Powertrain, generic (extended)

P22F6 Cylinder 8 Alternative Fuel Injector Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Cylinder 8 is the last cylinder with a generic gas injector code; beyond it the Altech-Eco/TransEco table for the Ford 6.8 V10 switches to manufacturer codes. P22F6 reports a control line for the cylinder 8 valve that is too low. That table counts a short to ground as well as an open line here, with MIL on bi-fuel vehicles only, and Ford's 2014 code list includes the code with MIL. For the driver the effect depends on the fault: a grounded line may keep gas flowing into cylinder 8 and enrich it, a broken one shuts it off. Either way the misfire shows up only in gas mode, which helps separate it from a gasoline injector fault such as P0208. Repair starts with the plug and harness at that valve.

Likely causes

Cylinder 8 control wire grounded through damaged insulation
Open wire or unplugged injector (reported as Low)
Cylinder 8 gas injector coil defective

Symptoms

  • Check engine light on (bi-fuel versions)
  • Misfire on cylinder 8 only in gas mode
  • Gas mode not available

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

P22F5P22F7P22F8P22F2P0208P0308

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