P0444 EVAP failure

[blue62]

Originally Posted by Homeoboxter

Hey Folks,

I got a CEL shortly after refueling. The code is P0444, indicating it`s an EVAP system related issue (“Evaporative Emission System Purge Control Valve Circuit Open.”) I don`t have issues with filling up the tank, no stalling. I haven`t mess with anything recently in the engine compartment. I erased the code but the CEL came on within 20 mins.

I searched around the web and the forum regarding this code and found multiple causes including gas cap, purge valve, charcoal canister, vent lines, etc. Is there a recommended route to take on exploring the potential culprits?

Thanks!

I think the first thing to do is get a diagram of all related parts and hoses.
Then do some research to gain as much understanding as possible of how the system and related parts work.
Then with that... plan out a methodical step by step diagnostic procedure and prove each component of the system good or faulty. Starting with the simplest things first.
That is how I approach automotive issues.
The "EVAP" system is not complex but access to many of the components is the real issue.

From the code description you gave it sounds like the purge valve is stuck (open??) or there is an issue with the wiring to the purge valve.
I think the purge valve is in the wheel well behind the wheel well liner in the area of the fuel filler.... neck but I am not positive.