The 2009 Buick Lucerne rides on GM's G-platform with three engine choices, each carrying distinct reliability profiles. The 3.9L V6 and especially the 4.6L Northstar V8 are notorious for catastrophic engine failures, while the 3.8L Series II is the lone bulletproof option—transmission and electrical gremlins affect all variants.
4.6L Northstar V8 Head Gasket / Head Bolt Failure
Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: White smoke from exhaust on cold start, Coolant loss with no visible leaks, Overheating or intermittent temperature spikes, Oil milkshake in coolant reservoir, Check engine light with misfire codes
Fix: Northstar engines use torque-to-yield head bolts that stretch and fail, allowing coolant into cylinders. Proper fix requires pulling both heads, resurfacing, installing Timesert thread inserts, and new head studs—16-20 labor hours. Many engines are too far gone and need shortblocks.
Estimated cost: $4,500-7,500
3.9L V6 Piston Ring / Oil Consumption Failure
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Burning one quart of oil every 500-1,000 miles, Blue smoke on acceleration, Fouled spark plugs (especially cylinders 2 and 5), Carbon buildup causing misfires, Low compression on multiple cylinders
Fix: The 3.9L suffers from weak piston ring design and oil control issues. Only real fix is engine rebuild with updated pistons/rings or shortblock replacement—25-30 hours labor. Band-aids like top-end cleaning buy minimal time.
Estimated cost: $5,000-8,000
4T65E Transmission Oil Cooler Line / Internal Failure
Common · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Transmission fluid leaking from cooler lines at radiator, Harsh or delayed 2-3 shift, Slipping under load or on highway, Transmission overheating warnings, Pink milky fluid indicating coolant contamination
Fix: The 4T65E cooler lines corrode and leak; worse, the radiator internal cooler can rupture and mix coolant into ATF, destroying the transmission within miles. External line replacement is 2-3 hours; if coolant contaminated, full rebuild or reman unit needed at 12-16 hours.
Ignition Lock Cylinder / Passlock Security System Fault
Common · medium severity
Symptoms: No start with Security light flashing, Key stuck in ignition or won't turn, Intermittent no-crank condition, Must wait 10 minutes for relearn cycle to start car, Cluster message 'Service Theft Deterrent System'
Fix: GM's Passlock system fails in the lock cylinder or body control module, stranding owners. Lock cylinder replacement with relearn takes 2-3 hours; BCM replacement and programming adds another 1-2 hours. Resistor bypass kits exist but void security.
Estimated cost: $400-900
Lower Control Arm Bushing Deterioration
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Uneven inner tire wear, Alignment won't hold settings, Visible cracking or separation of rubber bushings
Fix: The front lower control arm bushings are press-fit and fail prematurely. Some shops press new bushings (3-4 hours both sides), but most replace complete arms due to seized fasteners—4-5 hours plus alignment.
Estimated cost: $600-1,100
Fuel Pump / Sending Unit Module Failure
Occasional · medium severity
Typical onset: 100,000-150,000 mi
Symptoms: Fuel gauge erratic or stuck on empty/full, No start / crank no start condition, Engine stumble or stall when fuel level below 1/4 tank, Whining noise from rear seat area, Check engine light with low fuel pressure codes
Fix: The in-tank fuel pump module includes pump, filter, and level sender—all fail independently or together. Tank must be dropped, 3-4 hours labor. Use AC Delco or equivalent; aftermarket pumps often fail within a year.
Estimated cost: $700-1,200
Owner tips
If buying a Lucerne, ONLY consider the 3.8L V6—it's the sole reliable engine. Avoid 3.9L and 4.6L unless you budget for engine replacement.
Change transmission fluid every 50k miles with full-synthetic Dexron VI and consider external cooler to extend 4T65E life.
Replace transmission cooler lines proactively at 100k miles before they corrode through—cheap insurance.
Carry a spare ignition cylinder or know the Passlock relearn procedure; keep a BCM contact number handy for roadside lockouts.
Buy only with the 3.8L V6 and service records showing transmission maintenance—otherwise, you're gambling on a $5,000+ engine or trans rebuild within 20k miles.
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; battery located in trunk
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Every control module on the 2006-2011 Buick Lucerne — 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.
⚠️ Only on vehicles with memory seat option; position relearn via driver controls
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.
This defect can affect the safe operation of the airbag system. Until this recall is performed, customers should remove all items from their key rings, leaving only the ignition key. The key fob (if applicable), should also be removed from the key ring.
General Motors LLC (GM) is recalling certain model year 2005-2009 Buick LaCrosse, 2006-2011 Buick Lucerne, 2000-2005 Cadillac DeVille, 2006-2011 Cadillac DTS, 2006-2014 Chevrolet Impala, and 2006-2007 Chevrolet Monte Carlo vehicles. In the affected vehicles, the weight on the key ring and road conditions or some other jarring event may cause the ignition switch to move out of the run position, turning off the engine.
Consequence: If the key is not in the run position, the air bags may not deploy if the vehicle is involved in a crash, increasing the risk of injury. Additionally, a key knocked out of the run position will cause loss of engine power, power steering, and power braking, increasing the risk of a vehicle crash.
Remedy: GM will notify owners, and dealers will install two key rings and an insert in the key slot or a cover over the key head on all ignition keys, free of charge. The recall began on September 23, 2014. Owners may contact General Motors customer service at 1-800-521-7300 (Buick), 1-800-458-8006 (Cadillac), and 1-800-222-1020 (Chevrolet). GM's number for this recall is 14299.
ELECTRICAL SYSTEM · 10V240000
2010-06-04
GM IS RECALLING CERTAIN MODEL YEAR 2006-2009 BUICK, LUCERNE; CADILLAC DTS; HUMMER H2; MODEL YEAR 2008-2009 BUICK ENCLAVE; CADILLAC CTS; MODEL YEAR 2007-2009 CADILLAC ESCALADE, ESCALADE ESV, ESCALADE EXT; CHEVROLET AVALANCHE, SILVERADO, SUBURBAN, TAHOE; GMC ACADIA, SIERRA, YUKON, YUKON XL; SATURN OUTLOOK; AND MODEL YEAR 2009 CHEVROLET TRAVERSE VEHICLES EQUIPPED WITH A HEATED WASHER FLUID SYSTEM (HWFS). A RECALL WAS IMPLEMENTED IN 2008 TO ADD A FUSE TO THE CONTROL CIRCUIT HARNESS TO ADDRESS THE POTENTIAL CONSEQUENCES OF A PRINTED CIRCUIT BOARD (PCB) ELECTRICAL SHORT. HOWEVER, THERE HAVE BEEN NEW REPORTS OF THERMAL INCIDENTS ON HWFS MODULES AFTER THIS IMPROVEMENT WAS INSTALLED. THESE INCIDENTS RESULTED FROM A NEW FAILURE MODE ATTRIBUTED TO THE DEVICE'S THERMAL PROTECTION FEATURE. THE SIGNIFICANCE VARIES FROM MINOR DISTORTION TO CONSIDERABLE MELTING OF THE PLASTIC AROUND THE HWFS FLUID CHAMBER.
Consequence: IT IS POSSIBLE FOR THE HEATED WASHER MODULE TO IGNITE AND A FIRE MAY OCCUR.
Remedy: DEALERS WILL PERMANENTLY DISABLE AND REMOVE THE HEATED WASHER FLUID MODULE. AN UPDATED PAGE FOR THE OWNER MANUAL WILL BE PROVIDED AND INSERTED IN THE OWNER MANUAL TO DOCUMENT THAT THE FEATURE HAS BEEN PERMANENTLY DISABLED AND REMOVED FROM THE VEHICLE. THE SAFETY RECALL BEGAN ON JUNE 11, 2010. OWNERS MAY CONTACT BUICK AT 1-866-608-8080, CADILLAC AT 1-866-982-2339, CHEVROLET AT 1-800-630-2438, SATURN AT 1-800-972-8876, GMC AT 1-866-996-9463 AND HUMMER AT 1-800-732-5493 OR AT THE OWNER CENTER AT WWW.GMOWNERCENTER.COM.
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 2009 Buick Lucerne 3.9L V6 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.