Thermostat failure at 56,000 miles.
2018 buick LaCrosse engine problems
moderate 3 complaints filed with NHTSA · avg repair $3,100
Complaints
3
Recalls
0
Crashes
0
Avg fix
$3,100
What owners are reporting 3 most recent
IF STOPPED UPHILL AND THE AUTO STOP ACTIVATES, WHEN YOU RELEASE THE BRAKE THE CAR CAN ROLL BACK, AND THE WAY PEOPLE STOP ON TOP OF YOU THESE DAYS YOUR CAR CAN ROLL BACK INTO THEM AND YOU HAVE TO REPAIR THEIR CAR. PLUS IT ACTUALLY TAKES MORE GAS THAN MY V8 2016 GMC SIERRA THAT DOESN'T STOP WHEN TRAVELING FROM MY FUELING LOCATION TO MY HOME, PER THE CARS OWN COMPUTER SYSTEM
The 3.6 liter engine in my 2018 Buick Lacrosse Avenir only has 53,939 when we experienced a thermostat failure. The engine temperature was dead cold, and the dual electric fans were running non-stop. When I scanned the trouble code, I found PO128 which points to a faulty thermostat. Because the thermostat is buried under the intake manifold, we had the local Buick dealership replace it at a cos…
Common questions
How serious is the engine problem on the 2018 buick LaCrosse?
It's a documented issue but not catastrophic. 3 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?
Mileage data is limited for this issue. Owners report failures across a wide range, suggesting cause is more about driving conditions and maintenance than mileage alone.
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.
Other problem areas on this vehicle
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. 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.
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