2022 INFINITI QX80

Typical onset: 80,000-150,000 mi

Symptoms: Rattling or whining noise on cold start that fades after warmup, Check engine light with cam/crank correlation codes (P0011, P0021), Sudden loss of power or no-start after rattling progresses, Metal shavings in oil, oil pressure warning

Fix: VK56 uses plastic-backed timing chain guides that disintegrate, letting chains slap and jump timing. Proper fix requires front engine teardown, all three chains, tensioners, and guides—8-12 hours labor. If caught late, you're looking at pistons, valves, head work, or full short block. Many 2022s still under powertrain warranty, but post-warranty this is the killer.

Estimated cost: $3,500-6,000 for chains/guides alone; $8,000-15,000 if valves/pistons damaged

Typical onset: 60,000-110,000 mi

Symptoms: Transmission fluid in coolant (strawberry milkshake in overflow tank), Coolant in transmission (delayed engagement, slipping, burnt ATF smell), Overheating transmission temp warnings, Harsh shifting or limp mode after fluid cross-contamination

Fix: The RE7R01A transmission cooler is integrated into the radiator end tank. Internal failure allows ATF and coolant to mix, destroying the transmission if driven. Requires radiator replacement, complete transmission flush or rebuild depending on contamination severity, all cooler lines flushed—6-10 hours for radiator/flush, add 18-24 hours if transmission needs rebuild.

Estimated cost: $1,800-3,200 for radiator and flush; $5,500-8,500 if transmission rebuild required

Typical onset: 50,000-90,000 mi

Symptoms: Clunk or thud when shifting from Park to Drive or Reverse, Vibration through floorboard at highway speeds, Excessive driveline movement visible under throttle changes

Fix: Heavy vehicle plus torquey V8 kills the rear transmission mount. Rubber separates from metal housing. Replacement requires supporting transmission, unbolting crossmember—2-3 hours labor. OEM mount mandatory; aftermarket versions fail faster.

Estimated cost: $450-750

Typical onset: 70,000-120,000 mi

Symptoms: Intermittent no-start or extended cranking, especially when hot, Loss of power under load or highway speeds, Fuel pump whine audible from rear seats, P0087 fuel rail pressure too low code

Fix: Integrated fuel pump module in tank includes filter screen that clogs or pump motor fails. Tank must be dropped—4-5 hours labor. Many techs replace entire module rather than piecing pump internals. Use top-tier fuel to extend life.

Estimated cost: $1,200-1,900

Typical onset: 70,000-130,000 mi

Symptoms: Coolant smell in cabin with no visible external leaks, Slow coolant loss, needing top-offs every few weeks, Steam or coolant dripping onto exhaust after shutdown, Overheating in severe cases

Fix: Aluminum coolant crossover tube behind intake manifold corrodes at welds or O-ring seals fail. Requires upper intake manifold removal to access—6-8 hours labor. Replace all coolant hoses in area while you're in there.

Estimated cost: $1,400-2,200

Typical onset: 60,000-100,000 mi

Symptoms: Check engine light with P0410, P0418 codes (secondary air system), Rough idle for first 30-60 seconds on cold start, Pump noise or rattling during cold start cycle

Fix: Emissions-related secondary air pump seizes or control valves stick. Doesn't affect driveability but won't pass inspection in emissions states. Pump replacement 2-3 hours, valves add another hour each. Can delete system in non-emissions states but CEL remains.

Estimated cost: $800-1,400