The 2021 NSX is a low-production hybrid supercar with a complex twin-turbo V6 plus three electric motors. Most units see light duty and low mileage, but the few high-mileage or track-driven examples reveal expensive powertrain vulnerabilities—especially bearing and piston failures tied to sustained high-load operation.
Connecting Rod and Main Bearing Failure
Occasional · high severityTypical onset: 30,000-60,000 mi under track or high-performance use
Symptoms: Metallic knocking or ticking at idle or under load, Low oil pressure warning, Metal debris in oil filter, Catastrophic engine seizure if ignored
Fix: Requires full engine teardown—bottom-end rebuild or short block replacement. 35-50 labor hours depending on whether you salvage the block. Cylinders may need boring if debris scored the walls.
Estimated cost: $18,000-35,000
Piston Ring Land Cracking and Blow-By
Occasional · high severityTypical onset: 40,000-70,000 mi, accelerated by track abuse or sustained boost
Symptoms: Excessive oil consumption (1+ qt per 1,000 mi), Blue smoke on deceleration, Loss of compression in one or more cylinders, Rough idle and misfires
Fix: Engine-out, heads off, complete piston and ring replacement. Often pair with honing and new bearings. 40-55 labor hours. If cylinder walls are damaged, short block is the only fix.
Estimated cost: $15,000-28,000
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 25,000-50,000 mi
Symptoms: Transmission fluid spots on garage floor, Burning smell after spirited driving, Transmission overheating warning on track, Visible seepage at hard-line fittings
Fix: Lines or O-rings at the cooler connections fail from heat cycling. 4-6 labor hours to access, replace lines and seals, refill, and bleed the DCT. Not a big job, but access is tight.
Estimated cost: $800-1,500
Rear Transmission Mount Deterioration
Occasional · low severityTypical onset: 40,000-70,000 mi
Symptoms: Clunking when shifting gears or launching hard, Excessive driveline vibration under acceleration, Visible cracking or separation of rubber isolator
Fix: The rear DCT mount takes abuse from torque and electric-motor transients. Replace mount and hardware. 2-3 labor hours with car on lift.
Estimated cost: $600-1,000
Hybrid Battery Pack Thermal Management Issues
Rare · high severitySymptoms: "Service hybrid system" warning, Reduced electric-only range, Overheat warnings in hot weather or track sessions, Inability to charge hybrid battery
Fix: Cooling pump or control module failure in the battery pack. Diagnosis is dealer-level work; pack removal and repair can run 12-18 hours. Some owners have had entire packs replaced under goodwill.
Estimated cost: $8,000-18,000
Head Gasket Failure from Overboost or Detonation
Rare · high severityTypical onset: 50,000+ mi, usually after aftermarket tuning or track abuse
Symptoms: Coolant loss with no visible leaks, White exhaust smoke, Oil milkshake in reservoir or on dipstick, Overheating and rough running
Fix: Engine-out or in-chassis heads-off job. Both heads, gaskets, ARP studs recommended, plus machine work if warped. 30-40 labor hours. Often discovered during bearing or piston repairs.
Estimated cost: $12,000-20,000
Stunning to drive, but only buy if you have a $20k repair fund and access to a competent Acura performance shop—this is not a DIY-friendly platform, and catastrophic engine failures are real on high-mile or abused examples.
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.