A lot of times, an evap code can be set by running the vehicle with the gas cap off. Also, if the gas cap is faulty, it can set the code as well. You may want to check the cap first (at least it's fairly inexpensive) and make sure it's sealing correctly. You can have the code reset at Auto Zone or Advance Auto Parts. If the code comes back, you may want to consider changing the cap, but make sure you replace it with the correct one. Not all gas caps will do the trick, resulting in the code just coming back. I would recommend purchasing it from the dealer.
I hope this helps to get you started! :)
Did you check the evap purge solenoid, if it is working and the inline hose have pressure while the engine is running, the problem is on the fuel tank pressure, the FTP sensor or clog hose goint to evap solenoid, femove fuel tank cap to release the tank pressure and observe the freeze frame failure on the diagnostic chart, P0455 is a big leak detected,
Evaporative Emission Control System Incorrect Purge Flow
What does that mean?
This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is controlled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Symptoms
Likely, no symptoms will be discernible to the driver, other than the illuminated Check Engine Light.
Causes
A code P0441 could mean one or more of the following has happened:
With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Other EVAP DTCs: P0440 - P0441 - P0442 - P0443 - P0446 - P0453 - P0455 - P0456
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