P2450EVAP System Switching Valve Performance/Stuck Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- 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.
- What you may notice
- Malfunction indicator lamp on, usually no noticeable driving change
- Possible fuel odor near the tank area
- Likely causes
- LikelySwitching valve sticking open or not sealing
- PossibleInternal fault of a leak detection pump that houses the valve
- PossibleMonitor software needing an update (known on some Ford trucks)
- RareCracked or loose vapor hose at the valve
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.