Powertrain, generic (extended)

P22DB Cylinder 1 Alternative Fuel Injector Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22DB flags a control circuit of the cylinder 1 gas injector that stays too high. TransEco Energy's AFCM fault list traces it to a short to battery voltage, lights the MIL for bi-fuel use and applies the same fallback as for the gasoline injector fault; Ford's 2014 code list also marks P22DB for the MIL. When the line is held at supply voltage, the driver cannot pull it down, so the injector never opens and cylinder 1 receives no gas: a lean misfire on that cylinder in gas mode is the typical result, often together with P0301. Many output stages also shut off to protect themselves from the excessive current. A coil with shorted turns can look the same. P22DA is the low side, P0262 the code for the gasoline injector.

Likely causes

Control wire shorted to battery or injector supply voltage
Shorted turns in the cylinder 1 gas injector coil
Output stage of the gas control module damaged

Symptoms

  • Malfunction indicator lamp on
  • Lean misfire on cylinder 1 in gas mode, often with P0301
  • Engine runs normally on 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

P22D9P22DAP22DCP22DFP0262P0301

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