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2005 INFINITI FX45

4.5L V8AWDAUTOMATICgas
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Dead battery / stuck in Park? Emergency neutral procedure for this FX45
5-Year Cost of Ownership
$16,115 maintenance + known platform issues
~$3,223/yr · 270¢/mile equivalent · $7,287 maintenance + $8,128 expected platform issues
Common Problems & Known Issues

The 2005 FX45 pairs Nissan's VK45DE V8 with the RE5R05A five-speed automatic, a platform shared with the G35/M45. The transmission cooler and engine oil consumption are the two grenades waiting to go off—both can destroy the powertrain if ignored.

Transmission Oil Cooler Failure (Coolant-ATF Cross-Contamination)

Common · high severity
Typical onset: 80,000-130,000 mi
Symptoms: Pink or milky transmission fluid (strawberry milkshake), Transmission slipping, delayed engagement, or limp mode, White smoke from exhaust if ATF enters coolant system, Overheating transmission or engine
Fix: Replace external transmission cooler, flush both transmission (multiple times) and cooling system, replace radiator if internal cooler also failed. If caught late, transmission rebuild required. 8-12 hours labor for cooler/flush, add 18-25 hours if trans needs rebuild.
Estimated cost: $1,200-$1,800 (cooler/flush only), $4,500-$6,500 (with transmission rebuild)

VK45DE Engine Oil Consumption / Piston Ring Failure

Common · high severity
Typical onset: 90,000-150,000 mi
Symptoms: Burning 1+ quart every 500-1,000 miles, Blue smoke on cold start or acceleration, Fouled spark plugs (oil-soaked), Low oil pressure warning if run critically low
Fix: Piston rings fail due to carbon buildup and weak ring design. Proper fix requires engine removal, full teardown, hone cylinders, new rings/bearings/gaskets. 30-40 hours labor. Many owners trade or sell rather than repair.
Estimated cost: $6,000-$9,500

Transmission Mounts (Engine Mounts Also Common)

Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle, Visible sag or cracking in rubber mount sections, Driveline shudder under acceleration
Fix: Hydraulic mounts fatigue and collapse. Transmission mount is worst offender. Replace all three engine mounts and trans mount as a set for longevity. 3-5 hours labor depending on shop access.
Estimated cost: $800-$1,400

Fuel Pump and Fuel Level Sender Failure

Occasional · medium severity
Typical onset: 100,000-140,000 mi
Symptoms: Fuel gauge stuck at Full, Empty, or erratic readings, Hard starting or stalling when fuel level drops below 1/4 tank, Loss of power under load, Whining noise from rear of vehicle
Fix: Fuel pump assembly includes level sender—both fail. Tank must be dropped for access. 2.5-4 hours labor. Use OEM Nissan pump; aftermarket units fail prematurely on these.
Estimated cost: $700-$1,100

Front Lower Control Arm Bushings

Occasional · low severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front suspension, Steering wander or vague on-center feel, Uneven front tire wear (feathering on inside edges), Vibration through steering wheel at highway speeds
Fix: Rear bushings in lower control arms tear and allow excessive movement. Replace entire control arms (bushings not sold separately by Infiniti). 2-3 hours labor plus alignment.
Estimated cost: $600-$1,000

Transfer Case Oil Pump Chain (AWD Models)

Occasional · medium severity
Typical onset: 90,000-130,000 mi
Symptoms: Grinding or whining noise from center of vehicle, AWD warning light illuminated, Loss of AWD functionality (stuck in RWD mode), Metal shavings in transfer case fluid
Fix: Internal oil pump chain stretches and fails, starving transfer case bearings. Requires transfer case removal and teardown. 8-12 hours labor. Catch it early or risk full case replacement.
Estimated cost: $1,800-$2,800 (pump/chain), $3,500-$5,000 (full case)
Owner tips
  • Check transmission fluid color monthly after 80k miles—pink or milky means immediate cooler replacement before trans is damaged
  • Monitor oil consumption religiously; if burning more than 1qt per 2,000 miles, start planning engine work or exit strategy
  • Use Nissan Matic-S ATF only—aftermarket fluids cause valve body issues in the RE5R05A
  • Change transfer case fluid every 30k miles with GL-5 80W-90—cheap insurance against pump chain failure
Buy only if under 80k miles with documented trans cooler replacement and no oil consumption—otherwise you're inheriting two $6k+ repairs waiting to happen.
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.
476 jobs across 17 categories

body (30)

brakes (36)

cooling (21)

drivetrain (24)

electrical (75)

engine (67)

exhaust (22)

hvac (23)

interior (24)

maintenance (32)

steering (19)

suspension (42)

transmission (30)

🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.
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