The 2007 Buick Rainier shares the GMT360 platform with TrailBlazer/Envoy and suffers from catastrophic engine failures on the 4.2L I6 (oil consumption, bearing failures) plus transmission cooler line leaks that can kill the 4L60E/4L65E. The 5.3L V8 models are significantly more reliable.
Symptoms: Excessive oil consumption (quart every 500-1000 mi), Metallic knocking or ticking from lower end, Loss of oil pressure at idle, Check engine light P0521 (oil pressure sensor), Smoking exhaust on startup
Fix: The 4.2L suffers from piston ring land failure and clogged oil screens leading to rod/main bearing starvation. Requires complete engine replacement or rebuild with updated pistons. 18-25 hours labor for removal, rebuild/replace, reinstall. Salvage engines often have same defect; reman is safer bet.
Estimated cost: $4,500-7,500
Transmission Oil Cooler Line Failure
Common · high severity
Typical onset: 70,000-130,000 mi
Symptoms: Red ATF puddle under vehicle near radiator, Pink milkshake in coolant reservoir (coolant in trans), Transmission slipping or overheating, White smoke from exhaust if coolant enters transmission
Fix: Factory crimp-style cooler lines corrode and rupture at the radiator connection, allowing cross-contamination that destroys the transmission. Requires new cooler lines (use aftermarket kit with flare fittings), external trans cooler, complete fluid flush, and often transmission rebuild if coolant entered. 3-4 hours for lines alone; add 12-18 hours if transmission damaged. Preventive replacement at 100k is cheap insurance.
Estimated cost: $350-600 (lines only); $2,800-4,200 (with trans rebuild)
Transfer Case Encoder Motor Failure (AWD models)
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: SERVICE 4WD message on dash, Unable to shift into 4WD modes, Clunking from transfer case area, Grinding noise when attempting 4WD engagement
Fix: The encoder motor (shift motor) on the NVG149 transfer case wears internally or the connector corrodes. Requires encoder motor replacement—accessible from underneath without removing t-case. 1.5-2.5 hours labor. Dorman aftermarket units available.
Estimated cost: $350-550
Front Differential Fluid Leak
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Gear oil dripping from front diff area, Whining noise from front end during turns, Vibration under acceleration (AWD models)
Fix: Front differential pinion seal and axle seals leak on AWD models. Requires seal replacement; inspect bearings while apart as fluid loss can damage them. Right side axle seal is notorious. 2-3 hours labor per side for axle seals; 3-4 hours for pinion seal.
Estimated cost: $300-550
HVAC Blend Door Actuator Failure
Common · low severity
Symptoms: Clicking/ticking noise from dash on startup or temp change, Stuck on heat or AC only, Different temps from different vents, Erratic temperature control
Fix: Plastic gear actuators fail on mode and temp doors. Multiple actuators behind dash. Passenger side temp actuator requires full dash removal (8-10 hours book time), but many techs cut access panels instead (3-4 hours). Driver side and mode door actuators are easier (1.5-2 hours each).
Symptoms: No start condition with crank but no fire, Stalling at operating temperature, Loss of power under acceleration, Fuel pump whine from rear, P0230 or P0231 codes
Fix: AC Delco pumps typically last but aftermarket replacements often fail early. Requires dropping fuel tank. 2.5-3.5 hours labor. Use OE or quality pump (Delphi, AC Delco). Strainer replacement included.
Estimated cost: $650-950
Rear Window Regulator/Motor Failure
Occasional · low severity
Typical onset: 60,000-110,000 mi
Symptoms: Rear glass won't open or close, Grinding noise from liftgate, Glass drops into door, Intermittent operation
Fix: Power rear window motor and regulator assembly fails. NHTSA recalls covered some VINs but many fall outside. Requires liftgate trim removal and regulator replacement. 2-2.5 hours labor. Aftermarket units from Dorman work adequately.
Estimated cost: $350-550
Owner tips
If buying a 4.2L I6 model, budget for engine replacement or buy one with documented rebuild using updated pistons
Replace transmission cooler lines preventively at 100k miles and install auxiliary trans cooler—saves $3k+ in trans work
Check for pink coolant or milkshake in overflow tank before purchase—walk away if present
5.3L V8 models are vastly more reliable; seek these out if possible
Keep meticulous oil change records on the 4.2L—oil consumption is early warning sign
Transfer case and differential fluid changes every 50k miles prevent expensive failures
Buy only if it's a 5.3L V8 with proof the trans cooler lines were replaced; 4.2L I6 models are ticking time bombs unless the engine has been rebuilt with updated components.
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.
Fitment notes: Side post terminals standard on GM vehicles; verify clearance
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Control Modules — 2007 Buick Rainier
Every control module on the 2004-2007 Buick Rainier — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Transfer Case Control Module (TCCM)2.5 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Integrated within transfer case assembly (encoder motor)
🔧 GM Tech 2
⚠️ AWD models only. Encoder motor contains control electronics. Position relearn required.
📍 Function integrated within BCM and PCM (Passlock II system)
🔧 GM Tech 2
⚠️ Not a separate module. Passlock II relearn required when PCM or BCM replaced. 10-minute relearn procedure.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
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.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2007 Buick Rainier 5.3L V8 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.