What The Sources Say About It
- Ford closes the canister vent solenoid to seal the system for the leak test. (source)
- On Ford's test, a vent valve stuck open sets P0455 and a vent valve stuck closed sets P1450. (source)
- GM says the vent valve draws fresh air through a vent at the filler pipe. Dirt or water there can restrict flow, corrode the valve, and make the tank hard to fill. (source)
- Honda traces stuck closed vent codes to dirt in the canister vent tube. (source)
- Kia traces vent codes to spider nests or other objects in the vent hose, most often at the filler neck. (source)
Codes That Point Here
P0446Canister Vent Solenoid CircuitP0449Evap Emission System Vent Valve/solenoid CircuitP2422Evap Canister Vent Shut Valve Stuck Closed Malfunction
What It Costs
Published estimates put a vent valve at $182 at YourMechanic. See every price row. For a real example of pricing the test before the part, see a smoke test we ran on a 2005 E55.
By Anthony Limpert, co-founder of Supercanic in San Jacinto, California, a shop with ASE certified mechanics. Updated November 12, 2026.
Author Source EEAT Authors · Anthony's Author Page
Sources For This Page
- 2009 MY OBD System Operation Summary for Hybrid Electric Vehicles (revised May 22, 2008), Ford Motor Company, read 2026-11-12
- Service Bulletin 09-06-04-028D, P0442, P0446, P0455, P0449, hard to fill (April 2014), General Motors, read 2026-11-12
- Service Bulletin 20-002, MIL Comes On with DTC P2422, Ridgeline (March 3, 2020), American Honda Motor Co., read 2026-11-12
- TSB PS532 Rev 1, DTC P0449 and P2422, Sportage (December 5, 2018), Kia, read 2026-11-12
- Evaporation Vent Solenoid Replacement, YourMechanic, read 2026-11-12