P0444
Fix within 1-2 weeksThe engine computer detected an open circuit in the electrical system of the EVAP purge control valve.
Code P0444 means an open circuit in the EVAP purge control valve. Common causes: Faulty purge valve (75%), wiring issues (20%). Drivability: Yes, safe to drive. Repair cost: $30-$150 DIY, $150-$400 professional.
Can I Drive With P0444?
Yes, safe to drive
No restrictions, but fix within 1-2 weeks to avoid emissions test failure.
Stop driving immediately if: Flashing CEL, significant power loss, or strong fuel smell (which are not typical for P0444 but indicate a more severe issue).
Symptoms of P0444
- 1Check Engine Light is on
- 2No noticeable symptoms
- 3Slight decrease in fuel economy
- 4Rough idle (less common)
Common Causes of P0444
Parts most likely causing this code, ranked by probability
The purge valve itself has an internal electrical open circuit, preventing it from operating.
75% of P0444 cases are fixed by replacing this part
Damaged, corroded, or disconnected wiring or a faulty connector to the purge valve creates an open circuit.
20% of P0444 cases are fixed by repairing wiring or connectors
A rare internal fault within the engine computer can cause it to incorrectly report an open circuit.
5% of P0444 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the EVAP purge valve and its electrical connector for any obvious damage, corrosion, or loose connections.
- Ensure the gas cap is securely tightened (though less common for this specific code, it's a quick check for EVAP issues).
How to Diagnose P0444
- 1Visually inspect the EVAP purge valve and its electrical connector for damage, corrosion, or loose connections.
- 2Disconnect the purge valve and check the resistance across its terminals using a multimeter; compare to factory specifications.
- 3With the purge valve disconnected, check for proper voltage and ground at the connector using a multimeter.
- 4Check for continuity in the wiring harness between the purge valve connector and the engine computer (PCM) connector.
- 5If all other checks pass, consider professional diagnosis of the PCM.
P0444 on Popular Vehicles
Honda Civic
2006-2015The EVAP purge control valve is a common failure item on these models, leading to P0444. The valve is typically located on the intake manifold.
80% fixed by replacing the purge valve
Toyota Camry
2007-2017P0444 on Camry models often points to a faulty purge valve. Wiring issues are less common but should still be checked.
70% fixed by replacing the purge valve
Ford F-150
2004-2014Ford trucks can experience P0444 due to a failed purge valve or, in some cases, rodent damage to the wiring harness leading to the valve.
75% fixed by replacing the purge valve or repairing wiring
Frequently Asked Questions
What does P0444 mean?
P0444 indicates that your vehicle's engine computer has detected an open circuit in the electrical system of the EVAP (Evaporative Emission Control System) purge control valve. This means the valve is not receiving or sending the correct electrical signal.
Can I drive with P0444?
Yes, you can drive safely with a P0444 code. This code typically does not cause immediate drivability issues or damage to your engine. However, it will cause your vehicle to fail an emissions test and should be addressed within 1-2 weeks.
Will P0444 clear itself?
No, P0444 will not clear itself. The underlying electrical fault or component failure must be repaired. Once the repair is made, you will need to clear the code with an OBD-II scanner or drive through several complete drive cycles for the system to re-test and clear the code automatically.
How do I fix P0444 myself?
To fix P0444 yourself, start by visually inspecting the EVAP purge valve and its wiring connector for any obvious damage. If the wiring looks good, test the resistance of the purge valve with a multimeter. If it's out of specification, replace the EVAP purge control valve. If the valve tests good, check the wiring for continuity between the valve and the engine computer.
How much does it cost to fix P0444?
The cost to fix P0444 ranges from $30-$150 for DIY repairs, primarily for a new EVAP purge valve. Professional repair at a shop typically costs $150-$400, which includes the part and 1-2 hours of labor.
P0444 keeps coming back - why?
If P0444 keeps coming back, it indicates the original problem was not fully resolved. This happens if the purge valve was replaced but the actual issue was in the wiring harness, a corroded connector, or, in rare cases, a fault with the engine computer itself. A thorough electrical diagnosis is necessary.
Will P0444 fail emissions/smog test?
Yes, P0444 will cause your vehicle to fail an emissions or smog test. The EVAP system is a critical component of emissions control, and an open circuit in the purge valve means the system is not functioning correctly.
What's the difference between P0444 and P0441?
P0444 indicates an electrical open circuit in the EVAP purge control valve, meaning the computer cannot communicate with or activate the valve. P0441 indicates an 'Incorrect Purge Flow,' meaning the valve is operating but the amount of fuel vapor being purged is not what the computer expects, often due to a stuck valve or a blockage.
P0444 on Honda Civic?
P0444 is a common code on Honda Civics, particularly models from 2006-2015. The EVAP purge control valve is a frequent failure point on these vehicles. Replacing the purge valve often resolves the issue, but always inspect the wiring and connector first.
Questions to Ask Your Mechanic
Did you test the resistance of the EVAP purge valve itself?
Good answer: Yes, I measured the resistance across the valve terminals and it was outside the manufacturer's specified range, indicating an internal fault.
What did you find when checking the wiring continuity between the purge valve and the PCM?
Good answer: I found an open circuit in the wire leading from the PCM to the purge valve, likely due to a break or corrosion in the harness.
Repair Cost Estimate
DIY Repair
Parts only
$30-$150
Shop Repair
Parts + labor
$150-$400
Save $120-$250 by doing it yourself
Difficulty
intermediate
Time
0.5-1.5 hours
Intermediate - requires basic hand tools and a multimeter for electrical testing. Wiring repair skills may be needed if the harness is damaged.
Cost of Waiting
Ignoring P0444 will cause your vehicle to fail emissions inspections. While it typically doesn't cause immediate engine damage, a malfunctioning EVAP system can lead to slightly reduced fuel economy and, in some cases, a rough idle. A $50-$100 purge valve replacement now prevents ongoing emissions issues.
While You're In There...
If the purge valve is being replaced, inspect nearby EVAP hoses for cracks or brittleness, as they can also cause EVAP system issues and are easily accessible at the same time.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Basic Hand Tools (sockets, screwdrivers)
- Wire Strippers/Crimpers (if wiring repair is needed)
P0444 is a common emissions system code. Most repairs involve replacing an inexpensive part and your vehicle will pass emissions tests afterward.
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Your Next Steps
Step 1: Visually inspect the EVAP purge valve and its electrical connector. Look for frayed wires, corrosion, or a loose connection. Ensure the connector is fully seated.
Step 2: If the visual inspection doesn't reveal an issue, disconnect the purge valve and use a multimeter to test its internal resistance. Compare the reading to your vehicle's service manual specifications. If it's outside the range, replace the purge valve.
Step 3: If the purge valve tests good, use the multimeter to check for proper voltage and ground at the purge valve connector, and then check for continuity in the wiring harness back to the engine computer. This will identify any breaks in the circuit. Parts you'll likely need: a new EVAP purge control valve.