2006 Chevrolet Trailblazer EXT

The 2006 Chevrolet Trailblazer EXT is a mid-size SUV known for its extended length, providing a more spacious third-row seat and increased cargo capacity compared to the standard Trailblazer. Engine options included the standard 4.2L Inline-6 (291 hp, 277 lb-ft of torque) and the optional 5.3L V8 (300 hp, 330 lb-ft of torque). Both engines were paired with a 4L60-E 4-speed automatic transmission. Owners often appreciate the Trailblazer EXT for its robust towing capabilities, comfortable ride (for its time), and abundant space. Common dislikes include its fuel economy, outdated interior, and some known reliability issues.

Engine

4.2L Inline-6

• Failed Ignition Coil
  • Description/Symptoms: Misfires, rough idling, check engine light. Often caused by heat and age-related degradation.
  • Solution: Replace the faulty ignition coil(s).
  • Estimated Cost to Fix: $50 - $150 per coil, plus labor.
  • Recalls: None Found
• Camshaft Actuator Solenoid Failure
  • Description/Symptoms: Rough idle, stalling, reduced power, check engine light with codes related to camshaft position.
  • Solution: Replace the camshaft actuator solenoid.
  • Estimated Cost to Fix: $150 - $300+
  • Recalls: None Found

5.3L V8

• Oil Consumption Issues
  • Description/Symptoms: Excessive oil consumption, often requiring frequent oil top-offs. Can lead to fouled spark plugs and catalytic converter damage.
  • Solution: Possible solutions range from using higher viscosity oil to replacing valve seals or piston rings, depending on the severity.
  • Estimated Cost to Fix: $50 (oil change) to $2000+ (major engine work)
  • Recalls: None Found
• Faulty Oil Pressure Sensor
  • Description/Symptoms: False low oil pressure readings on the dashboard gauge, potentially leading to unnecessary worry.
  • Solution: Replacement of the oil pressure sensor.
  • Estimated Cost to Fix: $50 - $150
  • Recalls: None Found

Transmission

4L60-E 4-Speed Automatic Transmission (Both Engines)

• Slipping or Harsh Shifting
  • Description/Symptoms: Transmission slipping between gears, delayed or harsh shifts. Often related to worn clutch packs or valve body issues.
  • Solution: Transmission fluid flush, valve body repair/replacement, or transmission rebuild/replacement.
  • Estimated Cost to Fix: $100 (fluid flush) to $3000+ (rebuild/replacement)
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering at low speeds, stalling when coming to a stop, unusual noises.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $500 - $1500+
  • Recalls: None Found

Suspension

• Air Suspension Failure (If Equipped)
  • Description/Symptoms: Rear of the vehicle sagging, compressor not running, “Service Ride Control” message.
  • Solution: Replace the air compressor, air springs, or ride height sensors.
  • Estimated Cost to Fix: $300 - $1000+ per component
  • Recalls: None Found
• Front Suspension Ball Joint Failure
  • Description/Symptoms: Clunking noises from the front end, loose steering, uneven tire wear.
  • Solution: Replace the worn ball joints.
  • Estimated Cost to Fix: $200 - $500+ per side
  • Recalls: None Found

Electrical

• Instrument Cluster Issues
  • Description/Symptoms: Erratic gauge readings (speedometer, fuel gauge), flickering lights, or complete cluster failure.
  • Solution: Instrument cluster repair or replacement.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks not working correctly, intermittent locking/unlocking.
  • Solution: Replace the faulty door lock actuator.
  • Estimated Cost to Fix: $100 - $300+ per door
  • Recalls: None Found

Exterior

• Rust Issues (Especially in areas with road salt)
  • Description/Symptoms: Rust on rocker panels, fenders, and undercarriage.
  • Solution: Rust repair or panel replacement.
  • Estimated Cost to Fix: $200 - $1000+ depending on severity
  • Recalls: None Found
• Liftgate Latch Failure
  • Description/Symptoms: Liftgate will not open or close properly.
  • Solution: Replace the liftgate latch assembly.
  • Estimated Cost to Fix: $100 - $300
  • Recalls: None Found

Interior

• HVAC Blower Motor Resistor Failure
  • Description/Symptoms: Blower motor only working on certain speeds, or not working at all.
  • Solution: Replace the blower motor resistor.
  • Estimated Cost to Fix: $50 - $200
  • Recalls: None Found
• Driver Information Center (DIC) Display Issues
  • Description/Symptoms: Dim or unreadable DIC display.
  • Solution: DIC repair or replacement.
  • Estimated Cost to Fix: $100 - $400+
  • Recalls: None Found

Summary

The 2006 Chevrolet Trailblazer EXT has several common issues, ranging from relatively inexpensive fixes like replacing ignition coils or sensors to more costly repairs such as transmission rebuilds or air suspension component replacements. Engine issues like oil consumption (particularly in the 5.3L V8) and general age-related component failures are frequent concerns. Electrical problems with the instrument cluster and door locks are also common. Rust, especially in colder climates, can significantly affect the vehicle’s lifespan. When considering purchasing one, a thorough inspection of these areas is highly recommended. The severity of the issues can range from minor inconveniences to major mechanical failures, with repair costs varying accordingly.