The 2006 LaCrosse sits on GM's W-body platform and shares powertrain DNA with the Impala and Grand Prix. The 3.8L Series II is generally bulletproof, but the 3.6L VVT suffers from well-documented timing chain and intake manifold issues that can grenade the motor if ignored.
3.6L VVT Timing Chain Stretch and Guide Failure
Common · high severity
Typical onset: 80,000-120,000 mi
Symptoms: Cold-start rattle for 2-3 seconds then goes away, Check engine light with cam/crank correlation codes (P0017, P0008), Poor idle quality or stalling after warm-up, Catastrophic engine failure if chains jump time
Fix: Requires front engine disassembly to replace both primary and secondary chains, guides, tensioners, and cam phasers. Book time 12-15 hours depending on how bad the damage is. Often find worn cam bearing journals requiring head work or short block replacement if metal debris circulated.
Symptoms: Sweet coolant smell in cabin or under hood, Coolant loss with no visible external leak, White smoke from exhaust on cold start, Possible misfire codes if coolant pools in cylinder
Fix: Upper and lower intake manifolds off, gaskets replaced. Also a good time to do valve cover gaskets since you're there. 6-8 hours labor. The OE plastic gaskets degrade and allow coolant into the valley.
Estimated cost: $900-1,400
4T65-E Transmission Pressure Control Solenoid and Harsh Shifts
Common · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Harsh 1-2 or 2-3 shifts especially when cold, Flare or slip on upshifts, Check engine light with P0741 (TCC solenoid) or P0748, Burnt ATF smell or dark fluid
Fix: Drop pan, replace pressure control solenoid and service. If clutches are burnt, you're looking at rebuild or used trans swap. Solenoid job is 3-4 hours; rebuild is 12-16 hours.
Typical onset: 100,000+ mi or salt-belt cars earlier
Symptoms: ATF puddle under front of vehicle, Low fluid level causing shift issues, Lines visibly rusted at radiator or frame mounts
Fix: Replace hard lines and rubber hoses from trans to radiator. Lines rust out at fittings. 2-3 hours labor plus fluid refill and relearn procedure.
Estimated cost: $400-700
Power Steering Pump Whine and Leak
Occasional · low severity
Typical onset: 80,000-130,000 mi
Symptoms: Whining noise on cold start or during turns, Power steering fluid leak at pump or high-pressure hose, Heavy steering effort intermittently
Fix: Replace pump and/or high-pressure hose. Pump replacement is 2-3 hours. Flush system to clear debris. Common on all W-bodies.
Estimated cost: $450-750
Front Strut Mount Bearing Noise
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking or popping from front end over bumps, Noise when turning steering wheel at low speed, Uneven tire wear on front
Fix: Replace strut mounts and bearing plates. Typically done with strut replacement since you're there anyway. 3-4 hours for both sides with alignment.
Estimated cost: $400-700 mounts only; $800-1,200 with struts
Ignition Lock Cylinder Sticking (Recall 06V320)
Occasional · medium severity
Symptoms: Key won't turn or is very difficult to turn, Key stuck in ignition after shutting off, Intermittent no-start because switch doesn't fully engage
Fix: Recall repair or lock cylinder replacement. Dealer may cover under recall depending on VIN. Independent shops charge 1.5-2 hours to swap cylinder and rekey.
Estimated cost: $250-450 if not recall-covered
Owner tips
If buying a 3.6L, insist on records showing timing chains were done or budget $3,000-4,000 immediately — this is not optional after 100k miles
Check for coolant level drop and transmission fluid color/level at every oil change — both motors and the 4T65-E don't tolerate neglect
Avoid 3.6L VVT cars with no maintenance records — the 3.8L Series II is far more forgiving and reliable for high-mileage daily use
Buy the 3.8L variant if you want a comfortable, cheap highway cruiser; avoid the 3.6L unless timing chains are already done and documented.
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 engine compartment
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 2005-2007 Buick LaCrosse — 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.
⚠️ Seat position relearn required; controls driver seat and mirrors
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.
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.
ELECTRICAL SYSTEM:IGNITION · 14V355000
2014-06-23
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.
STEERING · 09E005000
2009-02-17
DORMAN IS RECALLING 979 STEERING KNUCKLES, DORMAN P/NOS. 697-902 AND 697-903, SOLD UNDER DORMAN'S "OE SOLUTIONS<SUP>TM</SUP>" BRAND NAME, AND NAPA P/NOS. 7-8502 AND 7-8503 WHICH WERE SOLD FOR REPLACEMENT USE ON THE VARIOUS VEHICLES LISTED ABOVE. A POTENTIAL MATERIAL OR DESIGN DEFECT COULD RESULT IN THE STEERING KNUCKLE BREAKING IN THE HUB AREA.
Consequence: A BROKEN STEERING KNUCKLE COULD RESULT IN LOSS OF STEERING CONTROL AND A POSSIBLE CRASH WITHOUT WARNING.
Remedy: DORMAN WILL NOTIFY OWNERS AND REPLACE THE DEFECTIVE STEERING KNUCKLES FREE OF CHARGE AND REIMBURSE THE REPAIR FACILITY OR OWNER FOR LABOR. THE RECALL BEGAN ON FEBRUARY 23, 2009. OWNERS MAY CONTACT DORMAN'S TOLL-FREE HOTLINE AT 1-800-523-2492 AND PRESS 5.
AIR BAGS:FRONTAL · 06V417000
2006-10-31
CERTAIN VEHICLES ORIGINALLY BUILT WITH CLOTH SEATS THAT WERE EQUIPPED WITH AN AUTOMATIC AIR BAG PASSENGER SENSING SYSTEM AND LATER REUPHOLSTERED WITH AFTERMARKET LEATHER SEAT COVER KITS ARE INVOLVED. TESTING HAS INDICATED THAT THE AFTERMARKET LEATHER SEAT COVERS CAN CAUSE THE PASSENGER SENSING SYSTEM TO MALFUNCTION.
Consequence: IF THE PASSENGER SENSING SYSTEM MALFUNCTIONS, THE FRONT AIR BAG ON THE PASSENGER SIDE MAY BE DISABLED WHEN IT SHOULD BE ENABLED, OR ENABLED WHEN IT SHOULD BE DISABLED. IN EITHER CASE, IN THE EVENT OF A CRASH THAT REQUIRES AIR BAG DEPLOYMENT, A FRONT PASSENGER'S LEVEL OF INJURY MAY BE INCREASED.
Remedy: BECAUSE A REPLACEMENT LEATHER SEAT COVER THAT IS COMPATIBLE WITH THE PASSENGER SENSING SYSTEM IS NOT AVAILABLE, GENERAL MOTORS (GM) WILL REPURCHASE THESE VEHICLES IN ACCORDANCE WITH THE TERMS STATED IN GM'S LETTER TO OWNERS. THE RECALL BEGAN ON NOVEMBER 6, 2006. OWNERS SHOULD CONTACT GM AT 1-877-477-1022 TO BEGIN THE PROCESS OF REPURCHASING THEIR VEHICLE.
Fuel economy (EPA)
City
17mpg
Highway
28mpg
Combined
21mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Midsize Cars
Wiper blades
First generation (2005-2009). Sedan body style has no rear wiper.
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 2006 Buick LaCrosse 3.8L V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.