The 2020 Armada uses Nissan's tried-and-true VK56VD V8 and a 7-speed automatic, both generally solid, but this generation suffers from transmission cooler failures that can grenade the trans, plus the V8 has known piston/ring issues leading to oil consumption and eventually catastrophic engine failure if ignored.
Transmission Oil Cooler Failure Leading to Trans Contamination
Common · high severityTypical onset: 60,000-100,000 mi
Symptoms: transmission fluid looks milky or strawberry-colored, harsh or delayed shifts, check engine light with trans temp codes, coolant mixing into transmission via internal cooler rupture
Fix: Replace transmission oil cooler (integrated into radiator), flush transmission multiple times, replace filter and fluid. If caught late, transmission rebuild or replacement required. 4-6 hours labor for cooler/flush alone, 18-25 hours if trans is damaged.
Estimated cost: $1,200-2,500 for cooler/flush; $4,500-7,000 if trans needs rebuild
VK56VD Piston Ring and Cylinder Wear - Oil Consumption
Occasional · high severityTypical onset: 80,000-140,000 mi
Symptoms: burning 1+ quart of oil every 1,000-2,000 miles, blue smoke on startup or acceleration, loss of power under load, fouled spark plugs, eventual rod knock if run low on oil
Fix: Requires engine rebuild or short block replacement: pistons, rings, hone cylinders, bearings. Some techs pull the engine for access. 25-35 hours labor plus parts.
Estimated cost: $6,000-10,000
Transmission Mount Deterioration
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: clunking when shifting from park to drive or reverse, vibration at idle in gear, excessive engine movement visible under hood during acceleration
Fix: Replace transmission mount(s). Often the rear trans mount goes first. 1.5-2.5 hours labor.
Estimated cost: $300-600
Fuel Pump Control Module Failure (NHTSA Recall)
Occasional · high severitySymptoms: no-start or stalling while driving, engine cuts out without warning, fuel pump not priming on key-on
Fix: Covered under NHTSA recall for fuel pump control module. Dealer replaces module at no cost. If out of recall window or not covered, module replacement is 1-2 hours labor.
Estimated cost: $0 if recall applies; $400-700 otherwise
Head Gasket Seepage (Both Banks)
Rare · medium severityTypical onset: 100,000-150,000 mi
Symptoms: coolant weeping from head/block seam, slight coolant smell, no overheating initially but slow coolant loss, white residue around head bolt area
Fix: Replace head gaskets on both banks, resurface heads if warped, new head bolts. Engine does not need to come out but expect 16-22 hours labor.
Estimated cost: $3,500-5,500
Crankshaft Position Sensor Intermittent Failure
Occasional · medium severityTypical onset: 60,000-120,000 mi
Symptoms: random no-start, cranks but won't fire, intermittent stalling, check engine light with crank sensor code P0335 or P0340
Fix: Replace crankshaft position sensor. Access is tight on passenger side of block. 1-1.5 hours labor.
Estimated cost: $250-450
Solid truck if the trans cooler has been addressed and oil consumption is minimal; otherwise budget $5k-10k for major repairs in the next 50k miles—buy with a pre-purchase inspection or walk away.
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.