The 2006 Buick Rainier rides on GM's robust GMT360 platform shared with the TrailBlazer. The 4.2L I6 has significant oil consumption and internal engine issues, while the 5.3L V8 is far more reliable but shares the platform's transmission and cooling system weaknesses.
4.2L I6 Catastrophic Oil Consumption and Engine Failure
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (1 quart per 500-1000 miles), Blue smoke from exhaust on startup or acceleration, Loss of power and misfires, Check engine light with lean codes (P0171/P0174), Complete engine failure if oil runs low
Fix: Caused by piston ring flutter and cylinder wear. Fix requires full engine rebuild or replacement with new pistons, rings, and cylinder honing. 18-24 hours labor for rebuild, 12-16 for used engine swap. Many shops won't rebuild these anymore—too risky.
Estimated cost: $4,500-7,500
Transmission Oil Cooler Line Failure and Cross-Contamination
Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Pink milkshake substance in coolant reservoir, Transmission slipping or delayed shifts, Engine overheating, Coolant in transmission causing total trans failure
Fix: Internal radiator transmission cooler fails, mixing coolant and ATF. Requires radiator replacement, external trans cooler installation, full trans flush (or rebuild if contaminated). If caught early: 4-6 hours. If trans damaged: add 16-20 hours for rebuild.
Estimated cost: $800-1,200 early / $3,500-5,000 with trans damage
4L60E/4L65E Transmission Failure
Occasional · high severity
Typical onset: 120,000-180,000 mi
Symptoms: Harsh 1-2 shift or slipping between gears, No 3rd or 4th gear, Transmission stuck in 2nd gear (limp mode), Whining noise from transmission, Burnt ATF smell
Fix: Common 3-4 clutch pack and sun shell failure. Rebuild requires replacing clutches, bands, and often the sun shell. 12-16 hours labor for R&R and rebuild. Used transmissions are gamble—most have same wear patterns.
Estimated cost: $2,200-3,500
Front Differential Actuator and 4WD System Failure
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Service 4WD message on dash, 4WD not engaging when selected, Grinding noise from front axle when turning, Clicking from front differential
Fix: Actuator motor on front differential fails (common) or encoder motor issues. Actuator replacement: 2-3 hours. If front diff itself is damaged from running partially engaged: 6-8 hours for rebuild or replacement.
Symptoms: Dome lights stay on constantly, draining battery, Lights flicker or won't turn on at all, Compass/temp display malfunctions, Door ajar light stays on with doors closed
Fix: Overhead console circuit board develops cold solder joints. Requires console removal and either reflow soldering or module replacement. 1-2 hours labor. DIY-friendly if you can solder.
Estimated cost: $200-400
Fuel Pump and Sender Assembly Failure
Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Fuel gauge reads incorrectly or erratically, No start condition or intermittent stalling, Whining noise from rear when key is on, Loss of power under acceleration
Fix: Fuel pump motor or level sender fails. Requires fuel tank drop, pump assembly replacement. 3-4 hours labor. Always replace the entire assembly, not just the pump—senders fail too.
Estimated cost: $600-900
Owner tips
If buying a 4.2L I6, budget for an engine—seriously. Do a cold-start inspection for blue smoke and check oil consumption religiously every 500 miles.
Inspect coolant reservoir immediately for any pink tint indicating trans cooler failure. Install external trans cooler preemptively ($300 job that saves $4,000).
Change transmission fluid every 50,000 miles with AC Delco Dexron VI—these transmissions are intolerant of old fluid.
The 5.3L V8 models are vastly more reliable than 4.2L—seek these out if possible.
Buy only if it's a 5.3L V8 with documented trans cooler replacement or external cooler added, and budget $2,000 for deferred maintenance; avoid 4.2L I6 models entirely unless free.
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.
EQUIPMENT:OTHER:LABELS · 05V552000
2005-12-07
CERTAIN TRUCKS AND SPORT UTILITY VEHICLES FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 110, "TIRE SELECTION AND RIMS." THESE VEHICLES WERE SHIPPED WITH TIRE AND LOADING INFORMATION LABELS LISTING AN INACCCURATE VEHICLE CAPACITY WEIGHT.
Consequence: A MISPRINTED LABEL COULD LEAD TO IMPROPER VEHICLE LOADING SPECIFICATIONS OR TIRE INFLATION WHICH COULD RESULT IN A TIRE FAILURE, INCREASING THE RISK OF A CRASH.
Remedy: OWNERS WILL BE PROVIDED WITH CORRECTED LABELS AND INSTALLATION INSTRUCTIONS. AT THE CUSTOMER'S OPTION, A DEALER CAN INSTALL THE LABEL FOR THEM. THE RECALL BEGAN ON MARCH 31, 2006. OWNERS MAY CONTACT BUICK AT 1-866-608-8080, CADILLAC AT 1-866-982-2339, CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463, HUMMER AT 1-800-732-5493, PONTIAC AT 1-800-620-7668, SATURN AT 1-800-972-8876, OR ISUZU AT 1-800-255-6727.
STEERING:HYDRAULIC POWER ASSIST:HOSE, PIPING, AND CONNECTIONS · 05V455000
2005-10-05
CERTAIN PASSENGER VEHICLES MAY HAVE BEEN BUILT WITH A POWER STEERING HOSE THAT IS NOT TO SPECIFICATION. UNDER EXTREME STEERING MANEUVERS, SUCH AS TURNING THE STEERING WHEEL FULLY TO THE LEFT OR RIGHT WHILE BRAKING, THE HOSE MAY FRACTURE AND LEAK FLUID.
Consequence: IF THIS WERE TO OCCUR, POWER STEERING ASSIST WOULD BE LOST AND INCREASED STEERING EFFORT WOULD BE REQUIRED. ON VEHICLES EQUIPPED WITH HYDRO-BOOST POWER BRAKES, IT COULD ALSO RESULT IN LOSS OF POWER BRAKE ASSIST AND INCREASED BRAKING EFFORT WOULD BE REQUIRED. IF THE POWER STEERING FLUID SPRAY WERE TO SPRAY ONTO HOT ENGINE PARTS, AN ENGINE COMPARTMENT FIRE COULD OCCUR.
Remedy: DEALERS WILL INSPECT THE POWER STEERING HOSE(S) FOR TWO SUSPECT DATE CODES AND REPLACE THEM IF REQUIRED. THE RECALL WILL BEGIN ON OCTOBER 14, 2005. OWNERS MAY CONTACT CHEVROLET AT 1-800-630-2438, GMC AT 1-866-996-9463, BUICK AT 1-866-608-8080, CADILLAC AT 1-866-982-2339, ISUZU AT 1-800-255-6727, OR HUMMER AT 1-800-732-5493.
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