P0444: EVAP Purge Control Valve Circuit Open
TL;DR
P0444 = EVAP purge control valve circuit open. Severity: low. Top causes: open wiring/disconnected connector (40%), faulty purge valve (40%), corroded connector (15%), ECM driver (5%). Emissions-related; usually a quick fix.
Can I keep driving with P0444?
IF it’s just P0444 → safe to drive; it’s an emissions fault. Repair it to pass inspection and clear the light. You usually won’t notice any drivability change.
Symptoms
- Check engine light on
- Usually no drivability change
- May fail emissions/inspection
- No performance loss
- Rarely a faint fuel smell
Top causes (ranked by probability)
| Likely cause | Probability | Notes |
|---|---|---|
| Open/broken wiring or disconnected connector | 40% | |
| Faulty purge valve (open coil) | 40% | |
| Corroded connector | 15% | |
| ECM driver fault (rare) | 5% |
What does P0444 mean?
Technical explanation
P0444 is set when the ECM detects an open circuit in the purge solenoid control line. The purge valve meters fuel vapor from the charcoal canister into the intake. An open circuit means the ECM can’t energize the solenoid — typically from a broken/open wire, a disconnected or corroded connector, or a failed solenoid coil. Rarely the ECM driver is at fault. It’s an emissions monitor fault with little or no drivability impact.
In simple terms
A valve lets stored fuel vapors flow into the engine to be burned. P0444 means the electrical connection to that valve is broken (open) — usually a disconnected or broken wire, or a bad valve. The car normally drives fine; fix it to pass emissions and clear the light.
How to diagnose P0444 (step by step)
- Inspect the purge valve connector. Confirm it’s plugged in and not corroded.
- Test the solenoid resistance. An open coil (infinite resistance) confirms a bad valve.
- Check wiring continuity. Trace the control and power wires for an open/break.
- Verify the control signal. Confirm the ECM is trying to command the solenoid.
- Repair the open or replace the valve. Fix the wiring or replace the solenoid as found.
Repair options & cost
- Repair the open wiring/connector
- Replace the purge valve/solenoid
- Address the ECM driver fault (rare)
🔧 Doing it yourself? Buy the part: EVAP purge valve
| DIY cost | $20–$100 |
|---|---|
| Workshop cost | $80–$300 |
| Repair time | 20–45 minutes |
Costs are local ballpark ranges and vary by region and vehicle.
Tools you’ll need
Scan your car: recommended OBD-II scanners →Vehicle-specific notes
- Check that the purge valve connector is plugged in first — a disconnected connector is a common, quick cause.
- The purge valve is usually an easy, inexpensive DIY replacement.
- P0444 (open) is closely related to P0443 (general circuit) and P0445 (short).
Common mistakes to avoid
- Replacing the valve when a wire/connector is simply disconnected
- Overlooking a broken wire
- Ignoring a corroded connector
- Not confirming the ECM command signal
Frequently asked questions
What does P0444 mean?
The EVAP purge control valve circuit is open — usually a disconnected/broken wire or connector, or a failed purge solenoid with an open coil.
Is P0444 serious?
No, it’s low severity and emissions-related, with little drivability impact. Fix it to pass inspection and clear the light.
Can a disconnected connector cause P0444?
Yes — that’s a common, quick cause. Check that the purge valve connector is plugged in and not corroded before replacing anything.
P0444 summary
| Meaning | EVAP purge valve circuit open |
|---|---|
| Severity | Low |
| Safe to drive? | Yes — emissions related |
| Top cause | Open wiring / faulty valve (80%) |
| DIY cost | $20–$100 |
| Shop cost | $80–$300 |