The 2021 Maxima carries Nissan's CVT reliability concerns from prior generations, though being newer means fewer high-mileage failures documented yet. The VQ35DE is fundamentally solid, but the concerning repair database entries suggest catastrophic engine failures may be emerging as early builds age.
CVT Transmission Failure & Oil Cooler Leaks
Common · high severityTypical onset: 60,000-100,000 mi
Symptoms: Shuddering or juddering during acceleration, especially 15-40 mph, Whining or grinding noises from transmission, Check engine light with P0868 or P17F0 codes, Coolant/ATF mixing causing milky fluid
Fix: Oil cooler gasket failure is common entry point for bigger CVT problems. Cooler repair alone is 3-4 hours labor, but if CVT internals are contaminated or worn, you're looking at remanufactured CVT replacement at 8-12 hours labor. Transmission mount failure (2 hours) often accompanies this due to excessive vibration from failing CVT.
Estimated cost: $800-1,200 for cooler/mount; $4,500-7,500 for CVT replacement
Catastrophic Engine Failure - Piston/Bearing Damage
Occasional · high severityTypical onset: 80,000-120,000 mi
Symptoms: Severe knocking or ticking from bottom end, Metal shavings in oil, Sudden loss of oil pressure, Seized engine in worst cases
Fix: The repair database showing pistons, bearings, and crankshaft work suggests oil starvation or debris contamination issues causing bottom-end failure. Short block replacement is 18-24 hours labor; full engine rebuild with head gasket work pushes 30-35 hours. These aren't routine maintenance items—this indicates systematic failures.
Estimated cost: $6,000-9,000 short block; $8,000-12,000+ complete rebuild
Fuel Filter Clogging (In-Tank Module)
Occasional · medium severityTypical onset: 70,000-100,000 mi
Symptoms: Hard starting, especially when hot, Intermittent stalling or stumbling under load, Loss of power at highway speeds, P0087 fuel pressure codes
Fix: Filter is part of fuel pump assembly in tank. Requires tank drop (2.5-3.5 hours labor). Some techs see premature clogging possibly related to fuel system contamination or poor fuel quality in certain markets. Not as simple as spin-on external filter.
Estimated cost: $500-900
Transmission Mount Failure
Common · low severityTypical onset: 50,000-80,000 mi
Symptoms: Excessive vibration at idle in Drive, Clunking when shifting from Park to Drive/Reverse, Engine movement visible when accelerating
Fix: CVT transmissions create unique harmonics that eat mounts faster than traditional automatics. Right-side mount most common failure. Straightforward 2-hour replacement, but check all mounts while you're there. Often masks or accelerates CVT problems.
Estimated cost: $300-500
Hard pass on used examples without comprehensive service records—the CVT and emerging engine failures make this a ticking time bomb after warranty expires.
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.