P2400 — EVAP System Leak Detection Pump Control Circuit/Open

P2400: EVAP System Leak Detection Pump Control Circuit/Open — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

EVAP System Leak Detection Pump Control Circuit/Open. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • The check-engine light may illuminate while the vehicle otherwise drives normally.
  • An EVAP monitoring fault may be reported during an emissions-system test.

Possible causes

  • Open or damaged wiring, a loose or corroded connector in the leak-detection pump control circuit.
  • A defective detection pump or, less commonly, its controller may interrupt the electrical command.

What to check

  • Record P2400 and any companion EVAP codes before clearing them.
  • Inspect the pump connector and control wiring for disconnection, corrosion or damage.
  • Check supply, ground and control-circuit continuity to the vehicle's wiring diagram; verify commanded pump operation before replacing a component.

Also written as: P2400-00, P240000 (some scan tools add the fault-type byte, e.g. -00).