P1440 — Definitions depend on the manufacturer

P1440: Definitions depend on the manufacturer — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Purge Valve Stuck Open. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check Engine light illumination
  • Rough engine idle
  • Decreased fuel economy
  • Difficulty starting the engine after refueling
  • Strong gasoline odor around the vehicle

Possible causes

  • Faulty EVAP purge valve stuck in the open position
  • Damaged or cracked vacuum hoses in the EVAP system
  • Electrical wiring issues or corroded connector pins
  • Clogged EVAP charcoal canister
  • Faulty fuel tank pressure sensor

What to check

  • Inspect the EVAP purge valve for debris or mechanical failure preventing closure
  • Test the purge valve solenoid electrical circuit for proper voltage and ground
  • Perform a vacuum test on the purge valve to verify it holds seal when closed
  • Examine all EVAP system hoses and connections for leaks or blockages
  • Verify the integrity of the charcoal canister for blockages or saturation

Also written as: P1440-00, P144000 (some scan tools add the fault-type byte, e.g. -00).