Powertrain, generic (extended)

P22F3 Cylinder 7 Alternative Fuel Injector Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Here the cylinder 7 gas valve drive line is held high, so the output stage cannot switch the valve on. Ford's 2014 list carries P22F3 with MIL; the Altech-Eco/TransEco table for its Ford V8 and V10 CNG systems names a short to power as cause, applies MIL only to bi-fuel trucks and notes that gas module version 1.4 cannot detect this fault itself. Compared with the Low code the picture is clearer: the valve stays shut and cylinder 7 receives no gas, giving a lean misfire on gas while gasoline operation is unaffected. On a dedicated CNG engine there is no second fuel, so the misfire persists until repaired. Under CARB rules such circuit checks run continuously.

Likely causes

Cylinder 7 control wire shorted to a switched or battery feed
Wiring error at the splice between factory and gas harness
Output stage in the control module open

Symptoms

  • Lean misfire on cylinder 7 in gas mode
  • Check engine light on (bi-fuel versions)
  • Gas operation dropped in favour of gasoline

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–600
Time0.5–3 h

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

Parts involved

alternative fuel injector

Related codes

P22F1P22F2P22F4P22EFP22F7P0207

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