This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗2005 Buick LaCrosse engine problems
moderate 11 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
11
Recalls
0
Avg fix
$3,100
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 carbon build-up.
full bulletin at 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 carbon build-up.
full bulletin at 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.
full bulletin at 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 retention and proper handling of assembly returns for Canadian Dealers only.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Stalling at speed is the main complaint across these 11 reports. Owners describe complete power loss while cruising at 20–73 mph with little to no warning; the engine dies and requires 2–3 minutes or multiple restart attempts to fire again. In some cases, the check engine light does not illuminate before the stall—it appears only after the car dies, then vanishes when the engine restarts, leaving no code for diagnosis. GM has told owners to keep driving until the light stays on, a directive owners consider dangerous.
One owner replaced a brand-new battery at a GM dealer the same day the stalling recurred. Another owner had a catalytic converter, oxygen sensor, and later a mass air flow unit replaced at independent shops, totaling over $880, yet the stalling persisted. Dealers have been unable to identify the root cause in multiple cases.
Beyond stalling, owners report dangerous hesitation during acceleration and passing—the engine feels like it will stall when the pedal is pressed, with a delayed response of several seconds. One owner also reported smoke under the hood with a burning wire smell; the dealer replaced the coil and spark plugs, but the vehicle then refused to start, and an independent mechanic found an engine control module failure.
Separate complaints note excessive oil consumption from as early as 25,000 miles, a blocked intake valve at 37,000 miles, and one attribution to Dexcool antifreeze causing valve deterioration. The dealer declined to service the oil-consumption problem without proof of consumption exceeding 1 quart per 2,000 miles.
Same Buick LaCrosse engine reports on nearby years: 2007
Failure modes owners describe
Stalling at speed without warning
Engine cuts power and stalls while driving at highway or moderate speeds (20–73 mph), with little to no warning. Vehicle restarts after several minutes or attempts. No check engine light illuminates before stall in some cases; light may appear after stall and extinguish once restarted.
When: 25,000–90,000 miles
Symptoms owners cite: Complete loss of power while cruising; No warning lights before stall; Check engine light may appear after stall, then disappear; Requires 2–3 minutes or multiple restart attempts; Recurs on multiple occasions
Repairs/costs cited: One owner had battery replaced at GM dealer with no resolution. Another had catalytic converter and oxygen sensor replaced ($750.47), then mass air flow unit and sensor replaced ($131.39); stalling recurred after both repairs. Dealers unable to diagnose in some cases.
Recalls/TSBs owners mention: GM issued case number but advised owner to continue driving until check engine light stays on for diagnosis. GM cited expired warranty (7-year-old vehicle) and declined loaner car assistance.
Hesitation and delayed throttle response under acceleration
Engine hesitates or fails to respond immediately when accelerator is pressed, particularly during acceleration, ramp entry, or passing maneuvers. Vehicle feels like it wants to stall before power kicks in.
When: Mileage not stated
Symptoms owners cite: Delayed response to throttle input; Engine feels like it will stall during acceleration; Foot on pedal but car does not respond for several seconds; Dangerous during highway entry and passing
Smoke, burning smell, and engine control module failure
Smoke appears under hood accompanied by burning wire smell. Dealer replaces coil and spark plugs, but vehicle fails to start afterward. Independent mechanic diagnoses engine control module problem; vehicle not repaired.
When: 107,159 miles
Symptoms owners cite: Smoke under hood; Burning wire smell; No warning indicator illuminated; Vehicle fails to start after initial repair
Repairs/costs cited: Coil and spark plugs replaced by dealer; no resolution. Engine control module issue identified but vehicle not repaired.
Excessive oil consumption
Oil level drops steadily with each drive cycle. Dealer refuses service, stating vehicle must consume more than 1 quart per 2,000 miles before action can be taken.
When: 25,000–27,340 miles
Symptoms owners cite: Steady decline in oil level; Issue present from early in vehicle life
Repairs/costs cited: No service performed. Dealer set consumption threshold at 1 quart per 2,000 miles before addressing.
Blocked intake valve and Dexcool-related corrosion
Oil warning light illuminates due to blocked intake valve. Mechanic reports risk of engine damage if not corrected. Owner attributes issue to Dexcool antifreeze causing valve deterioration.
When: 37,063 miles
Symptoms owners cite: Oil warning light illumination; Blocked intake valve; Risk of engine ruin per mechanic
Synthesized from 11 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2005 Buick LaCrosse?
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 2005 Buick LaCrosse?
It's a documented issue but not catastrophic. 11 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 8 complaints that reported odometer mileage, most engine failures cluster between 33,600 and 90,000 miles, with the median around 42,000. A quarter of owners report trouble before 33,600; a quarter make it past 90,000. 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/2005/Buick/LaCrosse.
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.