Powertrain, generic (extended)

P22F5 Cylinder 8 Alternative Fuel Injector Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Open-circuit code for the gas injector of cylinder 8. No manufacturer documents this code publicly. In the two manufacturer-side lists found, the Ford overview from 2014 and TransEco's sheet for gas-converted Ford V8 and V10 trucks, cylinder 8 has only P22F6 and P22F7, and the TransEco table explicitly assigns an open line to P22F6. CARB permits this shortcut for output circuits. Where P22F5 is used, the module would flag it when no current flows through the cylinder 8 valve after it is commanded on. Typical findings are a pulled or corroded plug at the rear of the bank, a wire broken by engine movement or an internally open coil. That cylinder then gets no gas, while gasoline mode stays usable on bi-fuel trucks.

Likely causes

Cylinder 8 injector plug corroded or disconnected
Wire fatigued at a flex point of the gas harness
Coil of the cylinder 8 gas valve open

Symptoms

  • Cylinder 8 misfire whenever the engine runs on gas
  • Change to gasoline on bi-fuel vehicles
  • Check engine light on

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€60–500
Time0.5–2.5 h

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

Parts involved

alternative fuel injector

Related codes

P22F6P22F7P22F8P22F1P0208P0308

References: law.cornell.edu, http:, performanceparts.ford.com.