The 2017 Enclave is the final year of the first-generation Lambda platform with the direct-injected 3.6L V6. While comfortable and spacious, this generation suffers from catastrophic engine failures and transmission cooler line issues that can drain your wallet fast.
Catastrophic 3.6L V6 Timing Chain Failure
Occasional · high severityTypical onset: 80,000-150,000 mi
Symptoms: Rattling noise on cold start that disappears after warm-up, Check engine light with timing correlation codes (P0008, P0009, P0010), Sudden loss of power or no-start condition, Metal shavings in oil from stretched chain destroying guides
Fix: Timing chain, guides, tensioners, and often cam phasers must be replaced. Frequently discovers additional damage requiring complete engine rebuild or replacement. 12-18 hours labor for chain service alone; 25-35 hours for full rebuild.
Estimated cost: $3,500-9,500
Transmission Oil Cooler Line Leaks
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Transmission fluid puddles under vehicle near radiator area, Pink or red fluid visible on cooler lines at crimped connections, Harsh shifting or slipping from low fluid level, Overheating transmission if leak goes unnoticed
Fix: Factory crimped cooler lines fail at connections. Requires replacement of both feed and return lines from transmission to radiator. Some shops install braided aftermarket lines for durability. 2-3 hours labor plus fluid flush.
Estimated cost: $450-850
Piston Ring Carbon Buildup and Oil Consumption
Common · medium severityTypical onset: 70,000-130,000 mi
Symptoms: Excessive oil consumption (1 quart per 1,000-2,000 miles), Blue smoke from exhaust on startup or acceleration, Carbon buildup on intake valves causing rough idle, P0300-P0306 misfire codes from fouled plugs
Fix: Direct injection combined with weak PCV design allows carbon to pack piston ring lands. Walnut blasting intake valves helps temporarily (3-4 hours). Full fix requires engine removal, piston ring replacement, and decarbonizing. 22-28 hours labor.
Estimated cost: $4,500-7,500
Front Transmission Mount Failure
Common · low severityTypical onset: 80,000-140,000 mi
Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration through steering wheel at idle in Drive, Visible separation or cracking in rubber mount during inspection
Fix: Hydraulic transmission mount deteriorates from heat and engine torque. Simple replacement but requires supporting engine and transmission. 1.5-2 hours labor.
Estimated cost: $250-450
Water Pump Failure
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: Coolant leak from weep hole on pump body, Whining or grinding noise from front of engine, Overheating or fluctuating temperature gauge, Steam from under hood in severe cases
Fix: Water pump is buried behind timing cover requiring significant disassembly. Smart move is replacing timing chains simultaneously if mileage is over 100k. Water pump alone: 4-5 hours. Combined with timing service adds 2-3 additional hours.
Estimated cost: $800-1,400
AC Condenser Corrosion and Leaks
Occasional · medium severitySymptoms: AC blows warm air or intermittently cools, Low refrigerant discovered during recharge, Visible corrosion on front-facing condenser behind grille, Oily residue on condenser surface from refrigerant leak
Fix: Aluminum condenser corrodes from road salt and debris. Located in front of radiator requiring bumper cover and grille removal. Must evacuate system, replace condenser, receiver/dryer, and recharge. 3-4 hours labor.
Estimated cost: $700-1,200
Pass unless you find a meticulously maintained low-mileage example under $12k — timing chain and transmission cooler line failures make this a liability after 80,000 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.