The 2004 Quest with the VQ35DE is a spacious minivan plagued by catastrophic transmission failures and a well-documented engine consumption defect that destroys motors. These aren't 'if' problems—they're 'when' problems that make this generation a financial trap.
Transmission Failure (RE5R05A 5-Speed Automatic)
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: Shuddering or hesitation during 2-3 or 3-4 shifts, Slipping under acceleration, especially when warm, Whining or grinding noises from transmission, Complete loss of forward gears, stuck in limp mode
Fix: The RE5R05A is known for valve body failures, torque converter shudder, and complete internal destruction. Rebuilds rarely last—most shops recommend replacement with remanufactured unit. 8-12 labor hours for R&R, plus fluid and cooler flush. The cooler itself often fails first, sending debris through the system.
Estimated cost: $3,200-5,500
Catastrophic Engine Oil Consumption / Pre-Ignition Failure
Common · high severityTypical onset: 90,000-150,000 mi
Symptoms: Burning 1+ quart of oil every 1,000 miles with no external leaks, White or blue smoke from exhaust on startup or acceleration, Engine knock or rattling, especially cold starts, Check engine light with misfire codes (P0300-P0306), Sudden catastrophic failure—spun bearings, scored cylinders
Fix: The VQ35DE in this generation suffers from defective piston ring design and cylinder bore glazing that causes runaway oil consumption. Eventually leads to oil starvation, pre-ignition, and complete engine destruction. Requires full engine rebuild (pistons, rings, bore honing, bearings) or short block replacement. 18-24 labor hours. Many owners discover this only after total engine seizure.
Estimated cost: $4,500-7,000
Transmission Oil Cooler Rupture (Coolant Contamination)
Common · high severityTypical onset: 70,000-120,000 mi
Symptoms: Milky or pink transmission fluid (coolant mixing), Transmission overheating, erratic shifting, Coolant loss with no visible external leaks, Transmission failure shortly after coolant contamination
Fix: The internal transmission cooler inside the radiator fails, allowing coolant and ATF to mix—this destroys the transmission within days if not caught immediately. Requires radiator replacement, complete transmission fluid system flush (including torque converter and all lines), new cooler lines, and often transmission rebuild if contamination occurred. 6-10 hours if caught early, more if transmission damaged. Install external cooler as preventive measure.
Estimated cost: $1,200-4,500
Power Sliding Door Failures
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Door opens or closes partially then stops, Grinding, clicking, or whining noises during operation, Door won't latch, stays partially open, Complete failure to respond to switches or key fob
Fix: Cable guides break, motors wear out, and rollers seize in the track. The latch mechanisms also fail frequently (recall issued but doesn't cover all failure modes). Motor replacement is 2-3 hours per door, cable/roller repair adds 1-2 hours. Often both doors fail within similar timeframes.
Estimated cost: $600-1,400
Intake Manifold Gasket / Plenum Gasket Leaks
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Rough idle, especially when cold, Hesitation or stumbling on acceleration, Check engine light with lean codes (P0171, P0174), Hissing sound from engine bay
Fix: Upper and lower intake gaskets deteriorate, causing vacuum leaks. Requires manifold removal and gasket replacement—straightforward but labor-intensive on the VQ35DE due to tight engine bay. 4-6 labor hours. Use OEM or high-quality aftermarket gaskets; cheap ones fail quickly.
Estimated cost: $600-1,000
Front Engine Mount / Transmission Mount Failure
Common · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunking on acceleration or deceleration, Excessive engine movement visible when shifting into gear, Vibration at idle in Drive, Steering wheel shakes during hard acceleration
Fix: Hydraulic mounts deteriorate and collapse. Front engine mount is the typical culprit, followed by transmission mount. Each mount is 1.5-2 hours labor. Replace front and transmission mounts together to avoid comeback. OEM mounts last longer than aftermarket.
Estimated cost: $400-700
Hard pass unless free—the transmission and engine are both ticking time bombs that will cost more to fix than the van is worth.
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.