EVAP Purge Control Valve Circuit Open
The P0444 code indicates that the Powertrain Control Module (PCM) has detected an open circuit in the evaporative emission (EVAP) purge control valve circuit. This valve regulates the flow of fuel vapors from the charcoal canister to the intake manifold. An open circuit means there is a break in the electrical path, preventing the valve from operating correctly. This can be caused by a faulty purge valve, damaged wiring, or a poor electrical connection.
01. Most Common Causes
- Faulty EVAP purge control valve
- Open or shorted wiring in the purge valve circuit
- Corroded or loose electrical connector at the purge valve
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible rough idle or hesitation
- Fuel odor from the engine bay
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0444 and check for other codes.
Step 2: Visually inspect the purge valve connector and wiring for damage or corrosion.
Step 3: Test the purge valve resistance with a multimeter (typically 20-30 ohms).
Step 4: Check for battery voltage at the purge valve connector with the engine running.
Step 5: If voltage is present and resistance is out of spec, replace the purge valve.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but it may cause increased emissions and could lead to a failed emissions test. It's best to repair it promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.