2003–2013 INFINITI FX35

Typical onset: 70,000-130,000 mi

Symptoms: Transmission slipping or shuddering, Milky or strawberry-colored transmission fluid, Check engine light with trans codes, Coolant loss with no visible leak, Total transmission failure if driven after mixing

Fix: The internal transmission cooler in the radiator fails, allowing coolant and ATF to mix—this destroys the transmission in hours if not caught early. Requires radiator replacement, trans flush or full rebuild, and all cooler lines flushed. If caught before damage: 4-6 hours. If trans is contaminated: add 12-18 hours for rebuild. PREVENTIVE: replace radiator proactively at 80k-100k miles.

Estimated cost: $800-1,200 (radiator only), $3,500-5,500 (with trans rebuild)

Typical onset: 120,000-180,000 mi

Symptoms: Burning 1+ quart per 1,000 miles, Blue smoke on startup or acceleration, Fouled spark plugs, Loss of power, Eventually: rod knock or catastrophic failure

Fix: The VQ35DE is prone to piston ring land cracking and excessive wear, especially if oil changes were neglected. Once consumption starts, it accelerates. Requires engine rebuild (pistons, rings, hone cylinders, bearings) or short-block replacement. Labor: 18-24 hours for in-chassis rebuild, 20-26 hours for R&R and short block swap.

Estimated cost: $4,500-7,000 (rebuild), $5,500-8,500 (short block replacement)

Typical onset: 80,000-140,000 mi

Symptoms: Clunking when shifting from Park to Drive/Reverse, Vibration at idle in gear, Excessive driveline movement felt through chassis

Fix: The rear transmission mount (crossmember mount) fails due to fluid leakage from the hydraulic damper. Infiniti/Nissan revised the part multiple times. Replace with updated OEM or upgraded aftermarket polyurethane. Labor: 2-3 hours (requires exhaust and crossmember drop).

Estimated cost: $400-700

Typical onset: 100,000-160,000 mi

Symptoms: Harsh or delayed shifts, Flaring between gears, Limp mode (stuck in 3rd or 5th gear), P0868 or P1706 codes

Fix: The RE5R05A transmission's valve body solenoids and pressure control circuits wear out or get contaminated. If fluid services were neglected, debris accelerates failure. Requires valve body removal, solenoid replacement, and fluid flush. Labor: 6-9 hours (trans drop, valve body R&R, calibration).

Estimated cost: $1,200-2,200

Typical onset: 150,000-200,000+ mi

Symptoms: Rattling noise on cold start (first 5-10 seconds), Noise from front of engine at idle, Check engine light with cam/crank correlation codes

Fix: While not as catastrophic as the VQ40, the VQ35DE's timing chain guides and tensioners do wear. If ignored, chain can jump or break, causing valve-to-piston contact. Requires timing cover removal, chains, guides, tensioners, and often water pump while in there. Labor: 10-14 hours.

Estimated cost: $2,000-3,500

Typical onset: 60,000-100,000 mi

Symptoms: Clunking over bumps, Wandering or vague steering feel, Uneven tire wear (inside edge), Alignment won't hold

Fix: The front lower control arm bushings deteriorate, especially in harsh climates. Some shops replace bushings only (press-in), but most replace complete arms due to labor overlap. Labor: 3-4 hours for both sides with alignment.

Estimated cost: $600-1,000

Typical onset: 100,000-150,000 mi

Symptoms: No-start or hard starting, Stalling when fuel level is low (below 1/4 tank), Fuel gauge erratic or stuck, Whining noise from rear

Fix: Fuel pump assembly or level sender fails. Requires fuel tank drop or (on some years) removal via access panel under rear seat. Labor: 2-4 hours depending on access method and rust.

Estimated cost: $500-900