The fuel tank filler cap and the Purge Volume Control Valve are the more common problems that will trigger the P0456 code on Nissan vehicles.
There is a factory Nissan service bulletin to help diagnose the P0456 code:
Nissan Factory Service Bulletin OBDII Code P0456
There is a factory service bulletin for the 2007 Nissan Pathfinder:
2005-2007 Nissan Pathfinder Service Bulletin OBDII Code P0456
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
The cost to diagnose the P0456 2007 Nissan Pathfinder code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.
Malfunction is detected when Evaporative Emission (EVAP) control system has a very small leak, EVAP control system does not operate properly.
Need more information on how to fix the P0456 2007 Nissan Pathfinder code? Get Access to Factory Service Manuals
Get the P0456 2007 Nissan Pathfinder code diagnosed by a professional: Find a repair shop in your area