Powertrain, generic (extended)

P22DA Cylinder 1 Alternative Fuel Injector Control Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22DA means the cylinder 1 gas injector control wire reads too low. TransEco Energy's DTC list for its CNG control module (AFCM v1.4) blames either a grounded wire or an open line, turns on the MIL in bi-fuel installations and reacts the same way it would to the matching gasoline injector fault. Ford's 2014 OBD code list carries P22DA as a MIL code as well. With a low-side driver, a control wire touching ground can keep the injector energized whenever its supply is live, so cylinder 1 may get gas without pause and run very rich; an interrupted wire leaves it without gas. P22DB covers the high side and P22D9 the plain open circuit. The gasoline injector of the same cylinder reports through P0261 instead.

Likely causes

Control wire of the cylinder 1 gas injector chafed through to ground
Interrupted control wire or connector (logged as Low by some modules)
Water or corrosion in the injector connector
Faulty output stage in the gas control module

Symptoms

  • Malfunction indicator lamp on
  • Very rough running on cylinder 1 in gas mode, possibly rich misfire
  • Gas system switches back 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

P22D9P22DBP22DCP22DEP0261P0301

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