The 2022 Infiniti QX80 full-size luxury SUV features the 5.6-liter V8 engine (VK56VD) producing 400 horsepower as its sole powertrain option. This powerful V8 includes cylinder 5 as a legitimate position. A P0305 diagnostic trouble code indicates the engine management system has detected a misfire at this cylinder.
Understanding P0305 on QX80
The P0305 code signifies "Cylinder 5 Misfire Detected." On Nissan/Infiniti's 5.6L V8, cylinder 5 is positioned on one bank of the V configuration. Misfires at this position affect the smooth, powerful operation expected from Infiniti's flagship SUV.
VK56VD V8 Features
The 5.6L V8 uses Variable Valve Event and Lift (VVEL) technology along with direct injection. This sophisticated engine delivers strong performance but requires premium maintenance to prevent misfire conditions.
Common Misfire Causes
Cylinder 5 misfires on the QX80 typically result from ignition coil degradation, spark plug wear, fuel injector issues, carbon deposits from direct injection, or in rare cases, VVEL system issues.
Flagship Standards
The QX80 represents Infiniti's flagship model. Any misfire disrupts the ultra-smooth, powerful driving experience expected from this premium full-size SUV.