Powertrain, generic (extended)

P24C1 EVAP System Leak Detection Pump Switching Valve Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P24C1 means the switching valve does not respond when commanded, so the vent path stays where it was. Mitsubishi's 2023 Outlander PHEV recognises this after the reference measurement of the engine-off leak test: energising the valve should change the canister pressure, and if the difference to the first or second reference value stays below a limit for 10 s, the code is stored. Mitsubishi calls this valve stuck open and first rules out P24BE or P24BF, since a dead circuit looks the same from the pressure side. The fuel door locks and a refuelling-system message appears, but purge stays permitted. The fix is usually the complete leak check module. Stuck in the energised position is P24C0.

Likely causes

Switching valve stuck in rest position inside the module
Open or shorted valve circuit so the valve never moves
Dirt or water from the vent line jamming the valve seat

Symptoms

  • Malfunction indicator lamp on
  • Fuel filler door does not open
  • EVAP readiness not set

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

Related codes

P24C0P24BDP24BEP24BFP2450P2451

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