The 2007 TrailBlazer SS pairs the potent LS2 V8 with the GMT360 platform's aging 4L60E/4L65E transmission, creating a performance SUV with two major Achilles heels: transmission failures and active fuel management (AFM) lifter collapse leading to catastrophic engine damage.
AFM Lifter Failure Leading to Catastrophic Engine Damage
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Ticking/tapping noise from engine on cold start that may disappear when warm, Check engine light with P0300-series misfire codes or P0521 oil pressure, Loss of power, rough idle, fuel economy drop, Metal shavings in oil, collapsed lifter destroys camshaft lobes and pushrod
Fix: AFM system failure requires camshaft replacement, lifters, pushrods, and often machine work on cylinder heads. Many owners opt for AFM delete kit during repair. Budget 18-25 labor hours for proper repair with head work. Neglected cases result in complete engine rebuild or replacement when metal contaminates bearings.
Estimated cost: $3,500-6,500
4L65E Transmission Failure
Common · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Harsh 1-2 or 2-3 shifts, slipping under acceleration, Shuddering during light throttle cruise around 40-50 mph, Transmission fluid discolored or burnt smell, Delayed engagement when shifting into drive or reverse
Fix: The 4L65E behind the 395hp LS2 is undertorqued and wears clutch packs, particularly 3-4 clutches. Internal oil cooler line failures also contaminate fluid. Rebuild requires 10-14 hours; many shops recommend performance rebuild with upgraded clutches and shift kit for longevity. External cooler line leaks can contaminate coolant requiring radiator replacement as well.
Estimated cost: $2,800-4,200
Transmission Oil Cooler Line Failure (Internal Radiator)
Common · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Pink or milky transmission fluid (coolant contamination), Transmission slipping or erratic shifting after fluid turns milky, Engine overheating or sweet smell from exhaust, Rapid transmission failure after cross-contamination begins
Fix: The internal transmission cooler inside the radiator develops leaks, allowing coolant and ATF to mix. Requires radiator replacement, full transmission fluid flush (often multiple flushes), and external auxiliary cooler installation. If caught early (within days), transmission may survive; delayed response means full rebuild. 4-6 hours labor for radiator and cooler, plus transmission service or rebuild.
Front Differential Actuator and Carrier Bearing Failure
Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Service 4WD light illuminated on dash, Grinding or humming noise from front differential during acceleration, 4WD system won't engage or engages randomly, Clunking when turning if carrier bearings worn
Fix: The electronic front axle actuator fails, leaving vehicle in 2WD. Carrier bearings also wear on AWD models due to constant engagement. Actuator replacement is 2-3 hours; carrier bearing service requires differential teardown at 5-7 hours. Many owners upgrade to manual locking hubs to eliminate actuator issues.
Rear Suspension Control Arm and Bushing Degradation
Common · medium severity
Typical onset: 80,000-110,000 mi
Symptoms: Clunking noise from rear over bumps or during acceleration/braking, Rear end feels loose or wanders on highway, Uneven rear tire wear, Visible cracking or separation of rubber bushings on control arms
Fix: The rear upper and lower control arm bushings deteriorate, causing handling slop and alignment issues. The SS's performance tires accelerate wear. Complete rear control arm replacement recommended over bushing-only jobs due to labor overlap. 4-6 hours for all four arms plus alignment.
Estimated cost: $1,200-1,800
Fuel Pump and Fuel Filter Clogging
Occasional · medium severity
Typical onset: 100,000-150,000 mi
Symptoms: Hard starting or extended cranking, especially when hot, Loss of power under heavy acceleration or uphill, Engine sputtering or hesitation at highway speeds, Check engine light with lean fuel codes (P0171/P0174)
Fix: In-tank fuel pump strainers clog with sediment, starving the thirsty LS2. The inline fuel filter (frame-mounted) also restricts flow. Pump replacement requires tank drop at 3-4 hours; filter alone is 0.5-1 hour but often done together. Ethanol fuel exacerbates debris buildup in these aging tanks.
Disable AFM immediately with a Range AFM disabler or tune—this is preventive insurance worth $200 versus $5,000 in engine work
Install an external transmission cooler and bypass the internal radiator cooler lines to prevent catastrophic fluid contamination
Use quality full-synthetic 5W-30 oil and change every 5,000 miles max—the LS2's AFM system is oil-pressure dependent
Budget for a transmission rebuild if buying over 100k miles; consider it a maintenance item on this platform
Inspect rear control arm bushings annually—they fail gradually and destroy tire costs if ignored
Buy one only if AFM is already deleted or you're prepared to do it immediately, and budget $3-5k for an inevitable transmission rebuild—otherwise this is a spectacular 400hp sleeper with typical GMT360 quirks.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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VISIBILITY:POWER WINDOW DEVICES AND CONTROLS · 15V599000
2015-09-24
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.
Consequence: The protective coating may not eliminate the risk that the circuit board could short and result in a fire, even while the vehicle is unattended.
Remedy: GM will notify owners, and dealers will install a new driver's door switch module, free of charge. The recall began on November 2, 2015. Owners may contact Buick customer service at 1-800-521-7300, Chevrolet customer service at 1-800-222-1020, and GMC customer service at 1-800-462-8782. GM's number for this recall is 15700.
EXTERIOR LIGHTING:HEADLIGHTS · 15V519000
2015-08-14
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.
Consequence: Headlamps that do not illuminate reduce the driver's ability to see the roadway and reduce the vehicle's visibility to oncoming vehicles, both of which increase the risk of a vehicle crash.
Remedy: GM will notify owners, and dealers will replace the HDM, free of charge. The recall began on May 17, 2016. Owners may contact Buick customer service at 1-800-521-7300 or Pontiac customer service at 1-800-762-2737. GM's number for this recall is 14291.
VISIBILITY:POWER WINDOW DEVICES AND CONTROLS · 14V404000
2014-07-02
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.
Consequence: A short in the circuit board could lead to a fire, increasing the risk of personal injury. A fire could occur even while the vehicle is not in use. As a precaution, owners are advised to park outside until the remedy has been made.
Remedy: GM will notify owners, and dealers will inspect the part number on the door module, and install a new door module if necessary, free of charge. Parts for the remedy are not currently available. An interim letter was mailed to owners in August 2014. A second owner letter will be mailed when parts are available. Owners may contact GM customer service at 1-800-521-7300 (Buick), 1-800-222-1020 (Chevrolet), 1-800-462-8782 (GMC), 1-800-955-9007 (SAAB), and 1-800-255-6727 (Isuzu). GM's number for this recall is 14309. NOTE: This recall provides a new remedy for all vehicles covered by recall 13V-248. Vehicles whose modules were modified but not replaced as part of the previous recall remedy must have their vehicles remedied again under this campaign.
ELECTRICAL SYSTEM · 13V248000
2013-06-13 · EA12004
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.
Consequence: A short in the circuit board could lead to a fire, increasing the risk of personal injury. A fire could occur even while the vehicle is not in use. As a precaution, owners are advised to park outside until the remedy has been made.
Remedy: Owners will be contacted and dealers will test the driver's door module. If the module is functioning properly, a protective coating will be applied. If the module is not functioning properly, it will be replaced. These repairs will be done free of charge. GM will notify Buick, Chevrolet, and GMC owners, Isuzu and Saab will contact their respective owners. The recall began on August 2, 2013. Buick owners may contact the owner center at 1-800-521-7300, Chevrolet owners at 1-866-694-6546, GMC owners at 1-866-996-9463, Isuzu owners at 1-800-255-6727, and Saab owners at 1-800-955-9007. GM's campaign number is 12180. This recall is an expansion of recall 12V-406.
ELECTRICAL SYSTEM · 12V406000
2012-08-16 · EA12004
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.
Consequence: A short in the circuit board could lead to a fire, increasing the risk of personal injury. A fire could occur even while the vehicle is not in use. As a precaution, owners are advised to park outside until the remedy has been made.
Remedy: Parts for this recall are expected to available in March 2013. GM will notify Buick, Chevrolet, and GMC owners when parts are available. Buick owners may contact the owner center at 1-800-521-7300, Chevrolet owners at 1-866-694-6546, and GMC owners at 1-866-996-9463. Isuzu owners will be notified by Isuzu Motors when parts are available. Owners may contact Isuzu customer service at 1-800-255-6727. SAAB owners will be notified by SAAB Cars North America when parts are available and for inquiries, owners may call SAAB customer service at 1-800-955-9007.
Performance
Horsepower
395hp
Torque
400lb-ft
0–60 mph
5.7sec
Quarter mile
14.2sec
Top speed
130mph
Capability & size
Towing capacity
6,200lb
Payload
1,200lb
Curb weight
4,850lb
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2007 Chevrolet TrailBlazer SS 6.0L V8 LS2 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.