P0441: Evaporative Emission Control (EVAP) System → Incorrect Purge Flow


P0441 is one of the more common OBD-II trouble codes. It’s a generic powertrain code, which means regardless of what auto manufacturer built the vehicle, it’ll have the same meaning. It means that there is an issue with the  Evaporative Emissions System.

P0441: Evaporative Emission Control (EVAP) System → Incorrect Purge Flow

The vehicle’s ECM will trigger this code when it detects that the vacuum level in the Purge System is not within the proper specifications. If this code is thrown, it can cause the vehicle to fail an emissions check.


P0441 Symptoms

Often, the only symptom of P0441 will be the service engine soon light itself.  In a few cases there may be other symptoms.  Here they are:

  • Check Engine Light–  Often, this is the only indication of a problem.
  • Fuel Odor–  The EVAP system deals with fuel vapor.  Often when there is a problem with it there will be a gas odor, since the fuel vapor has somewhere to go other than the intake manifold.
  • Drivability Issues–  In only the rarest of occasions, the vehicle may stall or have an issue with the idle speed.


P0441 Causes

Here are some of the most common causes of the P0441 code.  They are presented (somewhat) in order from most to least likely to be at fault.

  • EVAP Canister Purge Valve– The most issue that cause the P0441 trouble code is going to be the vapor canister purge valve. When it goes bad, it typically causes issues with the vehicle’s idle speed. This is especially true right after you fuel up.  It’s really easy to replace. There are a few clips that you need to find and remove.  This is often the problem. They are really cheap on Amazon too. Always make sure to verify the fit for your vehicle. There’s a tool to check the fit right there.
  • Faulty Purge Control Solenoid–  There is a solenoid that controls the operation of the Purge Valve.  When it fails, the purge valve will no longer be able to operate properly.  When this happens P0441 will almost always throw.
  • Bad Vacuum Line–  If the vacuum line going to the purge canister has failed, that’ll cause the P0441 code to show up for sure.  This is worth taking a look at espescially if you live in a drier climate.  Vacuum leaks are pretty easy to detect as well.  Here’s a good article on how to find them from Popular Mechanics.
  • Gas Cap–  The gas cap going bad can cause P0441.  This is due to the fuel tank not having the right amount of pressure with a bad cap.  If you are getting a message to tighten your fuel cap when it is tightened already, you should replace the fuel cap before doing anything.  They are affordable, and easy to replace.
  • Wiring Issue to the Purge Solenoid–  Due to the location of the purge solenoid, it is not uncommon for the wiring going to it to fail.  Here’s a great article from Backyard Mechanic that explains how to detect a short circuit, if you think this may be the cause.  https://www.backyardmechanic.org/how-to-find-a-electrical-short-on-most-any-vehicle/.


It’s usually completely safe to drive your vehicle with P0441.  We still recommend dealing with it as soon as possible, though.  Good luck with fixing the issue.  If you feel there is anything that you would like to add to this article, please feel free to leave a comment below.  Good luck!