2018 BUICK ENVISION

Typical onset: 40,000-80,000 mi

Symptoms: Excessive oil consumption (1 qt per 1,000 mi or worse), Blue smoke from exhaust on startup or acceleration, Misfires, rough idle, check engine light for multiple cylinder misfires, Complete loss of compression leading to no-start condition

Fix: Requires full engine rebuild or replacement due to defective piston rings allowing oil into combustion chambers and severe carbon deposits. 18-24 labor hours for short block replacement, or 25-32 hours for complete rebuild with machine work. GM issued TSB but no recall — often denied warranty coverage after 60k.

Estimated cost: $6,500-11,000

Typical onset: 50,000-90,000 mi

Symptoms: Transmission fluid leak under vehicle, typically passenger side, Transmission overheating warning on dash, Harsh shifting or slipping if fluid level drops significantly, Pink or red fluid pooling in driveway

Fix: Cooler lines corrode and fracture where they connect to radiator or transmission. Requires line replacement, often both feed and return lines preventively. 2.5-4 hours labor depending on access. Critical to address immediately to prevent transmission damage from fluid loss.

Estimated cost: $450-850

Typical onset: 60,000-100,000 mi

Symptoms: Clunking or banging when shifting from Park to Drive/Reverse, Vibration felt through cabin at idle or during acceleration, Visible movement of engine/trans when revving in Park, Rough engagement during gear changes

Fix: The passenger-side transmission mount deteriorates from heat and stress of the 9-speed's shifting behavior. Replacement requires supporting powertrain and takes 2-3 hours. Recommend inspecting all motor mounts simultaneously as they age together.

Estimated cost: $350-600

Typical onset: 70,000-110,000 mi

Symptoms: Hard starting or extended cranking, especially when tank is below 1/4, Loss of power during acceleration or highway merging, Intermittent stalling at idle or low speeds, Check engine light with fuel pressure codes

Fix: In-tank fuel pump filter becomes restricted with debris, often from ethanol-related corrosion. Requires dropping fuel tank and replacing entire pump module assembly — GM doesn't sell filter separately. 3-4 hours labor. More common in areas with poor fuel quality or E85 exposure.

Estimated cost: $650-1,100

Typical onset: 60,000-120,000 mi

Symptoms: Rattling or buzzing noise from engine bay on cold starts, Noise disappears after 30-60 seconds of warm-up, No performance loss or check engine light in early stages, Eventually may trigger underboost codes if actuator fails

Fix: Wastegate actuator arm develops play, causing characteristic rattle until oil pressure builds. Turbo replacement required if it progresses to actuator failure, 6-8 hours labor. Often just a noise nuisance for years before actual failure.

Estimated cost: $1,800-2,800

Typical onset: 80,000-130,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust, sweet smell, Overheating episodes, bubbling in coolant reservoir, Milky oil on dipstick or oil cap (if severe)

Fix: Related to the same overheating issues from piston ring failures — combustion pressure breaches head gasket. Both heads typically done together, 14-18 hours labor. Machine shop resurfacing required. Often discovered during diagnosis of the piston ring problem.

Estimated cost: $2,800-4,500