The 2021 Enclave rides on GM's C1XX platform with the proven 3.6L V6 and 9-speed automatic. While newer than the notorious timing-chain issues of earlier models, this generation still sees specific transmission and engine oil-consumption concerns that can get expensive if ignored.
Transmission Oil Cooler Line Leaks and Failure
Common · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Transmission fluid pooling under vehicle, often pink or red fluid, Harsh or delayed shifting when transmission runs low on fluid, Check engine light with transmission temp codes, Transmission slipping or shuddering under acceleration
Fix: Replace transmission oil cooler lines and cooler assembly. Often requires dropping subframe for access. 4-6 labor hours depending on rust and clearance. Flush transmission if contamination suspected.
Estimated cost: $800-1,500
Excessive Oil Consumption and Piston Ring Failure
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Low oil warning light coming on between oil changes, burning 1+ quart per 1,000 miles, Blue smoke from exhaust on cold start or acceleration, Fouled spark plugs causing rough idle or misfire codes, Loss of power and poor fuel economy
Fix: Requires engine disassembly to replace piston rings, often pistons themselves if carbon buildup severe. Many shops recommend short-block replacement instead of rebuild on high-mileage units. 20-30 labor hours for full engine rebuild, 12-16 for short block swap.
Estimated cost: $4,500-8,000
9-Speed Automatic Transmission Shudder and Torque Converter Issues
Common · medium severity
Typical onset: 30,000-70,000 mi
Symptoms: Vibration or shudder when accelerating between 25-45 mph, especially uphill, Hesitation or clunking when downshifting to a stop, Transmission hunting between gears on slight grades, Occasional hard shifts from 2nd to 3rd gear
Fix: GM issued TSBs for fluid and software updates first. Many cases require torque converter replacement if shudder persists. Transmission mount replacement also common. Fluid update: 2 hours. Torque converter: 8-12 hours with transmission removal.
Estimated cost: $200-3,500
Timing Chain Stretch and Actuator Failure (Carryover Risk)
Rare · high severity
Typical onset: 100,000+ mi
Symptoms: Rattling noise from engine on cold start, lasting 5-10 seconds, Check engine light with cam/crank correlation codes (P0017, P0008), Rough idle and reduced power, Engine may not start if timing severely off
Fix: Replace timing chains, guides, tensioners, and cam actuators. Requires front engine disassembly. Earlier 3.6L engines (pre-2017) were notorious for this; 2021s improved but not immune. 12-16 labor hours.
Estimated cost: $2,800-4,200
Electronic Parking Brake Module Failure
Occasional · medium severity
Symptoms: Parking brake warning light stays on or flashes, Unable to release parking brake, requiring manual override, Grinding or whining noise from rear brakes when engaging parking brake, Service parking brake message on dash
Fix: Replace electronic parking brake actuator or control module. Often corrosion-related in salt states. 2-3 hours per side for actuator, 1.5 hours for module.
Estimated cost: $600-1,200
EVAP System Purge Valve and Canister Issues
Occasional · low severity
Typical onset: 50,000-90,000 mi
Symptoms: Check engine light with EVAP codes (P0496, P0442), Fuel smell near vehicle, especially after filling tank, Difficulty filling gas tank, pump clicking off repeatedly, Rough idle when engine is warm
Fix: Replace purge valve or charcoal canister. Purge valve is accessible near intake, 0.5-1 hour. Canister requires raising vehicle and removing fuel tank shields, 2-3 hours.
Estimated cost: $200-800
Owner tips
Check oil level every 1,000 miles if over 50k — the 3.6L can develop consumption issues with no warning
Use GM-specified Dexron HP fluid for the 9-speed and change at 45k intervals despite 'lifetime' claims
Inspect transmission cooler lines annually for seepage; catch leaks early before costly damage
Solid family hauler if under 60k miles with service records, but budget $1,500-2,000 for potential transmission work and watch oil consumption like a hawk — that 3.6L can turn expensive fast.
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: H6/Group 48 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 2020-2022 Chevrolet Traverse and 2021-2022 Buick Enclave vehicles. The harness connector to the left or right side roof rail air bag may have incompatible electrical terminals, which could prevent the air bags from deploying in a crash.
Consequence: Roof rail air bags that do not deploy as intended increase the risk of injury in a crash.
Remedy: Dealers will replace the harness connector to the roof rail air bags, free of charge. Owner notification letters were mailed on April 29, 2022. Owners may contact Buick customer service at 1-800-521-7300 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N212352140.
AIR BAGS:SENSOR:FRONTAL IMPACT · 21V472000
2021-06-24
General Motors, LLC (GM) is recalling certain 2021 Chevrolet Traverse and Buick Enclave vehicles. During service by dealers, certain vehicles may have received incorrect air bag calibration software that may affect frontal airbag deployment.
Consequence: Air bags that do not deploy as intended can increase the risk of injury.
Remedy: Dealers will update the air bag calibration software, free of charge. Owner notification letters were mailed on July 29, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020 and Buick customer service at 1-800-521-7300. GM's number for this recall is N212340220.
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 2021 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 Lexus & Toyota Mechanic · 20+ years.