Powertrain, generic (extended)

P2450 EVAP System Switching Valve Performance/Stuck Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

The switching valve sits in the evaporative system and either seals off part of it during the leak test or redirects flow; P2450 means the valve does not do its job or remains open. Ford calls it the vapor blocking valve: in 2020 to 2024 gasoline models the check runs in the third phase of the 0.040 inch cruise leak test, lasts 2 to 3 s and fails when a calculated ratio stays below 2.75 (Mode 6 test $3D, component $82). VW's 2014 Golf builds the valve into the leak detection pump and fails it when pump current differs from the reference by less than 3 mA. Bentley's V8 models of 2019 to 2021 point to the pump wiring, a smoke test and then the pump itself; Ford fixed P2450 on 2018 F-150s with a PCM update. The electrical faults of the same valve are P2418 to P2420; stuck closed is P2451.

Likely causes

Switching valve sticking open or not sealing
Internal fault of a leak detection pump that houses the valve
Monitor software needing an update (known on some Ford trucks)
Cracked or loose vapor hose at the valve

Symptoms

  • Malfunction indicator lamp on, usually no noticeable driving change
  • Possible fuel odor near the tank area

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–450
Time0.3–2 h

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

Parts involved

evap switching valveevap canister

Related codes

P2451P2418P2419P2420P0455P0456

References: fordservicecontent.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.