2024 INFINITI QX55

Typical onset: 30,000-70,000 mi

Symptoms: sudden loss of power, metallic knocking or rattling from engine, check engine light with low oil pressure codes, oil consumption between changes, rough idle with misfires

Fix: The VC-Turbo's actuator arms, multi-link system, and bearing surfaces fail prematurely. Once internals are damaged, it's engine replacement or rebuild. Rebuild requires 25-35 hours labor plus extensive parts (pistons, bearings, rings, head gaskets). Most shops recommend remanufactured long-block swap at 18-22 hours.

Estimated cost: $8,500-15,000

Typical onset: 40,000-80,000 mi

Symptoms: transmission slipping or shuddering, delayed engagement when shifting to drive, transmission overheating warning, coolant mixing with transmission fluid (strawberry milkshake appearance), loss of forward gears

Fix: The external oil cooler develops leaks or internal coolant-to-fluid contamination. Requires cooler replacement, often full transmission fluid flush, sometimes new CVT if contamination circulated. Oil cooler alone is 3-4 hours, but if fluid contaminated the CVT, add 8-12 hours for replacement.

Estimated cost: $800-1,200 (cooler only), $5,500-7,500 (if CVT damaged)

Typical onset: 50,000-90,000 mi

Symptoms: clunking when shifting from park to drive, excessive vibration at idle, lurching during acceleration, visible drooping or tearing of rubber mount

Fix: The front transmission mount deteriorates from the CVT's vibration characteristics and weight. Requires lifting powertrain slightly to replace. 2.5-3.5 hours labor.

Estimated cost: $450-750

Typical onset: 35,000-65,000 mi

Symptoms: hard starting or extended cranking, intermittent stalling, loss of power under load, fuel pressure codes P0087 or P0088, rough running at cold start

Fix: The direct-injection fuel pump fails internally, often sending metal debris through the fuel system requiring injector replacement and full system cleaning. HPFP replacement alone is 4-5 hours, but contamination cleanup adds 8-10 hours plus injector costs.

Estimated cost: $1,200-1,800 (pump only), $4,500-6,500 (with contamination)

Typical onset: 25,000-55,000 mi

Symptoms: intermittent no-start condition, stalling while driving, rough idle, P0335 or P0340 codes, engine dying at stop lights

Fix: Sensor fails due to heat exposure from turbocharger proximity. Located deep in engine bay requiring significant disassembly. 3-4 hours labor.

Estimated cost: $500-800

Typical onset: 40,000-70,000 mi

Symptoms: reduced power output, boost pressure codes P0299, whistling or fluttering sounds under acceleration, check engine light, limp mode activation

Fix: Electronic wastegate actuator binds or fails in the variable-geometry turbo. Often requires complete turbocharger replacement as actuator isn't serviced separately. 6-8 hours labor.

Estimated cost: $2,200-3,500