P0444 Code - Evaporative Emission Control System Purge Control Valve Circuit Open

What Does P0444 Mean?

The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap). Under precise operating conditions—dictated by engine temperature, speed, and load—the EVAP system stores and purges these captured fuel vapors back into the combustion process.
Code P0444 indicates that there is improper purge flow in the EVAP system caused by an open purge valve circuit.

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What are the common causes of P0444 ?

Typical causes of code P0444 could include any or all of the following-

• Damaged, burnt, shorted, or corroded wiring and/or connectors.
• Open circuits.
• Purge valve stuck in the open position.
• Failed, or failing PCM. Note however that this is rare event, and the fault must be sought elsewhere before any controller is replaced.

NOTE: Although code P0444 is rarely caused by issues other than wiring problems and defects in the valve itself, there is one notable exception to this. On early 2000’s Dodge Ram trucks, this code can be set by a short circuit in the seat belt warning chime circuit, since this circuit shares a fuse with both the CD changer and the EVAP system. This is a common problem, so consult the relevant manual on the correct procedure to prevent a continual recurrence of the problem.

How do you troubleshoot P0444 ?

• The EVAP system should be inspected thoroughly before following through with any repairs.
• Any broken or faulty wiring should be replaced or repaired as needed.
• Faulty components in the EVAP system should be replaced upon being diagnosed as such.
• Retest the system following each repair to limit unnecessary troubleshooting.
• The vehicle should be given a thorough test drive after repairing to help ensure the problem has been solved.

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