The 2019 Buick Enclave uses GM's 3.6L High-Feature V6 paired with a 9-speed automatic. While the drivetrain is shared across several platforms, this generation shows troubling patterns with engine internals and transmission cooling that can lead to catastrophic failures if ignored.
3.6L V6 Timing Chain Wear and Piston Ring Failure
Occasional · high severity
Typical onset: 80,000-140,000 mi
Symptoms: Excessive oil consumption (1 qt per 1,000 mi or more), Cold-start rattle lasting 2-5 seconds, Check engine light with misfires (P0300-P0306), Blue smoke on startup or hard acceleration
Fix: GM's timing chain tensioner design allows slack that accelerates cam phaser and chain guide wear. Combined with known piston ring land issues, many engines need rings, chains, and phasers by 100k. Complete job is 18-24 labor hours for internal work. Severe cases require short block replacement at 28-32 hours.
Estimated cost: $4,500-8,500
9-Speed Automatic Transmission Oil Cooler Line Leaks
Common · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Transmission fluid pooling under vehicle center section, Low fluid warning or transmission slipping, Pink fluid visible on radiator support or frame rails, Harsh shifts or delayed engagement when fluid gets low
Fix: The steel cooler lines corrode at the crimped fittings where they connect to the transmission and radiator. Once they leak, transmission damage happens fast. Line replacement requires raising the vehicle, sometimes dropping exhaust. 3-4 hours labor. This is a known recall item (NHTSA 21V-838) but check if your VIN was covered. If not covered, you're paying out of pocket.
Estimated cost: $600-1,200
Transmission Mount Failure (Rear/Center)
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive that disappears in Neutral, Excessive drivetrain movement visible when rocking vehicle in gear
Fix: The rear transmission mount separates internally, allowing the heavy 9-speed to move excessively. This accelerates wear on CV axles and shift linkage. Mount replacement requires supporting the transmission and removing through bolts. 2-2.5 hours labor. Common wear item on heavier crossovers with this trans.
Estimated cost: $400-650
High-Pressure Fuel Pump Failure
Occasional · high severity
Typical onset: 50,000-90,000 mi
Symptoms: Hard starting or extended cranking when engine is hot, Loss of power under acceleration (limp mode), P0087 code (fuel rail pressure too low), Engine stumble or stall at idle after driving
Fix: The cam-driven high-pressure fuel pump on the 3.6L can fail internally, dumping metal debris into the fuel system. If you catch it early, pump replacement alone is 3-4 hours (pump is under intake manifold). If metal contaminated the system, you're adding injectors and fuel rail cleaning for 8-10 hours total. Always replace fuel filter and flush lines when doing this pump.
Estimated cost: $1,200-3,800
Crankshaft Position Sensor Intermittent Failure
Occasional · high severity
Symptoms: Random no-start, cranks but won't fire, Stalling while driving with no restart, P0335 or P0336 codes (CKP sensor circuit), Tachometer drops to zero while driving
Fix: Sensor itself is cheap, but it's buried behind the starter on the rear of the block. Access requires removing starter and working blind with extensions. Heat cycles cause the sensor to fail intermittently. 1.5-2 hours labor. Always inspect the reluctor ring on the crank for damage while you're in there — rare but catastrophic if the ring has shifted.
Estimated cost: $250-450
Owner tips
Change transmission fluid every 50k miles despite GM saying 'lifetime' — this 9-speed runs hot and fluid breaks down
Monitor oil consumption religiously from 60k onward; if you're adding more than 1 qt between changes, address it before rings glaze completely
Inspect transmission cooler lines annually for surface rust starting at 50k — catching a weep early saves the transmission
Use only Dexos-approved oil and change at 5k intervals to give the timing chain system a fighting chance
Buy only with full service records showing religious oil changes and transmission services; budget $2-3k reserve for likely engine or trans work by 100k miles.
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: Group 48 H6 AGM battery; located under rear cargo floor
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Every control module on the 2018-2026 Buick Enclave — 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 Control Module (SCM)0.7 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Under driver or passenger seat
🔧 GDS2 memory relearn
⚠️ Memory seat position relearn required
Rear Vision Camera Module (RVCM)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Integrated with liftgate handle or rear bumper
🔧 GDS2 camera calibration
⚠️ Camera alignment calibration may be needed; 2020+ models have HD cameras
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 2018-2019 Chevrolet Cruze and Buick LaCrosse, 2018-2020 Chevrolet Equinox, Chevrolet Traverse and GMC Terrain, 2018 Chevrolet Malibu, 2019-2020 Buick Encore, Buick Enclave, Cadillac XT4, Chevrolet Blazer and GMC Acadia, and 2020 Cadillac XT6 vehicles. The start/stop accumulator endcap may have missing bolts.
Consequence: Missing bolts on the start-stop accumulator endcap could result in a transmission oil leak and may progress to a loss of propulsion, increasing the risk of a crash. A transmission fluid leak in the presence of an ignition source may increase the risk of fire.
Remedy: GM will notify owners, and dealers will inspect the start-stop transmission accumulator and replace it if any bolts are missing, free of charge. The recall began December 15, 2020. Owners may contact GMC customer service at 1-888-988-7267, Buick Customer service at 1-866-608-8080, Chevrolet customer service at 1-800-222-1020 or Cadillac customer service at 1-800-458-8006. GM's number for this recall is N202313440.
Fuel economy (EPA)
City
18mpg
Highway
26mpg
Combined
21mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Standard Sport Utility Vehicle 2WD
Wiper blades
Second generation (2018-2024). Both front blades are 24 inches.
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 2019 Buick Enclave 3.6L 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.