Powertrain, generic (extended)

P26B3 Fuel Shutoff Valve A Control Circuit Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Fuel shut-off valves are electrically opened valves that isolate a gaseous or liquefied fuel, as on CNG or propane systems. P26B3 says valve A does not achieve its intended effect although it was commanded. Roush CleanTech documents it for its fourth-generation propane system on Ford E- and F-Series trucks (2016–2018), where it shares a check with P009E: at key-up the PCM reads rail pressure to see whether the rail was bled, and pressure still present at that point sets the code. Roush names a leaking check valve or a leaking supply solenoid in the rail pressure module, a clogged bleed restrictor or a kinked EVAP line. Its MIL status differs by vehicle. The result can be hard starting. P0005 is the electrical open on valve A; P26B4 is the stuck-on case.

Likely causes

Leaking check valve or supply solenoid in the rail pressure module
Clogged bleed restrictor or kinked EVAP line
Shut-off valve A not switching as commanded
Blown fuse in the valve supply

Symptoms

  • Hard starting after the vehicle has been parked
  • Check engine light on some vehicles
  • Possible fuel odour

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time1–4 h

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

Parts involved

fuel shutoff valve asolenoid

Related codes

P26B4P26B5P0005P009E

References: roushcleantech.com, law.cornell.edu, static.nhtsa.gov.