The 2005 Chevrolet Trailblazer EXT is a mid-size SUV from GM's GMT360 platform, notable for its extended wheelbase and standard third-row seating, differentiating it from the shorter Trailblazer. Produced from 2002 to 2006, it offered LS and LT trims. Its popularity stemmed from providing SUV utility, a strong standard 4.2L inline-six engine, and crucial seven-passenger capacity at an accessible price point, making it a compelling family hauler.
The Good
Key advantages include robust performance from its potent inline-six or optional V8, strong towing capabilities, and generous interior space with third-row seating for comfort. Its traditional SUV design appeals emotionally, while its long-term durability and current affordable used market value offer practical appeal for budget-conscious buyers seeking capability and room.
The Bad
Common weaknesses include issues with HVAC blend door actuators, inaccurate fuel level senders, and premature ABS sensor failures. Interior plastics can feel dated, and ride quality may be firm. Rust can be a concern on the frame and body in saltier climates, requiring thorough inspection before purchase.
2005 Chevrolet Trailblazer EXT: Quick Overview
- Engine Options:
- Standard: 4.2-liter "Atlas" LL8 DOHC Inline-6 cylinder engine.
- Optional: 5.3-liter "Vortec" LM4 or L59 V8 engine (only available on EXT models).
- Horsepower:
- 4.2L I6: 275 horsepower and 275 lb-ft of torque.
- 5.3L V8: 300 horsepower and 330 lb-ft of torque.
- Fuel Economy (EPA Estimated - 4WD figures often slightly lower):
- 4.2L I6 (2WD/4WD): Approximately 15-16 MPG city / 20-22 MPG highway.
- 5.3L V8 (2WD/4WD): Approximately 13-14 MPG city / 17-19 MPG highway.
- 0-60 MPH Times (Approximate):
- 4.2L I6: Around 7.5-8.0 seconds.
- 5.3L V8: Around 7.0-7.5 seconds.
- Towing Capacity (Maximum):
- 4.2L I6: Up to 6,300 lbs (with proper equipment).
- 5.3L V8: Up to 6,700 lbs (with proper equipment).
- Trim-Level Features:
- LS (Base Trim):
- Standard cloth upholstery, manual climate control, AM/FM stereo with CD player, power windows and locks, cruise control, 16-inch wheels, and standard third-row seating unique to EXT.
- Optional: Power driver's seat, remote keyless entry, OnStar.
- LT (Upgraded Trim):
- Adds to LS features: Power driver's seat, upgraded cloth or optional leather seating surfaces, automatic climate control, upgraded audio system (often Bose), fog lamps, chrome exterior accents, steering wheel audio controls, and body-colored exterior mirrors.
- Optional: Heated seats, power sunroof, rear-seat DVD entertainment system, 17-inch alloy wheels, StabiliTrak electronic stability control (primarily with V8).
- LS (Base Trim):
2005 Chevrolet Trailblazer EXT Specifications
Vehicle Information
| Year | 2005 |
| Make | Chevrolet |
| Model | Trailblazer EXT |
| Trim | - |
| Style | SUV |
| Type | Sport Utility Vehicle |
| Category | Standard Sport Utility Vehicle |
Manufacturing Details
| Made In | United States |
| Manufacturing City | OKLAHOMA CITY |
Dimensions
| Doors | 4-Door |
| Curb Weight | 4954 pounds |
| Gross Vehicle Weight Rating | 6400 pounds |
| Overall Height | 75.50 inches |
| Overall Length | 207.80 inches |
| Overall Width | 74.70 inches |
| Wheelbase Length | 129.00 inches |
| Standard Seating | 7 |
Engine & Performance
| Engine | 4.2L I6 |
| Engine Size | 4.2L |
| Engine Cylinders | 6 |
| Transmission | 4-Speed Automatic |
| Transmission Type | Automatic |
| Transmission Speeds | 4-Speed |
| Drivetrain | Four-Wheel Drive |
Additional Features
| Anti-Brake System | 4-Wheel ABS |
| Steering Type | Rack & Pinion |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | $32,515 |
| Invoice Price | $29,426 |
| Delivery Charges | $685 |
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What Problems Does the 2005 Chevrolet Trailblazer EXT Have?
The 2005 Chevrolet Trailblazer EXT, like its GMT360 platform siblings, has several frequently reported problems. A very common issue involves the HVAC blend door actuators, which can fail, leading to inconsistent heating or cooling, often requiring multiple replacements. Another prevalent problem is the fuel level sender failing, causing inaccurate or erratic fuel gauge readings; this typically necessitates replacing the entire fuel pump module. Drivers often report ABS sensor failures, particularly for the front wheels, triggering the ABS and brake warning lights and potentially affecting braking performance.
Window regulator failures are also common, where windows may stop operating or fall into the door. Rust can be a significant long-term concern, especially on the frame and suspension components, as well as around wheel wells and door bottoms, particularly in regions that use road salt. Electrical glitches, sometimes related to the Body Control Module (BCM) or wiring harnesses, can lead to various intermittent issues. Fan clutch failures and premature wear of suspension components like ball joints and tie rods are also noted.
Regarding recalls for the 2005 model year, some notable ones include: a recall for the headlight switch, which could overheat and cause lights to fail; an ignition switch recall for potential unexpected engine shut-off (though less prevalent than on other GM models); and recalls related to the fuel pump module due to potential cracks or fuel leaks. Owners should always check if relevant recall repairs have been performed. While the 4.2L I6 engine is generally robust, maintaining the cooling system and addressing common accessory failures is key to long-term reliability. Transmission issues can arise at higher mileages, though they are not universally catastrophic.
Window regulator failures are also common, where windows may stop operating or fall into the door. Rust can be a significant long-term concern, especially on the frame and suspension components, as well as around wheel wells and door bottoms, particularly in regions that use road salt. Electrical glitches, sometimes related to the Body Control Module (BCM) or wiring harnesses, can lead to various intermittent issues. Fan clutch failures and premature wear of suspension components like ball joints and tie rods are also noted.
Regarding recalls for the 2005 model year, some notable ones include: a recall for the headlight switch, which could overheat and cause lights to fail; an ignition switch recall for potential unexpected engine shut-off (though less prevalent than on other GM models); and recalls related to the fuel pump module due to potential cracks or fuel leaks. Owners should always check if relevant recall repairs have been performed. While the 4.2L I6 engine is generally robust, maintaining the cooling system and addressing common accessory failures is key to long-term reliability. Transmission issues can arise at higher mileages, though they are not universally catastrophic.
How long will the 2005 Chevrolet Trailblazer EXT last?
With proper and consistent maintenance, a 2005 Chevrolet Trailblazer EXT can reliably reach 150,000 to 200,000 miles, with many owners reporting even higher mileage. The 4.2L inline-six engine and 4L60-E transmission are generally durable components if fluid changes are performed regularly. However, long-term durability is often hampered by the aforementioned common weaknesses. Over time, rust on the frame and body can become extensive, impacting structural integrity and appearance. Electrical gremlins, worn suspension components like bushings and ball joints, and persistent HVAC and fuel gauge issues often arise, requiring attention. While the core powertrain can last, keeping the ancillary systems and body in good shape is crucial for extended years of service beyond 15 years.
What Technology & Safety Features are Included?
The 2005 Chevrolet Trailblazer EXT offered a practical but not overly advanced suite of built-in technology and entertainment features for its era. Standard entertainment included an AM/FM stereo with a CD player. Higher trims or optional packages often featured an upgraded Bose premium sound system. OnStar telematics was a notable optional feature, providing roadside assistance, emergency services, and turn-by-turn navigation (subscription required). An optional rear-seat DVD entertainment system was a popular addition for families, mounted in the ceiling. Steering wheel-mounted audio controls were available on LT trims for convenience.
Driver-assistance features were quite basic by modern standards, limited primarily to standard cruise control. Advanced systems like blind-spot monitoring, lane departure warning, or adaptive cruise control were not available. The focus was on fundamental driving aids rather than active safety systems.
Safety features included standard dual front airbags, 4-wheel anti-lock disc brakes (ABS), and a LATCH system for child seats. Optional front side-impact airbags were available, significantly enhancing side-crash protection. Traction control was standard on some trims and optional on others, while GM's StabiliTrak electronic stability control system was an option, particularly with the 5.3L V8 engine, offering improved handling stability.
Crash-test ratings:
Driver-assistance features were quite basic by modern standards, limited primarily to standard cruise control. Advanced systems like blind-spot monitoring, lane departure warning, or adaptive cruise control were not available. The focus was on fundamental driving aids rather than active safety systems.
Safety features included standard dual front airbags, 4-wheel anti-lock disc brakes (ABS), and a LATCH system for child seats. Optional front side-impact airbags were available, significantly enhancing side-crash protection. Traction control was standard on some trims and optional on others, while GM's StabiliTrak electronic stability control system was an option, particularly with the 5.3L V8 engine, offering improved handling stability.
Crash-test ratings:
- NHTSA (National Highway Traffic Safety Administration):
- Frontal Impact (Driver): 4 out of 5 stars
- Frontal Impact (Passenger): 4 out of 5 stars
- Side Impact (Front Seat): 5 out of 5 stars
- Side Impact (Rear Seat): 3 out of 5 stars
- IIHS (Insurance Institute for Highway Safety):
- Moderate Overlap Front: "Moderate" rating
- Side Impact (with optional side airbags): "Acceptable" rating
- Side Impact (without optional side airbags): "Marginal" rating
What Colors Options are Available?
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2005 Chevrolet Trailblazer EXT Prices and Market Value
When new in 2005, the Chevrolet Trailblazer EXT typically started around $28,000 for an LS 2WD model, with well-equipped LT 4WD versions reaching into the mid-$30,000s. Today, in the used market (2024), prices range dramatically from as low as $2,000 for high-mileage examples with cosmetic or mechanical issues, up to $7,000 or more for well-maintained, lower-mileage units. Depreciation has been significant, which is typical for older body-on-frame SUVs. Factors heavily affecting current resale value include overall condition, mileage, evidence of regular maintenance, rust levels (especially frame), and whether common issues like the fuel sender or HVAC actuators have been addressed. The presence of the V8 engine or 4WD can sometimes command a slight premium.
2005 Chevrolet Trailblazer EXT Cost of Ownership
Insurance for a 2005 Trailblazer EXT is generally moderate, reflecting its age and SUV classification. Fuel costs can be a significant factor; the 4.2L I6 is decent for its class but still an SUV, while the 5.3L V8 is notably thirstier. Routine maintenance (oil changes, tires) is relatively inexpensive due to widespread parts availability. However, repair costs can add up due to common issues like HVAC actuators, fuel pump modules, and ABS sensors, which can be moderately expensive to fix. Rust repair, if needed, can be costly. Overall, it's not particularly expensive to maintain at the component level, but frequent repairs for known issues can make it a moderately costly vehicle to own long-term, rather than exceptionally economical.
2005 Chevrolet Trailblazer EXT Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
15 gallons
City Mileage
14 miles/gallon
Highway Mileage
18 miles/gallon
2005 Chevrolet Trailblazer EXT Safety Rating
NHTSA
IIHS
2005 Chevrolet Trailblazer EXT Warranty
Basic
Original warranty
36 months / 36,000 miles
Estimated remaining
Expired
Powertrain
Original warranty
36 months / 36,000 miles
Estimated remaining
Expired
Rust
Original warranty
72 months / 100,000 miles
Estimated remaining
Expired
2005 Chevrolet Trailblazer EXT Insurance
Insurance for a 2005 Chevrolet Trailblazer EXT is moderately priced, reflecting its status as a Sport Utility Vehicle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2005 Chevrolet Trailblazer EXT Compare to Other Sport Utility Vehicle?
The 2005 Chevrolet Trailblazer EXT competed in a crowded mid-size SUV segment against rivals like the Ford Explorer, Dodge Durango, Nissan Pathfinder, and Toyota 4Runner. In terms of performance, the Trailblazer EXT's standard 4.2L inline-six was a standout, offering more horsepower than many base V6 competitors, while its optional 5.3L V8 provided robust towing and acceleration, often outperforming the Explorer's V8 and easily surpassing the Pathfinder's V6.
Regarding features, the Trailblazer EXT was competitive, offering amenities like optional Bose audio, OnStar, and rear DVD entertainment, especially in LT trim. It often provided strong value for its feature set, particularly for its crucial third-row seating, which some rivals, like the 4Runner, didn't offer in all configurations or as standard.
Reliability is a mixed bag. While the Trailblazer's engines and transmissions are generally robust, frequent issues with HVAC blend door actuators, fuel level senders, and ABS sensors can detract from its overall reliability score. This makes it generally on par with the Ford Explorer and Dodge Durango of the same era, which also had their own common issues. The Toyota 4Runner, however, often holds a stronger reputation for long-term reliability and fewer nagging problems, but typically comes at a higher price point.
On price, the Trailblazer EXT typically presented an excellent value proposition, both new and especially on the used market. It was often more affordable than comparable Japanese rivals like the 4Runner or Nissan Pathfinder, making it an attractive option for budget-conscious buyers needing a seven-seater SUV.
Alternatives:
Regarding features, the Trailblazer EXT was competitive, offering amenities like optional Bose audio, OnStar, and rear DVD entertainment, especially in LT trim. It often provided strong value for its feature set, particularly for its crucial third-row seating, which some rivals, like the 4Runner, didn't offer in all configurations or as standard.
Reliability is a mixed bag. While the Trailblazer's engines and transmissions are generally robust, frequent issues with HVAC blend door actuators, fuel level senders, and ABS sensors can detract from its overall reliability score. This makes it generally on par with the Ford Explorer and Dodge Durango of the same era, which also had their own common issues. The Toyota 4Runner, however, often holds a stronger reputation for long-term reliability and fewer nagging problems, but typically comes at a higher price point.
On price, the Trailblazer EXT typically presented an excellent value proposition, both new and especially on the used market. It was often more affordable than comparable Japanese rivals like the 4Runner or Nissan Pathfinder, making it an attractive option for budget-conscious buyers needing a seven-seater SUV.
Alternatives:
- Similar Alternative: A 2005-2006 Ford Explorer (especially the extended Eddie Bauer or Limited trims) offers a similar body-on-frame experience with available V8 power and third-row seating, often at comparable used prices.
- Better Reliability (but pricier): The Toyota 4Runner is a perennial favorite for exceptional long-term reliability and off-road capability, though the 2005 model did not typically offer a third row in all configurations and used prices are significantly higher.
- More Refined/Car-like (less towing): A Honda Pilot or Toyota Highlander offers a unibody platform with a smoother ride, better fuel economy, and strong reliability, but typically less towing capacity and a less rugged feel.
Final Verdict: Is the 2005 Chevrolet Trailblazer EXT a Good Sport Utility Vehicle?
The 2005 Chevrolet Trailblazer EXT is ideal for families on a tight budget needing genuine seven-passenger seating and significant towing capability without moving to a full-size SUV. It's also suitable for those who appreciate a traditional body-on-frame SUV's ruggedness and robust powertrain. It is definitely worth buying on the used market, provided specific conditions are met.
Buyers should focus exclusively on well-maintained examples, ideally with comprehensive service records. A pre-purchase inspection by a trusted mechanic is absolutely critical to assess for common issues like HVAC, fuel sender, ABS faults, and especially frame rust. The LS trim offers fantastic value for basic transportation, while the LT adds desirable comfort features. If towing is a priority, seek out the V8 engine. While repairs for known issues can be moderate, a well-cared-for EXT can serve as a dependable, spacious, and capable family vehicle for years to come.
Buyers should focus exclusively on well-maintained examples, ideally with comprehensive service records. A pre-purchase inspection by a trusted mechanic is absolutely critical to assess for common issues like HVAC, fuel sender, ABS faults, and especially frame rust. The LS trim offers fantastic value for basic transportation, while the LT adds desirable comfort features. If towing is a priority, seek out the V8 engine. While repairs for known issues can be moderate, a well-cared-for EXT can serve as a dependable, spacious, and capable family vehicle for years to come.
Drew B
Drew is a seasoned automotive expert and contributor to VinCheck.info. With nearly 15 years of experience as a former Porsche technician, he brings a wealth of hands-on knowledge to his writing. Born in North Carolina, a region renowned for its deep-rooted NASCAR culture, Drew developed a passion for cars early in life, often building and working on vehicles from a young age. At VINCheck, Drew leverages his extensive technical background to provide in-depth analyses of various vehicles. His articles often focus on engine performance, reliability, and maintenance insights, offering readers practical information grounded in real-world experience. Some of his notable contributions include reviews on the Mazda CX-5's longevity and detailed examinations of engine options for models like the 2011 Toyota Camry and Tacoma