2002-2026 model years · 140+ owner reports · Updated September 2026
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According to Au7o's analysis of 140+ owner reports, the 2002-2026 Chevrolet TrailBlazer has 23 documented known issues, with 5 rated critical. The most serious are Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135 ($150-$700 repair), TrailBlazer Headlamp Driver Module Failure — Safety Recall 15V519000, Driver's Door Master Power Window Switch Module Fire — Recall 14V404000 ($0-$0 repair), Power Steering Hose Fracture — Loss of Assist and Fire Risk (Recall 05V455000) ($0-$600 repair) and Windshield Wiper Module Water Intrusion — Wipers Fail or Run On (Recall 04V046000) ($0-$400 repair). The most commonly reported issue is Turbocharger Oil Leak and Failure with 140 owner reports. Across all issues with published estimates, repair costs range from $40 to $3,500. DIY maintenance guides at au7o.io.
BACK OVER PREVENTION: SENSING SYSTEM: CAMERA
General Motors, LLC is recalling certain 2024-2025 Buick Envista, 2024-2026 Buick Encore GX, Chevrolet Trailblazer, and 2025 Chevrolet Trax vehicles. The rearview camera screen may display a distorted or blank image.
EQUIPMENT:MECHANICAL:ACCESSORY SCISSOR/SCREW/BOTTLE JACK/LIFT:STAND
General Motors, LLC. (GM) is recalling certain 2020-2022 Buick Encore GX and 2021-2022 Chevrolet Trailblazer vehicles. The emergency jack, if not positioned as directed in the vehicle owner's manual, can fracture while in use.
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
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According to Au7o's analysis of 140+ owner reports, the 2002-2026 Chevrolet TrailBlazer has 23 documented issues. The most frequently reported are: Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135, TrailBlazer Headlamp Driver Module Failure — Safety Recall 15V519000, Driver's Door Master Power Window Switch Module Fire — Recall 14V404000. Of these, 5 are rated critical and should be addressed promptly.
The 2002-2026 Chevrolet TrailBlazer has 23 known issues documented across 140+ owner reports. 5 issues are rated critical: Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135 and TrailBlazer Headlamp Driver Module Failure — Safety Recall 15V519000 and Driver's Door Master Power Window Switch Module Fire — Recall 14V404000 and Power Steering Hose Fracture — Loss of Assist and Fire Risk (Recall 05V455000) and Windshield Wiper Module Water Intrusion — Wipers Fail or Run On (Recall 04V046000). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Chevrolet TrailBlazer issues range from $0 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135, typically costs $150-$700 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Reliability varies across model years of the Chevrolet TrailBlazer. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2002-2026 Chevrolet TrailBlazer with 23 documented issues documented across 140+ owner reports.
The GMT360 TrailBlazer uses a drive-by-wire throttle actuator control system with dual redundant sensors in both the throttle body and the accelerator pedal. When the two throttle position signals disagree the PCM sets P2135 and drops the truck into Reduced Engine Power limp mode… Repairs typically run $150-$700. Severity: high.
Certain Chevrolet TrailBlazer SUVs are covered by GM safety recall 15V519000. The defect is in the headlamp driver module (HDM), the electronic module that drives the headlamp circuit: it can overheat and fail. Once it does, the TrailBlazer's headlamps and daytime running lights… Severity: high.
Water running down the door glass enters the driver's door master power window switch module, corroding the circuit board and shorting the circuit. The short overheats and can melt the module, producing odor, smoke, or an actual fire — and it can happen while the vehicle is parke… Repairs typically run $0-$0. Severity: high.
On affected GMT360 TrailBlazers the power steering hose can fracture under extreme steering maneuvers. Losing pressurized fluid means loss of power steering assist and, because the hydraulic system on these trucks also supports brake assist, reduced brake boost as well. Worse, fl… Repairs typically run $0-$600. Severity: high.
Water can enter the windshield wiper module on early GMT360 TrailBlazers and cause a short circuit or corrosion. The result is wipers that stop working, run when not commanded, or fail at exactly the moment they are needed in heavy rain — a direct loss-of-visibility hazard. GM re… Repairs typically run $0-$400. Severity: high.
The 1.2L and 1.3L turbocharged three-cylinder engines in the Trailblazer can develop turbo oil seal leaks, causing oil consumption and blue smoke on startup. The turbo oil feed and return lines are also prone to seepage. In severe cases, the turbo can fail completely. Repairs typically run $300-$2,200. Severity: medium.
The TrailBlazer uses an electronically controlled viscous fan clutch that fails, causing overheating in traffic or when towing. A failed fan clutch can also cause excessive fan engagement, creating a loud roaring noise and reduced fuel economy. Repairs typically run $300-$700. Severity: medium.
The 4.2L Atlas inline-six (LL8) used in the 2002-2009 GMT360 TrailBlazer has variable valve timing on the exhaust cam, controlled by an oil-fed camshaft position actuator solenoid mounted on the head behind the power steering pump. The solenoid screen clogs with oil varnish or th… Repairs typically run $150-$600. Severity: medium.
The Trailblazer with the 1.2L turbo and CVT automatic develops shudder during light acceleration and hesitation from stops. Some owners report a rubber-band feel typical of CVT calibration issues. Repairs typically run $0-$3,500. Severity: medium.
The small-displacement turbo engines in the Trailblazer can consume oil between changes, particularly the 1.2L 3-cylinder. Some owners report needing to add oil between the 7,500-mile change intervals. Repairs typically run $0-$2,000. Severity: medium.
The thermal front axle disconnect actuator fails, preventing the front differential from engaging when 4WD is selected. The actuator uses a heat-activated element that cracks and leaks fluid internally. When it fails, the transfer case shifts but the front axle does not engage, l… Repairs typically run $150-$400. Severity: medium.
On the body-on-frame GMT360 TrailBlazer, the instrument panel cluster uses six Switec XC5.168 stepper motors to drive the speedometer, tachometer, fuel, temperature, oil pressure and voltage needles. The motor gear teeth and solder joints degrade with heat cycling, so needles sti… Repairs typically run $100-$600. Severity: medium.
TrailBlazer EXT (and the sibling Envoy XL/XUV, plus the TrailBlazer SS) fitted with the rear air-leveling option carry air-assisted rear shocks/bags fed by a small electric compressor and a height sensor. The rubber air bags crack with age and leak, the compressor's piston/head f… Repairs typically run $250-$1,200. Severity: medium.
The GMT360 TrailBlazer uses a sealed front hub/bearing assembly with the ABS wheel speed sensor and tone ring built inside the unit — it cannot be serviced separately. When the bearing wears, the resulting play makes the internal tone ring wobble, so besides the growl and steerin… Repairs typically run $150-$600. Severity: medium.
The 4.2L Atlas I6 develops coolant leaks from the throttle body heater port, water pump weep hole, and thermostat housing. These are progressive leaks that worsen over time. Repairs typically run $200-$800. Severity: medium.
GM recalled 2021-2022 Chevrolet TrailBlazer vehicles because the emergency jack supplied with the vehicle can fracture while in use if it is not positioned exactly as the owner's manual directs. On a TrailBlazer, that jack is the tool an owner reaches for at the roadside to chang… Severity: low.
The cable-style window regulators in 2002-2009 TrailBlazers fail frequently. The plastic guide portion breaks, cables fray and wrap around the motor pulley, or the motor gears strip. Windows move slowly, make grinding/clicking noises, or become stuck. The front windows are most c… Repairs typically run $150-$500. Severity: low.
The Chevrolet Infotainment 3 system freezes, goes to a black screen, or reboots spontaneously. Bluetooth connectivity drops and Apple CarPlay/Android Auto connections are lost. The system may become unresponsive to touch input, requiring a manual reboot. Software stability issues… Repairs typically run $0-$800. Severity: low.
The small-displacement turbocharged 3-cylinder engines exhibit significant turbo lag and hesitation during initial acceleration from a stop, particularly when the A/C compressor is engaged. The ECM calibration is aggressive on fuel economy, which delays throttle response. The CVT… Repairs typically run $0-$150. Severity: low.
The fuel level sender card inside the in-tank fuel pump module on the 2002-2009 TrailBlazer builds up sulfur/silver-sulfide deposits from non-Top-Tier gasoline, so the wiper loses contact with the resistor card. The gauge then reads empty with a full tank, sticks near full, jumps… Repairs typically run $250-$800. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
