P0444 Code Meaning and Next Steps

First checks take 5 to 15 minutes for the first checks. No special tools are usually needed for the first checks.

Can you keep driving?

Stop driving if any of these apply

!There is a strong fuel smell or an obvious fuel leak.
!The vehicle develops drivability symptoms that suggest more than a simple EVAP monitor fault.

If the light is steady and the vehicle still drives normally: Usually yes, because this is often an emissions-system issue rather than an immediate drivability fault.

What to check first

Step-by-step checks

1
Free - no tools
Inspect the purge valve connector and harness for unplugged, broken, or corroded connections
2
Free - no tools
Check whether the valve has power and ground where it should
3
Basic tool needed
Look for recent service work that may have left the connector loose or the wiring stretched
4
Basic tool needed
If the valve is easy to test, verify whether the coil has continuity before buying a new part
5
Basic tool needed
If other EVAP codes are present, make sure the open circuit is not causing the rest of the symptoms too

If the code returns

-If continuity is missing, repair the wiring before condemning the rest of the system.
-If the connector is loose or corroded, that can be enough to create the open-circuit code.
-If the code returns after a valve swap, re-check the circuit under real operating conditions.

Background

What this code means

P0444 is a generic OBD-II EVAP system code.

An open circuit usually points to wiring, connector, or coil failure rather than a simple hose leak.

The purge system may stop working entirely, but the vehicle can still drive normally for a while.

Diagnosis

Common causes

Most common

Open purge valve circuit

A broken signal path is the classic explanation for this code.

Common

Failed purge valve coil

The valve may no longer show continuity across the coil.

Common

Connector or harness damage

A loose plug or broken wire can make the circuit look open.

Possible

Fuse or supply issue

If the power feed is missing, the valve will not operate correctly.

Avoid these mistakes

What not to do

xDo not assume a major repair before checking the cap and visible EVAP plumbing.
xDo not ignore a strong fuel smell or obvious leak while chasing an EVAP code.

Parts

Parts that may need replacing

PartTypical costNotes

EVAP purge valve$30-$90Most relevant if the coil or valve itself tests open.

Connector repair$15-$90Worth checking if the plug or pins are damaged.

Fuse or circuit repair$5-$40Relevant if power is missing on the feed side.

Related OBD codes

P0443

P0443 usually means the EVAP purge control circuit is not behaving correctly.

P0446

P0446 usually means the EVAP vent control system is not behaving correctly.

P0449

P0449 usually means the EVAP vent control circuit is not behaving correctly.

Source notes

Generic OBD-II (SAE J1979 / ISO 15031-5). P0444 was expanded around common open-circuit purge faults, including coil failure, wiring breaks, and connector damage.

This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.

This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.

Last reviewed: 2026-04-10

Reference: Open reference

P0444 - P0444 Usually Means the Evap Purge Valve Circuit Is Open