Powertrain, generic (extended)

P22E7 Cylinder 4 Alternative Fuel Injector Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22E7 says the control circuit of the cylinder 4 gas injector reads high. TransEco Energy's fault table blames a short to power and lights the MIL for bi-fuel use; Ford's 2014 code list also marks P22E7 as a MIL code. The injector then cannot open and cylinder 4 misfires lean whenever gas is selected. Timing matters for diagnosis: GM's 2015 bi-fuel Impala starts on gasoline below about -20 °C and only moves to CNG once coolant reaches 50 °C, so on such cars the fault may appear only after warm-up. Check the wire for contact with a live feed and measure the injector coil for internal shorts. P22E6 is the low side; P0271 is the corresponding code for the gasoline injector of cylinder 4.

Likely causes

Cylinder 4 control wire in contact with a 12 V circuit
Cylinder 4 injector coil with internal short
Output stage of the controlling module defective

Symptoms

  • Malfunction indicator lamp on
  • Cylinder 4 misfire only after the switch to gas
  • Reduced power in gas mode

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

P22E5P22E6P22E8P22E3P0271P0304

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