Powertrain, generic (extended)

P22E6 Cylinder 4 Alternative Fuel Injector Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22E6 reports a low signal on the cylinder 4 gas injector control wire. TransEco Energy's AFCM table gives short to ground or open as the cause and turns the MIL on in bi-fuel installations, keeping the same failure response as for gasoline; Ford's 2014 code list carries P22E6 with the MIL as well. On Ford's 2003 bi-fuel CNG system the control module would only start the engine on gas once rail pressure reached about 517 kPa, so a failed gas start alone does not prove an injector fault: check for this code first. A grounded line can hold cylinder 4 permanently open and flood it; an interrupted one leaves it dry. P22E7 is the high side, P22E5 the plain open circuit, and P0270 the gasoline injector code.

Likely causes

Cylinder 4 control wire grounded through damaged insulation
Separated terminal or broken wire in the cylinder 4 circuit
Damaged driver output in the gas control module

Symptoms

  • Malfunction indicator lamp on
  • Cylinder 4 runs rich or cuts out on gas
  • Engine stays on or returns 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

P22E5P22E7P22E8P22E2P0270P0304

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