What are the most common Chevrolet Trailblazer problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2009 Chevrolet Trailblazer has 13 documented issues. The most frequently reported are: Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135, Electric Fan Clutch Failure, 4.2L I6 Coolant Leak from Throttle Body and Water Pump. Of these, 1 is rated critical and should be addressed promptly.
Is the Chevrolet Trailblazer reliable?
The 2009 Chevrolet Trailblazer has 13 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135. 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.
How much does it cost to fix common Chevrolet Trailblazer problems?
Repair costs for known Chevrolet Trailblazer issues range from $40 to $1,200, 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.
What is the 2002-2009 Chevrolet Trailblazer Electronic Throttle Body / TAC System Fault — 'Reduced Engine Power' with P2135?
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.
What is the 2002-2009 Chevrolet Trailblazer Electric Fan Clutch Failure?
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.
What is the 2002-2009 Chevrolet Trailblazer 4.2L I6 Coolant Leak from Throttle Body and Water Pump?
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.
What is the 2002-2009 Chevrolet Trailblazer Front Axle Disconnect Actuator Failure?
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.
What is the 2002-2009 Chevrolet Trailblazer 2002-2009 TrailBlazer (GMT360) Instrument Cluster Stepper Motor Failure — Dead or Wildly Wrong Gauges?
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.
What is the 2002-2009 Chevrolet Trailblazer Rear Air-Leveling Suspension Failure on EXT / SS — Rear End Sags and Compressor Runs Constantly?
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.
What is the 2002-2009 Chevrolet Trailblazer 4.2L Atlas I6 (LL8) Exhaust Camshaft Position Actuator Solenoid Failure — P0014 / P0016?
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.
What is the 2002-2009 Chevrolet Trailblazer Front Wheel Hub / Bearing Assembly Failure Corrupting the ABS Signal?
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.
What is the 2002-2009 Chevrolet Trailblazer Power Window Regulator Failure?
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.
What is the 2002-2009 Chevrolet Trailblazer In-Tank Fuel Level Sender Fouling — Fuel Gauge Reads Empty, Full or Erratic?
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.
What is the 2002-2009 Chevrolet Trailblazer GMT360 Blower Motor Resistor / Blower Control Module Failure — Fan Works Only on High or Not at All?
The 2002-2009 TrailBlazer and its GMT360 siblings are notorious for losing cabin blower speeds. Manual (slider) HVAC trucks use a resistor pack that burns out its lower-speed elements, leaving the fan working only on the highest setting. Automatic (digital display) HVAC trucks in… Repairs typically run $40-$250. Severity: low.
What is the 2002-2009 Chevrolet Trailblazer HVAC Blend / Mode Door Actuator Stripped Gear — Clicking Dash and Heat on One Side Only?
Separate from the blower resistor, the GMT360 TrailBlazer uses several small plastic-geared HVAC actuators (driver temperature, passenger temperature, mode/direction, recirculation). A tooth strips off the final 'bull' gear inside the actuator and the motor then hunts back and fo… Repairs typically run $60-$450. Severity: low.
What is the 2002-2009 Chevrolet Trailblazer Intermediate Steering Shaft Clunk — Knock in the Column Over Bumps and on Turn-In?
The 2002-2009 TrailBlazer's intermediate steering shaft has a splined slip joint that loses its factory grease and begins to bind and release, transmitting a distinct clunk or knock up the column that the driver feels in the wheel — most obvious at low speed over driveways and sp… Repairs typically run $50-$350. Severity: low.
