headlights
Recall Query RQ17002 · opened Apr 24, 2017 · closed Mar 29, 2021
- Driver's Master Power Window Switch
Engineering Analysis EA12004 · opened Jun 11, 2012 · closed Jun 21, 2013 · led to recall 13V248000
- Driver's Master Power Window Switch
Preliminary Evaluation PE12003 · opened Feb 9, 2012 · closed Jun 11, 2012
- Fuel Level Gauge System Failure
Defect Petition DP10001 · opened Jan 7, 2010 · closed May 23, 2011
Technical service bulletins
169 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2006 Chevrolet Trailblazer Ext. 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
The 2006 Chevrolet Trailblazer Ext has 6 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
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 2006 Chevrolet Trailblazer Ext?
- · 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 58,000 miles — budget accordingly if the car is approaching that mileage.