P22EC code meaning
Cylinder 5 Alternative Fuel Injector Control Circuit Range/Performance
Powertrain system Generic code P22xx codes Check engine light
What P22EC means
P22EC is the plausibility code for the cylinder 5 gas injector circuit on engines with five or more cylinders: wiring and coil pass the basic checks, but the injector does not respond as commanded. California's OBD rule requires such output components to be checked for a proper functional response, and from model year 2019 the maker of an alternate-fueled vehicle submits its own plan for which monitors apply. Ford's patent US 8,161,946 describes one way to do it, judging an injector by whether its current follows the peak-and-hold pattern. No maker publishes P22EC itself. A sticking armature, a heat-aged coil or a weak driver are the usual suspects. Bi-fuel cars may keep running on gas with a rough cylinder 5 or drop back to gasoline.
P22EC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P22EC
- Malfunction indicator lamp on
- Rough cylinder 5 on gas or return to gasoline
- Fuel trim on the affected bank drifts in gas mode
Common causes of P22EC
- Most likelySticking armature in the cylinder 5 gas injector
- PossibleHeat-aged coil with drifting resistance
- Less likelyDriver or supply not delivering the full opening current
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Alternative fuel injector
What each part of P22EC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| EC | The exact fault in that area. |
What to do next
- Note P22EC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P22EC
What does P22EC mean?
P22EC means "Cylinder 5 Alternative Fuel Injector Control Circuit Range/Performance". P22EC is the plausibility code for the cylinder 5 gas injector circuit on engines with five or more cylinders: wiring and coil pass the basic checks, but the injector does not respond as commanded. It is a generic code, so it means the same on every make.
Is it safe to drive with P22EC?
Drive gently and only to a workshop. With P22EC the car can go into limp mode (reduced power) to protect itself.
Will P22EC fail an emissions test?
Yes, it can. P22EC is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P22EC to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P22EC clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.