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On-board diagnostic (OBD) codes are designed to help mechanics and vehicle owners like you identify possible issues with your vehicle. But before attempting any fixes to resolve the codes retrieved by your scan tool, it’s important to know exactly what they mean.

Code P0444 is one of many trouble codes that may be logged and retrieved from the OBD system. Here is some basic information that may help you understand what getting this code may mean for your vehicle.

What Does the P0444 Code Mean?

Diagnostic trouble code (DTC) P0444 stands for “Evaporative Emission System Purge Control Valve Circuit Open.” This code is logged when the PCM detects a problem with the purge valve circuit.

On vehicles with an Evaporative Emission Control System (EVAP), fuel vapors from the gas tank are stored in a charcoal canister. Under precise operating conditions, the PCM opens the purge valve to draw the vapors from the canister into the engine’s intake manifold. The vapors are then burned as part of the normal combustion process.

Purge Valve in Isolated Gray Background
A faulty purge valve can cause the P0444 Code.

The PCM monitors the voltage to the purge control valve and detects any voltage changes within it. If it notices a problem with the purge valve’s circuit, it logs error code P0444.

Depending on the severity of the problem, related error codes may also be stored with this DTC. Code P0444 is very similar to error codes P0443 and P0445.

Read our discussion about the EVAP system, how it works, and its evolution to fully understand codes like P0444.

Note: The definition of code P0444 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P0444 Code?

P0444 is a generic code, so it can have several triggers. Here are the most common:

  • A faulty purge valve
  • Circuit problems, such as damaged wires or loose connections
  • PCM malfunction

What are the Common Symptoms of the P0444 Code?

You may notice the following symptoms if you drive a vehicle that has set a P0444 trouble code:

  • Illuminated check engine light
  • Reduced fuel economy
  • Noticeable fuel odor in some cases
  • Engine may idle rough, hesitate, or stall in some cases
  • Sometimes there are no adverse conditions exhibited besides the check engine light

How to Diagnose the P0444 Code

Error code P0444 is a generic code that may be set across several makes and models. However, this does not mean that there is a one-size-fits-all approach to diagnosing its underlying cause. The steps for troubleshooting this code will vary depending on your vehicle’s make and model.

Check out the video below to get an idea of what the diagnostic process for this code might involve:

How to Fix the P0444 Code

P0444 may share similar triggers and symptoms with other fault codes. However, that does not mean that they share repair steps as well. All vehicles are different, so make sure to refer to a factory repair guide that is specific to your car.

If you’re considering troubleshooting this code on your own, it’s a good idea to refresh your auto repair knowledge before attempting any fixes. Always consult the vehicle repair manual or an online repair database to learn the appropriate diagnostic and repair procedures for this code. Alternatively, you may leave this job to a professional.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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