P2404 — EVAP System Leak Detection Pump Sense Circuit Range/Performance

P2404: EVAP System Leak Detection Pump Sense Circuit Range/Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

EVAP System Leak Detection Pump Sense Circuit Range/Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The engine or emissions warning may appear with few other symptoms.
  • The EVAP leak-monitoring sequence may not complete correctly.

Possible causes

  • Incorrect leak-detection pump feedback from a faulty pump, blocked filter or a restricted vapor line.
  • EVAP leaks, damaged sensor wiring or loose pump connections can also distort the monitored response.

What to check

  • Read all EVAP faults, then inspect vapor hoses and the tank-cap seal for visible defects.
  • Examine pump wiring and connectors, and check the pump inlet or filter for restrictions.
  • Run the vehicle-specific EVAP test and compare the reported pump-sense feedback with the expected response before replacing parts.

Also written as: P2404-00, P240400 (some scan tools add the fault-type byte, e.g. -00).