TorqueMech OBD Code Guide
P0444 - Evaporative Emission Control System Purge Control Valve Circuit Open
The EVAP purge valve circuit is open.
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Common Next Steps
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Smoke test EVAP system
Use smoke testing when the leak source is not obvious.
Verify purge sealing
Check purge command and sealing before replacing the valve.
Check vent operation
Command the vent valve and inspect canister-side blockage or contamination.
Related Inspection
Code Overview
The EVAP purge valve circuit is open.
Common Causes
- Loose fuel cap or EVAP leak
- Failed purge or vent valve
- Pressure sensor or wiring issue
Diagnostic Steps
- Inspect the fuel cap and EVAP hoses first
- Check purge and vent valve operation
- Use smoke testing if the leak is not obvious
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Next Steps
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