EVAP Purge Valve Stuck Open Code P1444
The P1444 code indicates a malfunction in the EVAP canister purge valve control circuit, specifically that the valve is stuck in the open position. The powertrain control module (PCM) monitors vacuum drop and flow within the EVAP system; if it detects continuous flow when the valve should be closed, it sets this code. This condition allows fuel vapors to enter the intake manifold at unwanted times, disrupting the air-fuel mixture.
01. Most Common Causes
- EVAP canister purge valve mechanically stuck open
- Short circuit to voltage in the purge valve control wiring
- Corroded or loose electrical connector at the purge valve
- Internal PCM output driver failure
- Purge valve physically stuck open due to carbon or debris
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or poor engine performance
- Possible fuel odor
- Failed emissions test
03. Step-by-Step Diagnosis
Scan for codes and verify P1444 is present
Inspect the purge valve and its electrical connector for damage or corrosion
Test the purge valve operation using a scan tool or manual vacuum/voltage test
Check for short circuits or open circuits in the wiring between the PCM and purge valve
If wiring and valve are okay, test the PCM output driver
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, but it may cause rough idle and increased emissions. It's best to repair it soon to avoid potential drivability issues.
How much does it cost to fix?▼
Typically $150 to $400, including parts and labor, depending on the cause and vehicle.