P22E0 Cylinder 2 Alternative Fuel Injector Control Circuit Range/Performance

P22E0 covers a cylinder 2 gas injector circuit that passes the plain open and short checks yet responds outside its expected window. California's OBD regulation asks for output components to be checked not only for circuit faults but also for a proper functional response; for alternate-fueled vehicles from 2004 to 2018 the gasoline rules applied unchanged, and from 2019 the maker submits its own monitoring plan. The Ford patent US 8,161,946 gives an example of such a functional check for an injector fed by an extra driver. No maker publishes P22E0 itself. Typical triggers are a sluggish or partly stuck injector, a coil past its specification or a driver that cannot deliver the needed current. Cylinder 2 then runs unevenly on gas.

Likely causes

Symptoms

• Malfunction indicator lamp on
• Uneven idle on gas, cylinder 2 misfire counts
• Fuel trim drifts in gas mode

Repair estimate

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

Parts involved

Related codes

References: law.cornell.edu, patents.google.com.