What is Code P1456 DTC

This code P1456 does mean that you replace purge valve . Could be other thing's must test the Evaporative emission system . P1456 Honda Evaporative Emissions Control System Leakage Fuel Tank Suggest you take an have a qualified repair shop diagnose the problem .

What make an model ? P1456 Honda Evaporative Emissions Control System Leakage Fuel Tank P1456 Nissan Evaporative Emission Control System Leak Detected Small Leak

code p1456 refers to evaporative emission (EVAP) canister purge system(fuel tank system) -leak detected===causes--hose-fuel tank/pressure sensor--fuel filler cap--EVAP valve /bypass solenoid--EVAP two way valve---EVAP canister/vent valve

There is also a second reference to the code which is EVAP system leakage ====filler cap--EVAP canister purge valve--hoses---EVAP canister shut off valve---ECM programming---ECM

Check with the service dealer that the filler caps are interchangeable . It may be coincidence that the problem started after you changed caps or it may have shown a failure in the making

this refers to the Emission Control System leak detected ,fuel tank system so if you can get under vehicle safely have a look to see if there is a fuel leak but i would expect it would be more likely on the breather side of the system so a repair shop would be the best option

Hi James,
Kindly check this website for you for detailed description of code P1456.
P1456 Honda Evaporative Emissions Control System Leakage Fuel Tank

Apparently this code is a tricky one and hard to pinpoint it's problem and fix. I have seen it clear with just a new gas cap. Seen it clear by running nearly out of gas and filling up. I have seen it clear up with using higher octane gas for a couple of tanks. Many dealers cringe when cars come in with this code, because nothing appears wrong on their scanners, so they clear it and drive for a few miles and give it back to customers with a bill and a "we couldn't find anything wrong with it". Read the following Honda Forum post and make your own decision. Good luck. P1456 Evap Emission Control System leak Drive Accord Honda Forums

Your Code P1456 is a EVAP (Evaporative Emission Control System Leak Detected). Normally this is a leak in the System and will not cause a Miss. The Fuel goes to the Fuel Rail and the Excess is sent back to the Fuel Tank via the EVAP System. There is a Purge Valve on top of the tank that is probably causing the leak. The Miss is another issue (Spark Plugs, Ignition, Coil, or clogged fuel filter) would be where I would start.

Just replace the evap purge valve.

code P1456 set when there's small leak in the fuel tank system.
Most known reason for P1456:
-Didn't tight fuel cap on until it click for more that 3 time after fueling up and drove the car too long with cap loose.
-or a bad gas cap.
I'll try tighting the gas cap.
clear check engine.
if code come back, replace gas cap and clear check engine light again.