Error code

OBD2 P0444

OBD2P0444
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Evaporative Emission System Purge Control Valve Circuit Open.

Severity

moderateCan drive but may experience rough idle, stalling, and increased fuel consumption.

Summary

P0444 indicates an open circuit in the evaporative emission (EVAP) canister purge control valve. This issue affects the EVAP system's ability to manage fuel vapors.

Symptoms

  • No symptoms other than a stored trouble code and possibly an illuminated warning light
  • A strong odor of fuel may be present
  • Engine idle quality may deteriorate, run rough at some throttle settings, or stall unpredictably if the purge valve is stuck open
  • Fuel consumption may increase

Common Causes

  • Damaged, burnt, shorted, or corroded wiring and/or connectors
  • Open circuits in the EVAP system
  • Purge valve stuck in the open position
  • Failed or failing PCM (rare)

Diagnosis

  1. Record all codes present and freeze frame data
  2. Inspect wiring for damage; repair as needed
  3. Perform input voltage, ground, continuity, and resistance checks on associated wiring
  4. Test the purge valve's internal resistance and operation

Fixes

  • Repair or replace damaged wiring and connectors
  • Replace the EVAP canister purge control valve if it is defective

FAQ

What does P0444 mean?

P0444 indicates an issue with the evaporative emission system's purge control valve circuit, typically due to wiring problems or a faulty valve.

How do I fix P0444?

Fixing P0444 involves inspecting and repairing damaged wiring, testing the purge valve for proper operation, and replacing any defective components.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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