This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
View on NHTSA →2006 Buick Lucerne engine problems
moderate 21 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
21
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 21 engine complaints filed for the 2006 Buick Lucerne, here's the actual mileage breakdown — failures cluster heaviest at 150,000+ mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 6 model years of Buick Lucerne we track for engine problems, this one carries the most owner complaints on file — 21.
No new NHTSA engine complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce c
View on NHTSA →This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce
View on NHTSA →This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
View on NHTSA →This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record reten
View on NHTSA →Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2006 Lucerne's engine has two dominant failure patterns: random stalling and component degradation.
Stalling happens without warning at any speed—6 mph at a stop, 60 mph on the interstate, 70 mph on highways—with complete loss of engine power but retained steering and brakes. Owners restart after variable wait times, then stalling recurs unpredictably. No check engine light appears in some cases, preventing code-based diagnosis. Dealers have replaced crankshaft position sensors (some owners twice or three times on the same car), oxygen sensors, coil pack connectors, and entire wiring harnesses—yet stalling continues.
Motor mounts deteriorate early, causing violent shake especially during acceleration. Unlike typical vehicles where bolts can be re-tightened, the Lucerne requires complete mount replacement because the design lacks bolts. Three or four mounts fail simultaneously.
The aluminum V8 develops chronic, progressive oil leaks from multiple sealing points, producing smoke and burning smell inside the cabin. One owner reported diagnosis suggesting complete engine replacement is required. Others suspect bolt loosening requires engine removal to retorque.
One stall event traced back to the wiring harness migrating into the intake manifold at 6,000 miles and burning against hot surfaces. A drive belt separated at 45 mph, disabling power steering. Electrical routing from Cadillac chassis components created elevated magnetic fields in the passenger compartment.
Same Buick Lucerne engine reports on nearby years: 2007 · 2008
Failure modes owners describe
Random engine stall while driving
Engine cuts out completely without warning at various speeds, including highway speeds. Power steering and brakes remain functional initially, but the vehicle loses all power. Restart is possible after waiting variable amounts of time, then stalling recurs intermittently. Occurs even when no check engine light is present and no diagnostic codes are set.
When: Documented from early miles (660 miles) through 160,000 miles; appears across the vehicle's lifespan
Symptoms owners cite: Complete engine shutdown while driving; Loss of engine power while brakes and steering function; Vehicle unable to crank immediately after stall; Intermittent failures with no warning; No check engine light illumination in some cases
Codes mentioned: Ignition wire code, No codes set in some instances
Repairs/costs cited: Wiring harness replacement (burned wires and burned module); crankshaft position sensor replacement (repeated failures, replaced 2–3 times on same vehicle); oxygen sensor installation attempted; coil pack connector replacement; various dealer attempts unable to duplicate or resolve issue
Recalls/TSBs owners mention: Dealer unable to duplicate failure in multiple cases; GM rep directed owner to another dealership; no TSB or recall program mentioned; later model year vehicles reportedly repaired free of charge for similar motor mount issues
Engine mount failure and sagging
Motor mounts deteriorate and sag, causing violent engine shake and vibration, especially during acceleration from stop or turns. Unlike typical vehicle repairs, the 2006 Lucerne requires complete motor mount replacement rather than simple bolt replacement. Mounts lack bolts and cannot be serviced individually.
When: Reported at 58,000–80,000 miles
Symptoms owners cite: Violent engine shake and vibration; Excessive shaking during acceleration from stop; Engine vibration during turns; Visual sagging of motor mounts
Repairs/costs cited: Three or four engine mounts require replacement; Firestone and independent mechanics confirmed multiple mount failure; complete mount assembly replacement necessary; later model year vehicles received free repair for same issue
Recalls/TSBs owners mention: Manufacturer made aware; later model year Lucernes repaired free of charge for same failure; no reason provided for failure occurrence; TSBs referenced but not detailed
Head gasket failure
Head gasket fails, allowing oil to leak from engine. Owner reports diagnosis indicates complete engine replacement required due to extent of the leak.
When: Approximately 86,000 miles
Symptoms owners cite: Oil leaking from engine underneath vehicle; Progressive oil leakage
Repairs/costs cited: Independent mechanic diagnosis; owner reported engine replacement required; vehicle not repaired
Recalls/TSBs owners mention: Manufacturer notified; no recall or warranty program mentioned
Aluminum engine chronic oil leakage
Aluminum V8 engine develops progressive, severe oil leaks across multiple sealing surfaces. Leaks occur during all phases of operation and worsen over time, creating fire hazard as oil contacts hot exhaust manifold and produces smoke and odor. Owner suspects engine bolts have loosened and require retorquing, which demands engine removal.
When: First evident several years into ownership; progressive worsening
Symptoms owners cite: Profuse oil leaking from aluminum engine; Smoke and odor while driving; Oil dripping on hot exhaust manifold; Burning smell inside vehicle
Repairs/costs cited: Owner suspects engine bolt retorquing necessary; diagnosis: possible design flaw requiring correction; no repairs completed
Drive belt separation
Drive belt separates from engine while vehicle is in motion, causing immediate loss of engine-driven accessories including power steering, rendering steering wheel difficult or impossible to maneuver.
When: Incident at 45 mph
Symptoms owners cite: Drive belt comes off engine; Complete loss of power steering; Steering wheel becomes extremely hard to turn; Engine continues running but loses accessory drive
Repairs/costs cited: Vehicle towed to mechanic
Wiring harness migration and electrical damage
Motor wiring harness migrates from proper position into the intake manifold area where it contacts hot surfaces, burns the wire insulation, and damages downstream electrical components. Burned harness and burned electrical modules trigger engine shutdown and starting failures.
When: As early as 6,000 miles
Symptoms owners cite: Check engine light illumination; Engine shutdown; Starting failures; Repeated failure after repair
Repairs/costs cited: Wiring harness replacement and burned module replacement at dealer; failure recurred post-repair
Recalls/TSBs owners mention: Dealer repair completed August 2006
Engine bracket fracture
Engine mounting bracket fractures, causing jerking motion and abnormal noise while driving. Bracket replacement does not permanently resolve the issue; failure recurs.
When: Approximately 58,000 miles
Symptoms owners cite: Vehicle jerking while driving; Abnormal engine noise; Intermittent failures
Repairs/costs cited: Engine bracket replacement performed; failure recurred post-repair
Recalls/TSBs owners mention: Manufacturer notified
Starter motor engagement malfunction and electrical field issue
Starter motor stays engaged at unhealthy levels. Root cause identified as improper electrical wiring routing from Cadillac chassis design used in Lucerne, creating elevated electromagnetic fields inside passenger compartment.
When: <UNKNOWN>
Symptoms owners cite: Starter motor stays engaged abnormally; Elevated electromagnetic fields in passenger compartment
Repairs/costs cited: Diagnosis: Cadillac chassis wiring routing caused elevated magnetic fields
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Tl* the contact owns a 2006 Buick lucerne. The contact stated that while driving at an unknown speed, the vehicle stalled without warning. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was 160,000.
Had engine trouble with your 2006 Buick Lucerne?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2006 Buick Lucerne?
It's a documented issue but not catastrophic. 21 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 17 complaints that reported odometer mileage, most engine failures cluster between 41,000 and 99,000 miles, with the median around 74,000. A quarter of owners report trouble before 41,000; a quarter make it past 99,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2006/Buick/Lucerne.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.