Powertrain, generic (extended)

P2418 EVAP System Switching Valve Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2418 is the electrical check of the control circuit of the EVAP switching valve - an extra valve in the evaporative system whose job depends on the design. Ford calls it EVAP switching valve or vapor blocking valve; its 2012 and 2020-2023 OBD summaries check the driver continuously and set P2418 when a short, open or intermittent fault persists for more than 5 s, so at Ford this one code covers all circuit faults. Karma's Revero and GS-6 bulletin uses P2418 for the open control circuit of the rear fuel tank isolation valve driven by the ECM. P2419/P2420 separate low and high circuit faults, P2450 is the mechanical stuck-open fault. While the valve cannot be controlled, leak tests are suspended and fuel vapour odour or refuelling trouble may follow.

Likely causes

Broken control wire or unplugged valve connector
Open solenoid coil in the switching valve
Corroded connector near the tank (road salt, splash water)

Symptoms

  • Check engine light
  • EVAP readiness not set
  • Possible fuel vapour odour or slow refuelling

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–350
Time0.5–2.5 h

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

Parts involved

evap switching valvevalve wiringecm

Related codes

P2419P2420P2450P2451

References: law.cornell.edu, newtonnet.co.uk, static.nhtsa.gov, fordservicecontent.com.