What's the 2003 Honda Pilot code p1456?

The p1456 code listed for the 2003 Honda Pilot will indicate an EVAP system leak has been detected. This is one of the most common fault codes and it typically can be the result of a loose or damaged fuel cap. This will be the first thing to inspect to see if this could be the cause. There can also be other issues with the vehicle such as a bad vapor canister purge valve, fuel vapor hose leak, or a d***y or damaged fuel tank pressure sensor. You will most likely have to inspect these items to find the cause which can be tiresome or You can take it to the dealership or auto shop mechanic and have them diagnose it for You.