Powertrain, generic (extended)

P22DC Cylinder 1 Alternative Fuel Injector Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P22DC is meant for a cylinder 1 gas injector whose circuit is electrically intact but whose response looks wrong, such as a current trace that never reaches its peak or does not fall back to the hold level, or a coil whose resistance has drifted. A Ford patent on driving a second type of injector through an interface (US 8,161,946) describes this logic: the injector counts as degraded if it ignores on and off commands or stays at peak current. No vehicle maker publishes P22DC; TransEco and Ford's 2014 list stop at Low/High. A sticking injector is a plausible trigger, which is why GM's bi-fuel pickups filter the gas through a coalescing element that keeps oil and liquids away from the injectors. Expect a misfiring cylinder 1 or a return to gasoline.

Likely causes

Cylinder 1 gas injector sticking from oil residue or debris in the gas
Injector coil resistance outside its specification
Weak supply voltage to the injector bank
Injector of the wrong type or impedance installed

Symptoms

  • Malfunction indicator lamp on
  • Uneven running in gas mode, misfire counts on cylinder 1
  • Higher gas consumption or switch back to gasoline

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–700
Time0.5–3 h

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

Parts involved

alternative fuel injector

Related codes

P22D9P22DAP22DBP22E0P0201P0301

References: patents.google.com, static.nhtsa.gov, law.cornell.edu.