Powertrain, generic (extended)

P22DF Cylinder 2 Alternative Fuel Injector Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22DF indicates that the control circuit of the cylinder 2 gas injector reads high, which TransEco Energy's AFCM table attributes to a short to power; MIL on for bi-fuel use. Ford's 2014 code list likewise flags P22DF for the MIL. A line stuck at supply voltage keeps the injector closed, so cylinder 2 burns no gas and misfires lean, while running on gasoline is unaffected. On GM's 2015 bi-fuel Impala the ECM drives the CNG injectors itself and, if it sees a fuel delivery problem in one system, changes over to the other, so the driver may only notice a switch back to gasoline. A coil with internal shorts can produce the same overcurrent. P22DE is the low side; P0265 is the high-side code of the gasoline injector.

Likely causes

Cylinder 2 control wire touching a live supply wire
Internal short in the cylinder 2 gas injector coil
Driver protection in the control module tripping due to a fault

Symptoms

  • Malfunction indicator lamp on
  • Cylinder 2 misfires only on gas
  • Unexpected return to gasoline

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–450
Time0.5–3 h

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

Parts involved

alternative fuel injector

Related codes

P22DDP22DEP22E0P22DBP0265P0302

References: http:, performanceparts.ford.com, static.nhtsa.gov.