How is P0444 different from P0443?

P0443 is the general purge-valve circuit fault; P0444 says specifically the circuit is open — zero current when commanded. In practice the diagnosis is the same, with the multimeter pointed at the solenoid winding first.

Will the car run badly with this code?

Almost never — a valve that can't open just means vapors aren't purged. The engine runs normally; the light, the emissions test, and slow canister saturation are the real issues.

What happens if I ignore it for months?

The charcoal canister keeps absorbing vapor with no way to empty. Eventually it saturates, you may notice fuel smell, and on some vehicles a saturated canister leads to more expensive EVAP repairs. Fix the cheap part before it creates an expensive one.

OBD-II trouble code

P0444: Evaporative Emission System Purge Control Valve Circuit Open

The EVAP purge valve's control circuit is open — the computer commands the valve and sees no current flow at all.

Quick facts

System: Powertrain
Category: EVAP System
Severity: Low severity
Drivable: Usually safe to drive short-term
Repair cost range: $50 – $300
DIY difficulty: Intermediate DIY

What does P0444 mean?

P0444 refines the purge-valve electrical fault to a specific failure: an open circuit. When the engine computer drives the purge solenoid it monitors current, and here it sees none — the path is broken somewhere between the PCM driver, the harness, the connector, and the solenoid winding.

The short list: a purge solenoid whose winding has failed open (heat-cycled thousands of times per drive, this is common), a connector terminal that's corroded or has lost tension, or a broken wire — check where the harness bends near the engine or runs by hot components. If the circuit is fused on your vehicle, the fuse is the 30-second first check.

Because the valve simply never opens, drivability is normally unaffected; the canister just never purges. The consequences are the check engine light, a failed emissions test, and eventually a saturated charcoal canister — worth fixing before it takes the canister with it.

Common causes

Open solenoid winding in the purge valve
Corroded, backed-out, or loose connector terminal
Broken control or feed wire in the harness
Blown fuse (where the circuit is fused)
PCM driver failure (rare)

Symptoms

Check engine light on
No noticeable drivability change in most cases
Failed emissions inspection
Possible fuel smell over time as the canister saturates

Diagnostic steps

1.Check the relevant fuse first if the circuit has one.
2.Measure purge solenoid resistance at the valve connector — infinite reading means the valve's winding is open; replace it.
3.If the solenoid reads normal (typically 20-40 ohms), back-probe for power and ground while commanding the valve with a scan tool.
4.Inspect connector terminals for corrosion and grip; repair terminals properly.
5.Trace the harness for breaks at flex points.
6.After repair, command the valve, confirm the click and vacuum flow, and verify the code stays clear.

Repair cost

$50 – $300

Usually a $20-$100 purge valve and under half an hour of labor. Terminal or wiring repairs are similarly cheap. This is firmly in the affordable tier of emissions repairs.

Estimate your repair

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Open the Repair Cost Estimator with evap system repair preselected. Adjust labor rate and vehicle category to fit your situation.

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DIY vs shop

This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.

Related codes

P0443 P0445 P0441 P0440