AutoCodes – Generic – P0444

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

Quick Answer

This system controls the flow rate of fuel vapor from the Evaporative Emission System (EVAP) canister. Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Control, Evaporative Emission Purge Solenoid Control harness is open or shorted, Evaporative Emission Purge Solenoid Control circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0444 indicates Evaporative Emission Control System Purge Control Valve Circuit Open.
Common causes: Common causes include Faulty Evaporative Emission (EVAP) Purge Solenoid Control, Evaporative Emission Purge Solenoid Control harness is open or shorted, Evaporative Emission Purge Solenoid Control circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 51,165

How popular is this code, among other codes? Medium

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0444 Description

This system controls the flow rate of fuel vapor from the Evaporative Emission System (EVAP) canister. The opening of the vapor bypass passage in the EVAP canister purge volume control solenoid valve changes to control the flow rate. The EVAP canister purge volume control solenoid valve repeats ON/OFF operation according to the signal sent from the Engine Control Module (ECM). The opening of the valve varies for optimum engine control. The optimum value stored in the ECM is determined by considering various engine conditions. When the engine is operating, the flow rate of fuel vapor from the EVAP canister is regulated as the airflow changes.
The EVAP canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. ON/OFF from the ECM pulses move the EVAP canister purge volume control solenoid valve. The longer the ON pulse, the greater the fuel vapor flow through the valve.
The Diagnostic Trouble Code (DTC) will be set when an excessively low voltage signal is sent to ECM through the valve.

OBDII Code P0444 - Evaporative Emission Control System Purge Control Valve Circuit Open - AutoCodes.com — P0444 Code - Evaporative Emission Control System Purge Control Valve Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0444?

Faulty Evaporative Emission (EVAP) Purge Solenoid Control
Evaporative Emission Purge Solenoid Control harness is open or shorted
Evaporative Emission Purge Solenoid Control circuit poor electrical connection

How to Fix the DTC P0444?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0444 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0444 code?

Need more information on how to fix the P0444 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0444 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0444 Audi — EVAP System Purge Control Valve Circuit Open
P0444 BMW — Evaporative Emission Control System Purge Control Valve Circuit Open
P0444 Hyundai — Evaporative Emission System-Purge Control Valve Circuit Open
P0444 Infiniti — EVAP Canister Purge Volume Control Solenoid Valve Circuit Open
P0444 KIA — EVAP Emission System Purge Control Valve Circuit Open
P0444 Mazda — EVAP Control System Purge Control Valve Circuit Open
P0444 Mercedes-Benz — Evaporative Emission Control System Purge Control Valve Circuit Open
P0444 MINI — Evaporative Emission Control System Purge Control Valve Circuit Open
P0444 Nissan — EVAP Canister Purge Volume Control Solenoid Valve Circuit Open
P0444 Subaru — Evaporative Emission Control System Purge Control Valve Circuit Open
P0444 Volkswagen — EVAP System Purge Control Valve Circuit Open

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0444 Code

1. What are the common symptoms of OBDII code P0444?

- Common symptoms of P0444 include the illumination of the check engine light, rough idling, decreased fuel efficiency, and difficulty starting the vehicle.

2. What does the OBDII code P0444 indicate?

- P0444 indicates a problem with the evaporative emission control system purge control valve circuit being open, which can lead to issues with properly controlling fuel vapors in the vehicle.

3. What are the possible causes of OBDII code P0444?

- Possible causes of P0444 include a faulty purge control valve, damaged wiring or connectors in the circuit, a malfunctioning PCM (powertrain control module), or a vacuum leak in the evaporative emission control system.

4. How can I diagnose the cause of OBDII code P0444?

- To diagnose P0444, you can use a scan tool to check for the code, inspect the purge control valve and surrounding wiring for damage, perform a smoke test to detect leaks, and test the PCM for proper functionality.

5. Can I drive my vehicle with OBDII code P0444?

- It is generally safe to drive your vehicle with P0444, but it is recommended to address the issue promptly to prevent potential damage to the emission control system and ensure optimal vehicle performance.

6. How can I repair OBDII code P0444?

- Repairing P0444 may involve replacing the faulty purge control valve, repairing or replacing damaged wiring or connectors, addressing any vacuum leaks, and resetting the PCM to clear the code.

7. Is it possible to reset OBDII code P0444 without repairs?

- While you can try clearing the code using a scan tool, it is important to address the underlying issue causing P0444 to prevent the code from reappearing and ensure your vehicle operates correctly.

8. Will OBDII code P0444 affect vehicle emissions testing?

- Yes, having P0444 stored in the vehicle's system may cause it to fail emissions testing, as it indicates a problem with the evaporative emission control system that regulates fuel vapors.

9. How much does it cost to repair OBDII code P0444?

- The cost of repairing P0444 can vary depending on the specific cause of the issue, but it may range from around $100 to $300 for parts and labor, with additional costs if the PCM needs to be replaced.

10. Can a DIY enthusiast fix OBDII code P0444?

- DIY enthusiasts with automotive repair experience and the necessary tools can potentially fix P0444 by following repair guides, but if unsure, it is recommended to consult a professional mechanic for assistance to ensure proper diagnosis and repair.