The 2015 Nissan Leaf is mechanically simple with no engine or transmission in the traditional sense, but it's plagued by rapid battery degradation in hot climates and some onboard charger failures. Most documented 'transmission/engine' repairs in databases are data errors—this is a pure EV.
Rapid Battery Capacity Loss (Especially in Hot Climates)
Common · high severityTypical onset: 40,000-80,000 mi or 5-7 years
Symptoms: Range drops from original 84 miles to 50-60 miles on full charge, Loss of one or more capacity bars on dashboard gauge, Accelerated degradation in Arizona, Texas, Southern California, Battery State of Health (SOH) below 70% on diagnostic scan
Fix: Battery replacement requires 6-8 hours labor for pack removal and reinstallation. Nissan charges $5,500+ for refurbished 24 kWh pack (when available), aftermarket remanufactured packs run $3,500-4,500 plus core. No passive cooling system means degradation is permanent.
Estimated cost: $4,500-8,500
Onboard Charger Failure
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Vehicle won't charge on Level 1 or Level 2, but DC fast charging still works, Red warning light on dash with 'EV System' message, No activity/clicking when plugged into 120V or 240V charger, Diagnostic code P318F or P318C (charger control circuit)
Fix: Onboard charger (OBC) located under hood requires 2-3 hours removal and replacement. Nissan part runs $1,200-1,800, remanufactured aftermarket units $600-900. Some failures traced to water intrusion through poorly-sealed connector.
Estimated cost: $1,000-2,200
12-Volt Auxiliary Battery Failure Causing No-Start
Common · medium severityTypical onset: 50,000-70,000 mi or 4-5 years
Symptoms: Vehicle completely dead, won't power on or unlock, Dashboard warning: 'Shift to P and restart', Clicking from relays but no Ready light, Traction battery full but car won't initialize
Fix: Standard 12V battery replacement, but Leaf drains it faster than gas cars due to always-on computers. 0.5-1 hour labor. Battery is located under hood in standard location. Use Group 35 or 51R battery, AGM preferred for longevity.
Estimated cost: $200-350
Inverter Coolant Pump Failure
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Reduced power warning light (turtle icon), Motor overheating on highway drives or in traffic, Whining or grinding noise from under hood near motor compartment, Diagnostic code P1A15 (inverter cooling system)
Fix: Electric coolant pump replacement requires 2-3 hours labor. Pump is part of motor/inverter cooling loop. Nissan OEM pump $400-600, aftermarket $250-400. Must bleed air from system after replacement to prevent motor overheating.
Estimated cost: $500-900
Occupant Classification Sensor (OCS) Recall Issues
Occasional · medium severitySymptoms: Passenger airbag light stays on or off incorrectly, Adult passenger triggers 'airbag off' light, Airbag warning light illuminated on dash
Fix: NHTSA recall 17V-244 addresses faulty seat sensor mat in passenger seat. Dealer replacement takes 1-2 hours, covered under recall. If out of recall window, passenger seat sensor mat replacement $300-600 parts plus 1.5 hours labor.
Estimated cost: $0 if recall applies, $450-800 otherwise
Charge Port Door Latch Failure
Occasional · low severityTypical onset: 60,000-100,000 mi
Symptoms: Charge port door won't open when button pushed, Door pops open while driving, Manual release cable required every time, Clicking sound but door doesn't release
Fix: Plastic latch mechanism breaks or actuator motor fails. Replacement takes 1-1.5 hours, requires removing inner fender liner. OEM door assembly $200-300, aftermarket $100-150. Can temporarily use manual release cable in trunk.
Estimated cost: $250-450
Reduction Gear (Gearbox) Oil Leak
Rare · medium severityTypical onset: 100,000+ mi
Symptoms: Gear oil puddle under front of vehicle, Whining noise from motor/transaxle area, Low fluid triggers 'EV system' warning, Oil visible on motor housing or belly pan
Fix: Output shaft seal or case gasket failure. Requires 3-5 hours labor to drop reduction gear assembly, replace seal/gasket, refill with NS-3 gear oil. Seal kit $50-100, fluid $30. Check for metal contamination in old fluid indicating gear wear.
Estimated cost: $400-800
Buy only if you need <60 miles daily range, can charge at home, and find one with documented SOH above 80%—otherwise battery replacement cost exceeds vehicle value.
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.