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 severity
Typical 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
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 severity
Typical 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 severity
Typical 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
Owner tips
CVT fluid changes every 30,000 miles are non-negotiable—Nissan says 'lifetime' but real world says otherwise if you want to see 150k
Check oil level religiously and use Nissan-spec 0W-20 only; oil consumption and starvation may be behind engine failures
Inspect transmission oil cooler lines and gaskets at every service after 50k miles
For used purchases, demand CVT fluid analysis and compression test—walk away from anything with questionable history
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.
Fitment notes: Battery located in trunk; AGM type required for electrical system
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Every control module on the 2018-2023 Nissan Maxima — 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.
📍 Inside transmission case, integrated with valve body (CVT models)
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Requires transmission removal and disassembly; VIN programming and adaptive value initialization mandatory; CVT fluid replacement required during R&R
Electric Power Steering Control Module (EPS)2.5 hr R&Rdealer / factory tool +0.6 hr▸ programming details
📍 Steering column, integrated with steering gear assembly at base of column
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Steering angle sensor calibration and neutral position learning required; VIN programming mandatory; some aftermarket tools can perform calibration but programming may require dealer
Radar Control Module (RADAR)2.0 hr R&Rdealer / factory tool +1.5 hrwith ProPILOT Assist or Intelligent Cruise Control▸ programming details
📍 Front bumper, center behind lower grille opening
🔧 CONSULT-III Plus with NTIS subscription and alignment targets
⚠️ Radar aiming and calibration mandatory after replacement or front-end collision; requires specific alignment targets and clear 20-foot path; bumper removal required for access
Anti-lock Brake System Control Module (ABS)1.8 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Engine bay, driver side inner fender well, mounted to ABS hydraulic unit
🔧 CONSULT-III Plus or Autel/Launch scan tool
⚠️ Brake bleeding required after replacement; steering angle sensor calibration and vehicle dynamics initialization required; most aftermarket tools can perform relearn
Automatic Air Conditioning Control Module (A/C)1.8 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Behind center stack, integrated with HVAC control panel assembly
🔧 CONSULT-III Plus or aftermarket scan tool
⚠️ Self-diagnosis and actuator initialization required after replacement; most aftermarket tools can perform relearn
Body Control Module (BCM)1.5 hr R&Rdealer / factory tool +1.2 hr▸ programming details
📍 Behind driver side lower dash panel, above fuse box
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Controls lighting, door locks, wipers, horn; VIN and configuration programming required; key registration must be performed after replacement; some aftermarket tools can code but key functions may require dealer
Around View Monitor Control Module (AVM)1.5 hr R&Rdealer / factory tool +1.0 hrwith Around View Monitor (Intelligent Around View Monitor on Premium trims)▸ programming details
📍 Behind center stack, mounted to AVN unit bracket
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Camera calibration and image stitching configuration required; four cameras (front, rear, both mirrors); moving object detection on Premium models requires additional calibration
Adaptive Front Lighting System Control Module (AFS)1.5 hr R&Rrelearn only +0.4 hrwith LED headlights and adaptive lighting▸ programming details
📍 Behind front bumper, driver side headlight assembly mounting area
🔧 CONSULT-III Plus or aftermarket scan tool
⚠️ Headlight aiming and leveling calibration required; steering angle sensor data used for cornering function; most aftermarket tools can perform calibration
📍 Engine bay, driver side fender well, integrated with Intelligent Power Distribution Module
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Immobilizer and Intelligent Key functions integrated; all keys must be re-registered after replacement; VIN and security programming required; some high-end aftermarket tools (Autel IM608, Advanced Diagnostics) can program keys but module replacement typically requires dealer
Blind Spot Warning Control Module (BSW)1.3 hr R&Rrelearn only +0.4 hrwith Blind Spot Warning (most SR and all SV/SL/Platinum trims)▸ programming details
📍 Rear bumper, driver side behind bumper cover
🔧 CONSULT-III Plus or aftermarket scan tool
⚠️ Radar sensor calibration required; two sensors (one each side) managed by single module; rear bumper removal required; most aftermarket tools can perform calibration
📍 Behind driver side lower dash panel, mounted to BCM bracket
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Manages CAN bus communication between networks; VIN and network configuration programming required; failure can cause multiple system communication faults
📍 Engine bay, driver side firewall, mounted on bulkhead above brake master cylinder
🔧 CONSULT-III Plus with NTIS subscription
⚠️ VIN programming and immobilizer pairing required; some aftermarket tools (Autel MaxiSys Elite, Launch X431) can program with J2534 pass-through but success varies by model year
Intelligent Power Distribution Module (IPDM)1.2 hr R&Rdealer / factory tool +0.6 hr▸ programming details
📍 Engine bay, driver side fender well, mounted to inner fender panel
🔧 CONSULT-III Plus with NTIS subscription
⚠️ Controls fuel pump, cooling fans, and multiple power distribution functions; VIN and configuration programming required; integrates with NATS immobilizer
Audio Visual Navigation Unit (AVN)1.2 hr R&Rrelearn only +0.3 hr▸ programming details
📍 Center stack, integrated touchscreen unit
🔧 CONSULT-III Plus or aftermarket scan tool
⚠️ VIN registration and camera calibration required on models with Around View Monitor; Bluetooth and audio settings require user setup; navigation SD card separate
Supplemental Restraint System Control Module (SRS)1.0 hr R&Rdealer / factory tool +0.5 hr▸ programming details
📍 Center console, beneath center stack trim, forward of shifter
🔧 CONSULT-III Plus with NTIS subscription
⚠️ VIN programming required; crash data must be cleared; occupant classification system calibration required; battery disconnect mandatory before removal
Sonar Control Module (SONAR)1.0 hr R&Rrelearn only +0.3 hrwith parking sensors▸ programming details
📍 Rear cargo area, driver side trim panel behind wheel well
🔧 CONSULT-III Plus or aftermarket scan tool
⚠️ Sensor calibration and self-diagnosis required; front and rear sensors managed by single module; most aftermarket tools can perform relearn
Telematics Control Unit (TCU)1.0 hr R&Rdealer / factory tool +0.8 hrwith NissanConnect Services▸ programming details
📍 Behind glove box, upper right side of HVAC housing
🔧 CONSULT-III Plus with NTIS subscription and NissanConnect activation
⚠️ Requires dealer activation and subscription setup; VIN and cellular carrier provisioning required; not all trim levels equipped
⚠️ Mileage programming required by law; VIN and configuration data must be transferred; some aftermarket tools claim mileage programming but legal compliance questionable
Power Window Master Switch (PWMS)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Driver door, integrated with master window switch assembly
🔧 Manual initialization procedure or scan tool
⚠️ Window auto-up/down initialization required after replacement; can be performed manually without scan tool by cycling windows; controls all four windows
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.
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 Nissan Maxima 3.5L V6 VQ35DE 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.