Trailblazer (1st)
Verdict The 4.2L inline-six is the source of most complaints and 210 of the generation's 253 fires. The 5.3L V8 (EXT) and 6.0L V8 (SS) draw a fraction of its complaint rate, though both share the platform's other faults.
Data covers 2 NHTSA model names
Reliability Score
Complaints by Engine Code
LL8
4.2L 6-cylView details
Complaint Breakdown
Chevrolet Trailblazer Unidentified Engine
View details
Complaint Breakdown
LH6
5.3L 8-cylView details
Complaint Breakdown
LFC/LS2
6.0L 8-cylView details
Complaint Breakdown
Show 13 additional engine variants with limited data
L43
2.2LView details
Complaint Breakdown
LY7
3.6L 6-cylView details
Complaint Breakdown
L65
6.5L 8-cyl TurboView details
Complaint Breakdown
LC9
5.3L 8-cylView details
Complaint Breakdown
L33
5.3L 8-cylView details
Complaint Breakdown
LFX - SIDI, VVT, E85 MAX, Aluminum
3.6L 6-cylView details
Complaint Breakdown
L59
5.3L 8-cylView details
Complaint Breakdown
L34
2.0L 4-cylView details
Complaint Breakdown
LAX
2.4L 4-cylView details
Complaint Breakdown
LZ9
3.9L 6-cylView details
Complaint Breakdown
3.8-V6-Gas
3.8L 6-cylView details
Complaint Breakdown
LNJ
3.4L 6-cylView details
Complaint Breakdown
LLY
6.6L 8-cyl TurboView details
Complaint Breakdown
Reliability Overview
The 1st-gen Chevrolet Trailblazer logged 7,922 NHTSA complaints across eight model years, with 253 fires, 29 deaths, and 26 recall campaigns. The GMT-360 platform also underpinned the GMC Envoy, Buick Rainier, Saab 9-7x, and Isuzu Ascender, so the failure patterns documented here apply to a wider used market than the Chevy badge alone suggests.
Most of that history traces back to one engine. The Atlas 4.2L inline-six (LL8) generated 5,704 of the 7,922 complaints, or 72% of the total, with 210 fires and 9 deaths in NHTSA's data. The dominant story on the LL8 is not internal mechanical failure but a body harness, front power-distribution module, and underhood fire pattern that GM addressed across multiple recall campaigns. Cylinder head failures, valve seat erosion, and intake manifold gasket leaks show up in the engine bucket, but those internal items are dwarfed by the electrical and fuel-system entries the same trucks generate.
Across the platform, the top failure categories ranked by complaint count are electrical (2,713), fuel system (2,419), exterior (859), transmission (708), and engine (594). The electrical bucket is heavily driven by the body control module and driver's-door master power window switch, which corroded internally and overheated to the point of producing smoke or fire. The exterior category is largely the taillamp socket meltdown that deformed housings and in some cases ignited. The fuel-system bucket reflects multiple gas-tank and fuel-line campaigns, which is why NHTSA recorded 253 fires against this generation in total. Other recurring recall themes include windshield wiper module failures, transfer case range collar cracks, front lower control arm bracket fracture, and driver-side air bag inflator weld defects.
The V8 variants are less broken. The 5.3L LH6 (TrailBlazer EXT) shows 188 complaints and 6 fires, the 6.0L LFC/LS2 (TrailBlazer SS) shows 90 complaints and 3 fires. Their failure densities are roughly an order of magnitude below the inline-six. They ride on the same platform, so the chassis, brakes, suspension, body-control, and fuel-system failure modes still apply. A lower-mileage V8 truck is not a workaround for the platform's problems, only for the LL8-specific ones. A separate 1,917-complaint unidentified-engine bucket carries 33 fires and 16 deaths.
This generation is hard to recommend as primary transportation. Used pricing has dropped low enough that some buyers see it as an entry-level body-on-frame option, and the SS still has an enthusiast following on the V8 side. For anyone outside that narrow case, a contemporary Toyota 4Runner built through the same years carries materially better complaint and recall data, and it does not ship with a 253-fire generational tally.
Owner Complaints by System
Complaints owners filed with NHTSA about the Chevrolet Trailblazer, counted across every engine. A complaint can name more than one system.
Buyer's Guide
The 4.2L inline-six (engine code LL8) is the dominant complaint source, with 5,704 complaints against 188 for the 5.3L V8, and 210 of the generation's 253 fires sit on this engine code. The failure modes are expensive on a body-on-frame truck: cylinder head replacement runs into four figures of parts and labor, and the body-harness and power-distribution-module issues can be intermittent and slow to diagnose. The 5.3L V8 LH6 (TrailBlazer EXT) and 6.0L V8 LFC/LS2 (TrailBlazer SS) generate a fraction of the per-year complaint rate and are mechanically simpler to service. Engine choice matters more than model year on this generation.
Inspection priorities before buying any 1st-gen Trailblazer: Underhood wiring: pull the engine cover and inspect the body harness and front power-distribution module for heat damage or melted insulation. Exterior lighting: check the taillamp sockets for melting or charring at the back of the housings, not just the lenses. Front suspension: inspect the front lower control arm brackets and confirm they are intact and uncracked. Wipers: cycle through all speeds and the intermittent setting to confirm consistent operation. Transfer case: on 4WD models, confirm clean shifts between 2H, 4H, and 4L. Cooling and fuel: pressure-test the cooling system and pull a fuel pressure reading at idle. Verify all 26 recall campaigns are closed via NHTSA's VIN lookup at recalls.nhtsa.dot.gov, since several safety-critical items still have remediation parts available through GM dealers at no cost.
Used pricing is low enough that the math sometimes works if the buyer can do the maintenance themselves and accepts the failure patterns. For a buyer paying shop rates, the deferred maintenance cost on a high-mileage LL8 truck routinely exceeds the value of the vehicle within two repair cycles, and the fire-recall history is a hard argument against parking one in an attached garage overnight.
What to check on a used 2002-2009 Chevrolet Trailblazer
On a used 2002-2009 Chevrolet Trailblazer, the systems with the most NHTSA owner complaints are the electrical system (2,713), the fuel system (2,419) and the exterior lighting (859). Each one has an inspection step below, with counts as of 2026-10-12. A complaint is an owner report, not a confirmed defect, and counts rise with sales.
- Switch on every electrical item in turn: lights, windows, locks, wipers, climate fan, screen and power outlets.Costly repair. NHTSA has 2,713 owner complaints on the 2002-2009 Chevrolet Trailblazer about the electrical system.
- Let the engine idle for five minutes, walk around the car and smell for fuel.Safety. NHTSA has 2,419 owner complaints on the 2002-2009 Chevrolet Trailblazer about the fuel system, all engines combined.
- Check every exterior light, the wipers, the washers, the mirrors and the glass.Safety. NHTSA has 859 owner complaints on the 2002-2009 Chevrolet Trailblazer about the exterior lighting.
- Accelerate gently through every gear, then once at full throttle. Shift into Reverse and back to Drive.Costly repair. NHTSA has 708 owner complaints on the 2002-2009 Chevrolet Trailblazer about the transmission and drivetrain, all engines combined.
- Start the engine cold and listen for the first 30 seconds, then again at idle once it is warm.Costly repair. NHTSA has 594 owner complaints on the 2002-2009 Chevrolet Trailblazer about the engine, all engines combined.
Recalls (26)
General Motors LLC (GM) is recalling certain model year 2006-2007 Buick Rainier, Chevrolet Trailblazer and GMC Envoy vehicles, and 2006 GMC Envoy XL and Chevrolet Trailblazer EXT vehicles. Fluid may enter into the driver's door master power window switch module, causing corrosion that could result in a short in the circuit board, causing window switches to become inoperative. Previously, the affected vehicles may have had their master power window switch module treated with a protective coating, instead of having it replaced.
General Motors LLC (GM) is recalling certain model year 2007 Pontiac Grand Prix, 2006-2009 Buick LaCrosse, 2006-2007 Buick Rainier, Chevrolet Trailblazer, GMC Envoy, 2006 Chevrolet Trailblazer EXT, GMC Envoy XL, 2006-2008 Isuzu Ascender, and Saab 9-7x vehicles. In the affected vehicles, the headlamp driver module (HDM) may overheat and fail, causing the headlamps and daytime running lights to not illuminate.
General Motors LLC (GM) is recalling certain model year 2005-2007 SAAB 9-7x; 2006 Chevrolet Trailblazer EXT and GMC Envoy XL; and 2006-2007 Chevrolet Trailblazer, GMC Envoy, Buick Rainier and Isuzu Ascender vehicles. Fluid may enter the driver's door master power window switch module, causing 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 become inoperative. The short may also cause overheating, which could melt components of the door module, producing odor, smoke, or a fire.
General Motors (GM) is recalling certain model year 2005-2007 SAAB 9-7x; 2006 Chevrolet Trailblazer EXT and GMC Envoy XL; and 2006-2007 Chevrolet Trailblazer, GMC Envoy, Buick Rainier and Isuzu Ascender vehicles. Fluid may enter the driver's door module, causing 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 become inoperative. The short may also cause overheating, which could melt components of the door module, producing odor, smoke, or a fire.
General Motors (GM) is recalling certain model year 2006 Chevrolet Trailblazer EXT and GMC Envoy XL and 2006-2007 Chevrolet Trailblazer, GMC Envoy, Buick Rainier, SAAB 9-7x, and Isuzu Ascender vehicles, originally sold or currently registered in Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Wisconsin, and the District of Columbia. Fluid may enter the driver's door module, causing 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 become inoperative. The short may also cause overheating, which could melt components of the door module, producing odor, smoke, or a fire.
Show 21 older recalls
CERTAIN VEHICLES ORIGINALLY BUILT WITH CLOTH SEATS THAT WERE EQUIPPED WITH AN AUTOMATIC AIR BAG PASSENGER SENSING SYSTEM AND LATER REUPHOLSTERED WITH AFTERMARKET LEATHER SEAT COVER KITS ARE INVOLVED. TESTING HAS INDICATED THAT THE AFTERMARKET LEATHER SEAT COVERS CAN CAUSE THE PASSENGER SENSING SYSTEM TO MALFUNCTION.
CERTAIN POLI-AUTO COMBINATION HEADLAMP ASSEMBLIES, P/NOS. 11-728, 11-728D, 11-710, 11-419, 11-713, 11-703, 11-704, 11-708P, 11-735, 11-725, 11-726, 11-716 (P&C), 11-721-1, 11-733, 11-729, 11-730, AND 11-732, SOLD AS REPLACEMENT LAMPS FOR USE ON CERTAIN PASSENGER VEHICLES. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT."
CERTAIN TRUCKS AND SPORT UTILITY VEHICLES FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 110, "TIRE SELECTION AND RIMS." THESE VEHICLES WERE SHIPPED WITH TIRE AND LOADING INFORMATION LABELS LISTING AN INACCCURATE VEHICLE CAPACITY WEIGHT.
CERTAIN SPORT UTILITY VEHICLES HAVE A REAR SIDE CLOSURE LATCH THAT MAY NOT LATCH OR UNLATCH DUE TO CORROSION CAUSED BY ROAD SPLASH, SUCH AS WATER AND ROAD SALT. THESE VEHICLES WERE ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE FOLLOWING STATES: CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WEST VIRGINIA, WISCONSIN, AND THE DISTRICT OF COLUMBIA.
CERTAIN PASSENGER VEHICLES MAY HAVE BEEN BUILT WITH A POWER STEERING HOSE THAT IS NOT TO SPECIFICATION. UNDER EXTREME STEERING MANEUVERS, SUCH AS TURNING THE STEERING WHEEL FULLY TO THE LEFT OR RIGHT WHILE BRAKING, THE HOSE MAY FRACTURE AND LEAK FLUID.
ON CERTAIN TRUCKS AND SPORT UTILITY VEHICLES, THE DRIVER WISHING TO SIGNAL A TURN BY MOVING THE DIRECTIONAL SIGNAL LEVER, (UP OR DOWN) MAY CAUSE THE FRONT MARKER/TURN LIGHTS AND REAR TURN LIGHTS TO FLASH IN A MANNER SIMILAR TO HAZARD WARNING, RATHER THAN FLASHING ON THE DESIRED SIDE ONLY.
CERTAIN SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 212, 'WINDSHIELD MOUNTING.' THE WINDSHIELD URETHANE BEAD MAY NOT HAVE ADHERED TO THE BODY IN CERTAIN AREAS DURING THE CURE PROCESS.
ON CERTAIN SPORT UTILITY VEHICLES, VIBRATION AND HEAT MAY CAUSE THE TAIL LAMP/STOP LAMP BULB TO LOOSEN IN ITS SOCKET. IF THIS OCCURS, THE BULB MAY FLICKER AND EVENTUALLY BECOME INOPERATIVE.
CERTAIN LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES FAIL TO CONFORM TO FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 209, "SEAT BELT ASSEMBLIES." ONE OF THE TWO SENSORS IN THE DRIVER'S AND FRONT PASSENGER'S SEAT BELT RETRACTORS COULD BE INOPERATIVE. THE SEAT BELT RETRACTORS WILL LOCK WHEN THE BELT WEBBING IS EXTRACTED DURING A CRASH; HOWEVER, THE MECHANISM THAT LOCKS THE SEAT BELT RETRACTOR WHEN THE VEHICLE DECELERATES QUICKLY, SUCH AS HEAVY BRAKING, MAY NOT OPERATE AS INTENDED.
CERTAIN SPORT UTILITY VEHICLES HAVE WINDSHIELD WIPER SYSTEMS THAT WILL NOT TURN ON, CEASE OPERATION WHILE IN USE, FAIL TO TURN OFF/ON BY THEMSELVES (MOISTURE SENSITIVE WIPER SYSTEM), OR HAVE CONTINUOUS WINDSHIELD WASHER PUMP OPERATION BECAUSE THE PRESENCE OF WATER WITHIN THE WIPER MODULES CAN EITHER CAUSE A SHORT CIRCUIT OR CAN LEAD TO THE CORROSION OF COMPONENTS WITHIN THE MODULE.
CERTAIN MINIVANS, PASSENGER AND SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 225, "CHILD RESTRAINT ANCHORAGE SYSTEM." THE OWNER'S MANUAL DOES NOT EXPLAIN THE MEANING OF THE LOCATION SYMBOLS FOR THE CHILD RESTRAINT LOWER UNIVERSAL ANCHORAGE SYSTEM.
CERTAIN SPORT UTILITY VEHICLES WERE BUILT WITH A LEFT-FRONT BRAKE PIPE WITH A CIRCUMFERENTIAL SCORE AT A RANDOM LOCATION ALONG THE LENGTH OF THE PIPE AS THE RESULT OF THE MANUFACTURING PROCESS. IF THE BRAKE PIPE PARTIALLY OR FULLY FRACTURED, BRAKE PEDAL TRAVEL WOULD IMMEDIATELY INCREASE AND FRONT BRAKE PERFORMANCE WOULD BE REDUCED.
CERTAIN SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARDS NO. 101, "CONTROL LOCATION, IDENTIFICATION, AND ILLUMINATION" AND NO. 208, "OCCUPANT CRASH PROTECTION." THESE VEHICLES HAVE AN INTERMITTENT CONDITION DURING VEHICLE START-UP IN WHICH THE INSTRUMENT PANEL CLUSTER MAY NOT PROPERLY POWER UP, RESULTING IN MOST OF THE DISPLAYS, TELLTALE LIGHTS, AND FUNCTIONS (EXCEPT THE SERVICE ENGINE LIGHT, TURN SIGNAL INDICATORS, AND THE INSTRUMENT PANEL CLUSTER BACKLIGHTING) BEING INOPERATIVE.
CERTAIN SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 114, "THEFT PROTECTION." THESE VEHICLES ARE EQUIPPED WITH A MECHANICAL OVERRIDE THAT COULD ALLOW THE IGNITION KEY TO BE REMOVED WITH THE SHIFT LEVER IN A POSITION OTHER THAN PARK. IN ADDITION, THESE VEHICLES HAVE AN OVERRIDE THAT CAN ALLOW THE TRANSMISSION TO BE SHIFTED OUT OF PARK WITH THE IGNITION IN THE OFF POSITION.
ON CERTAIN MINI VANS, PASSENGER AND SPORT UTILITY VEHICLES, SOME OF THESE VEHICLES HAVE A DRIVER'S SIDE AIR BAG THAT MAY NOT DEPLOY AS DESIGNED. IN ADDITION, THE AIR BAG INFLATOR COULD RUPTURE.
CERTAIN SPORT UTILITY VEHICLES ARE MISSING WELDS ON THE REAR FLOOR PLAN.
ON CERTAIN SPORT UTILITY VEHICLES, A FUEL FILTER FITTING CAN BECOME DISCONNECTED. IF THIS WERE TO OCCUR WHILE ATTEMPTING TO START THE ENGINE, A NO-START CONDITION WOULD RESULT AND FUEL WOULD BE PUMPED OUT THE FUEL FILTER ONTO THE GROUND.
CERTAIN PASSENGER, MINI VANS, AND SPORT UTILITY VEHICLES HAVE AN AIR BAG INFLATOR ON THE DRIVER'S SIDE THAT COULD FRACTURE AT A WELD DURING A DEPLOYMENT.
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES EQUIPPED WITH 4-WHEEL DRIVE. THE CALIBRATION OF THE TRANSFER CASE CONTROL MODULE COULD CAUSE INSUFFICIENT HIGH SPEED GEAR ENGAGEMENT.
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES (4 WHEEL-DRIVE). SOME OF THESE VEHICLES WERE BUILT WITH A RANGE SHIFT COLLAR IN THE TRANSMISSION TRANSFER CASE THAT CONTAINS CRACKS.
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES. UNDER CERTAIN CIRCUMSTANCES THE FRONT LOWER CONTROL ARM BRACKETS MAY FRACTURE. THIS FRACTURE COULD RESULT IN SEPARATION OF THE FRONT LOWER CONTROL ARM FROM THE FRAME.
NHTSA Safety Ratings About NHTSA ratings
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Frequently Asked Questions
What are the most common 2002-2009 Chevrolet Trailblazer complaints?
Owners have filed 7,922 complaints with NHTSA about the 2002-2009 Chevrolet Trailblazer. The systems they name most often are the electrical system, the fuel system and the exterior.
Is the 2002-2009 Chevrolet Trailblazer a good used car?
That depends on the model year, the mileage and the maintenance history of the car in front of you. Owners have filed 7,922 complaints with NHTSA about the 2002-2009 Chevrolet Trailblazer. Check which systems they name most often and whether a recall is still open on that car.
How many NHTSA complaints does the 2002-2009 Chevrolet Trailblazer have?
NHTSA has 7,922 owner complaints on file for the 2002-2009 Chevrolet Trailblazer as of the latest data pull. A complaint is an owner's report, not a confirmed defect, and counts rise with sales.
What recalls affect the 2002-2009 Chevrolet Trailblazer?
NHTSA lists 26 recalls covering some 2002-2009 Chevrolet Trailblazer vehicles. Which ones apply depends on the VIN: enter it at nhtsa.gov/recalls to see the open campaigns on a specific car.
What should I check before buying a used Chevrolet Trailblazer?
Run the VIN through NHTSA's recall lookup and confirm every open recall has been done. Look hardest at the electrical system, the fuel system and the exterior, the systems owners complain about most. Ask for maintenance records, have an independent mechanic inspect the car and run a vehicle history report for prior accidents and title issues.
What are the NHTSA crash test ratings for the Trailblazer?
The 2009 Chevrolet Trailblazer received an overall N/A-star safety rating from NHTSA. Frontal crash: N/A stars. Side crash: N/A stars. Rollover: 4 stars (19.1% rollover probability). Electronic Stability Control: Standard. Forward Collision Warning: No. Lane Departure Warning: No. These ratings are based on standardized crash tests conducted by the National Highway Traffic Safety Administration.
Data from NHTSA federal complaints database. 7,922 complaints analyzed. Data confidence: high. Last updated: 2026-10-12.