P0444

Universal

Evaporative Emission Control System Purge Control Valve Circuit Open

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The purge control valve helps route fuel vapors from the evaporative-emissions system into the engine to be burned. This code means the vehicle detected an open electrical circuit in the purge-valve control circuit. The valve may not operate as commanded, which can affect emissions or cause the check-engine light to turn on. The code identifies a circuit condition; it does not by itself prove the valve needs replacement.

Report an error with this code

⚠️ Before You Begin (Safety First)

This fault is usually not an immediate driving emergency. If you smell strong fuel vapors, see a fuel leak, or notice a fire risk, stop in a safe place, shut off the engine, avoid flames or sparks, and arrange professional help. Do not open fuel-system components for testing.

Common Symptoms

  • The check-engine light may be on because the control module detected an open purge-valve circuit.
  • There may be no noticeable change in how the vehicle drives.
  • If the valve cannot be electrically controlled, fuel-vapor purging may be reduced or unavailable, potentially affecting emissions.
  • Some vehicles may have driveability changes, such as rough running, depending on the circuit fault and system design.

Common Causes

  • A disconnected, loose, or damaged purge-valve electrical connector can interrupt the circuit.
  • A broken, chafed, corroded, or otherwise damaged wire may create an open circuit.
  • The purge valve's electrical coil may have an internal open circuit.
  • A fuse, power feed, ground, or control-side fault may interrupt the circuit, depending on the vehicle design.
  • A control-module or related circuit fault is possible but should be considered only after circuit checks.

Diagnostic Steps

  1. Record the code and any related codes before clearing anything; related information can help guide diagnosis.
  2. With the vehicle safely parked and the engine off, check the purge-valve connector for looseness, corrosion, moisture, or visible damage.
  3. Visually inspect accessible wiring near the valve for breaks, rubbing, or damaged insulation; avoid pulling on wires or probing terminals.
  4. Check the owner's manual for relevant fuse information and inspect only accessible fuses as directed; replace a fuse only with the specified type and rating.
  5. If the code returns or wiring damage is not obvious, have the circuit tested using vehicle-specific service information rather than replacing parts based on the code alone.

When to Call a Professional

Use model-specific wiring information to inspect the purge-valve circuit, connectors, wiring, power supply, and control path. A technician can compare scan-tool commands with circuit behavior and perform appropriate continuity or electrical checks. Confirm the fault is in the circuit before replacing the valve; applicability and procedures depend on the vehicle's model, year, and engine.

Compare component listings

Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.

Search Amazon Search eBay

Commonly Asked Questions

Does P0444 prove that the purge valve is bad?

No. It indicates an open electrical circuit in the purge-valve control circuit. The valve, connector, wiring, power supply, or control path may be involved.

Is an open circuit the same as a valve stuck open?

No. An open circuit describes an electrical interruption. A valve stuck open is a mechanical or flow condition and is not established by this code alone.

Can I keep driving with P0444?

The code alone is usually not an immediate reason to stop driving. Avoid driving and seek help if you detect a fuel leak, strong fuel vapors, or another unsafe condition.

Will replacing the purge valve necessarily clear the code?

Not necessarily. If the open circuit is in a connector, wiring, fuse, or control path, replacing the valve may not fix it. Diagnosis should identify where the circuit is interrupted.

Browse Available Code Guides

Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.