The 2006 Quest uses Nissan's solid VQ35DE V6, but is plagued by the notorious RE5R05A 5-speed automatic transmission that suffers catastrophic internal failures and a design-flawed external cooler. Engine internals fail prematurely due to pre-ignition issues from improper fuel or carbon buildup.
Transmission Cooler Line Failure and Radiator Cross-Contamination
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Strawberry milkshake-colored fluid in radiator or transmission, Transmission slipping or delayed engagement after radiator work, Overheating transmission temp gauge readings, White smoke from exhaust if coolant enters trans
Fix: The cooler inside the radiator fails, allowing coolant and ATF to mix. Requires new radiator, complete transmission flush or replacement if contaminated, all cooler lines, and external aux cooler install. 6-10 hours labor if trans is salvageable, 12-18 if it needs replacement.
Estimated cost: $1,800-5,500
RE5R05A Transmission Internal Failure
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Harsh 2-3 or 3-4 shifts with flare or bang, Slipping in 5th gear on highway, Check engine light with P0732, P0733, P0734 codes (gear ratio errors), Delayed reverse engagement or complete loss of reverse
Fix: Worn clutch packs, failed solenoids, or valve body issues. Overhaul requires 10-14 hours; most shops recommend remanufactured unit due to age. Fluid changes every 30k miles help but don't prevent eventual failure on this generation.
Estimated cost: $3,200-5,000
VQ35DE Piston Ring and Cylinder Wall Damage from Pre-Ignition
Occasional · high severityTypical onset: 100,000-180,000 mi
Symptoms: Excessive oil consumption (quart every 500-1000 miles), Blue smoke on startup or acceleration, Rattling knock under load, especially uphill, Loss of compression in one or more cylinders
Fix: Carbon buildup and pre-ignition destroy ring seal and score cylinder walls. Requires engine rebuild with bore/hone, new pistons, rings, bearings, and head work. 18-24 hours labor. Some engines need complete short block replacement if damage is severe.
Estimated cost: $4,500-7,500
Rear Transmission Mount Failure
Common · medium severityTypical onset: 70,000-130,000 mi
Symptoms: Clunk when shifting from park to drive or reverse, Excessive vibration at idle in gear, Visible sagging or torn rubber on mount inspection, Shifter feels loose or sloppy
Fix: The rear trans mount collapses from the weight of the RE5R05A. Requires subframe support and mount replacement. 2-3 hours labor. Inspect all engine mounts at same time as they age similarly.
Estimated cost: $350-600
Fuel Filter Clogging and Pump Strain
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Hesitation or stumble during acceleration, Loss of power uphill or under load, Hard starting after sitting overnight, Check engine light with lean codes P0171/P0174
Fix: In-tank filter not serviceable separately; requires fuel pump assembly replacement if clogged. Tank drop needed. 3-4 hours labor. Often caused by never changing external inline filter (if equipped) or contaminated fuel.
Estimated cost: $600-950
Head Gasket Failure from Overheating Events
Occasional · high severitySymptoms: White smoke from exhaust continuously, Coolant loss with no visible leaks, Oil looks milky brown on dipstick, Overheating despite new thermostat and water pump
Fix: Usually secondary to transmission cooler failure or other overheat incident. Both heads should be done simultaneously, includes machining/checking for warpage. 12-16 hours labor. Timing chains should be inspected/replaced during this job.
Estimated cost: $3,000-4,800
Pass unless you can verify the trans cooler fix was done and transmission has recent fluid service — these are $3k+ repair grenades waiting to go off, and engine rebuilds are common enough to make high-mileage examples risky.
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.