Evaporative Emission Control System Purge Control Valve Circuit Open
The P0444 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Purge Control Valve Circuit Open. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $50 - $250 (parts and labor)
A cracked or loose gas cap causes 60%+ of EVAP codes. This $8 replacement clears P0442, P0455, and P0457 more often than any other repair.
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If a new gas cap does not clear it, the leak is somewhere in the EVAP plumbing. A smoke machine finds the exact leak -- a cracked hose, bad seal, or stuck vent valve -- in minutes instead of guessing at parts.
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Clear the code after the repair. If the light stays off after 50 miles, you just saved $200+ in shop fees.
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Common Symptoms
- Check Engine Light illuminated
- Fuel vapor odor near the engine bay
- Slightly rough idle
- Failed emissions test
Probable Causes (Ranked by Likelihood)
- Open circuit in purge valve wiring harness Very High
- Failed purge control solenoid High
- Corroded or damaged connector at the purge valve Moderate
- Faulty ECM/PCM driver circuit Low
Step-by-Step Diagnostic Procedure
-
Inspect the purge valve connector for corrosion, bent pins, or damage
-
Use a multimeter to check for continuity in the purge valve wiring harness from ECM to the valve
-
Measure resistance across the purge valve solenoid terminals -- typical range is 20-40 ohms
-
Apply 12V directly to the purge valve to confirm it clicks and operates
-
Check ECM connector pins for the purge valve driver circuit
Common Fixes by Vehicle
What techs usually find when diagnosing P0444 on specific vehicles — tap your vehicle for the fix and the exact part:
2008-2018 Ford F-150/Escape 3.5L/2.5L easy DIY
P0444 indicates the EVAP purge control valve circuit is open. On Ford vehicles, the purge valve connector corrodes from moisture exposure. Inspect the 2-pin connector on the purge solenoid (mounted on the intake manifold). Clean with electrical contact cleaner or replace the connector pigtail. If the solenoid itself is faulty, replace with Motorcraft CX-2256.
Labor: 20-30 min2007-2019 Toyota Camry/RAV4 2.5L moderate DIY
Check the wiring harness between the ECM and the purge solenoid for chafed or broken wires. Toyota EVAP purge valves rarely fail mechanically -- the open circuit is usually a wiring issue. Inspect where the harness passes near the exhaust manifold for heat damage. If the valve itself tests open, replace with Dorman 911-612.
Labor: 30 min - 1 hour2010-2020 Chevrolet Equinox/Malibu 2.4L Ecotec easy DIY
The EVAP purge solenoid on GM Ecotec engines mounts to the intake manifold and is exposed to engine heat. The internal coil burns open over time. Test with a multimeter -- resistance should be 22-30 ohms. If open (OL reading), replace with ACDelco 214-2149. Also check for a blown fuse in the under-hood fuse box (EVAP fuse, typically 10A).
Labor: 15-20 minFrequently Asked Questions
Can I drive with code P0444?
Yes. This code indicates an electrical issue with the purge valve circuit and does not affect engine performance or safety. It will cause an emissions test failure.
How do I test the purge valve solenoid?
Disconnect the electrical connector and measure resistance across the solenoid terminals with a multimeter. A reading of 20-40 ohms is typical. An open reading (OL) confirms a failed solenoid.
Could rodent damage cause P0444?
Yes. Rodents frequently chew through underhood wiring, and the purge valve harness is a common target. Inspect the wiring for chew marks or exposed copper.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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