When your 2020 Nissan Pathfinder displays the P0305 code, the engine control module has detected repeated misfires in cylinder 5. The 2020 Pathfinder uses the 3.5L V6 engine exclusively, which has six cylinders numbered 1-6, making P0305 a legitimate diagnostic code indicating an actual cylinder 5 misfire.
2020 Pathfinder Powertrain
The fourth-generation 2020 Pathfinder uses the 3.5L VQ35DD direct-injection V6 producing 284 horsepower. This proven Nissan V6 is paired with a CVT transmission. All 2020 Pathfinders have this same engine configuration.
Cylinder 5 Location
On Nissan's VQ35 V6 engine, cylinder 5 is located on the rear bank (toward the firewall) in the center position. The transverse engine mounting places this cylinder in a somewhat difficult-to-access location, requiring removal of intake components in some cases.
Common Causes
Spark plug wear is common, especially approaching 100,000 miles. Ignition coil failure can occur at cylinder 5. Direct injection engines accumulate carbon on intake valves over time. Fuel injector issues can cause lean misfires. Vacuum leaks around the intake manifold affect individual cylinder air-fuel ratios.
Diagnostic Process
Read all diagnostic codes and freeze frame data. Access cylinder 5's spark plug on the rear bank and inspect for wear, fouling, or damage. Test the ignition coil through resistance measurement and swap testing. Check for vacuum leaks. Verify fuel injector operation.