Powertrain, generic (extended)

P2422 EVAP System Vent Valve Stuck Closed

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2422 is the opposite case: the vent path stays shut even with the valve commanded open, so tank pressure or vacuum cannot equalise. GM's Volt table (16OBDG01) is specific: with more than 697 Pa of pressure or vacuum in the sealed tank, the diurnal control valve is opened, and a fuel tank pressure change of less than 249 Pa within 10 s fails the test, Type B. Honda (bulletin 15-010, 2013-2015 Accord; later Ridgeline and Pilot) blames dirt that plugs the vent tube of the canister and fits a new canister plus tube. Hyundai revised the detection logic for the 2020 Sonata 2.5 GDI by ECM update (campaign 962), and Porsche and Bentley plug-in hybrids use it for the tank isolation valve. Refuelling may become difficult.

Likely causes

Dust, dirt or insects blocking the canister vent tube or filter
Vent valve or tank isolation valve stuck closed
Detection logic needing an update (Hyundai 2020 Sonata)

Symptoms

  • Check engine light
  • Fuel nozzle shuts off early when refuelling
  • Hissing when the fuel cap or flap is opened

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–600
Time0.5–2 h

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

Parts involved

evap vent valveevap canister

Related codes

P2421P0446P0449P0451P0498

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.