Powertrain, generic (extended)

P24C0 EVAP System Leak Detection Pump Switching Valve Stuck On

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

P24C0 is a mechanical fault found during the leak test itself: the switching valve stays in its energised position, or the pump around it does not do its job. Mitsubishi's 2023 Outlander PHEV checks this when the parked car wakes its controller 5 h, 6 h or 8.5 h after shutdown. While the reference pressure is being measured, the canister pressure must fall at a set rate; if it drops too slowly or the pump cannot pull it down, the code sets after 1 s below the limit. Mitsubishi groups a stuck valve with a pump stuck on or off and a frozen sensor, all inside the ELCM, and asks to clear P24BE or P24BF first. Mitsubishi then disables canister purging and locks the filler flap. A valve stuck in rest position is P24C1.

Likely causes

Switching valve mechanically stuck inside the leak check module

Leak detection pump stuck on or not running

Open or shorted pump circuit or connector damage

Module pressure sensor frozen at one value

Symptoms

Malfunction indicator lamp on
Fuel filler door does not open
Refuelling system service message

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€150–600

Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

evap leak detection pump switching valve

References: mitsubishitechinfo.com, law.cornell.edu.