Powertrain, generic (extended)

P22F1 Cylinder 7 Alternative Fuel Injector Control Circuit/Open

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

A general circuit or open-wire code for the gas injector of cylinder 7, which only exists on V8 and larger engines. No manufacturer documents this code publicly. Ford and the Altech-Eco/TransEco CNG system for Ford V8 and V10 trucks report an open circuit at this valve under the Low code P22F2 instead, which CARB allows: for output circuit faults a maker need not store separate codes for open, shorted low and shorted high. A manufacturer using P22F1 would set it when the driver sees no load current from the cylinder 7 valve, typically a severed wire, unplugged connector or burnt coil. In gas mode the cylinder gets no fuel and misfires; bi-fuel engines normally revert to gasoline.

Likely causes

Plug of the cylinder 7 gas injector loose or left off after service

Broken control or supply wire in the gas harness

Gas injector coil open internally

Symptoms

Misfire on cylinder 7 in gas mode
Fallback 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

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