P22EF code meaning
Cylinder 6 Alternative Fuel Injector Control Circuit High
Powertrain system Generic code P22xx codes Check engine light
What P22EF means
The counterpart to P22EE: the drive line of the cylinder 6 gas injector stays near battery voltage even when the output stage should pull it down. For Ford pickups and vans converted with the Altech-Eco/TransEco CNG kit, the installer sheet gives as cause is a short to power; the same MIL rule applies (on for bi-fuel, off for dedicated CNG), and the column for the gas module version 1.4 marks this fault as not detected there, so on such units only the PCM catches it. Ford carries P22EF with MIL in its 2014 code list. Because the valve can no longer be opened, cylinder 6 runs lean or misfires while on gas, and a bi-fuel engine typically falls back to gasoline. Open wires are not reported here but under the Low code.
P22EF at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P22EF
- Check engine light on (bi-fuel versions)
- Lean misfire on cylinder 6 in gas mode
- Automatic change to gasoline operation
Common causes of P22EF
- Most likelyControl wire of the cylinder 6 gas injector touching a battery-voltage feed
- PossibleGas harness spliced or pinned incorrectly during the conversion
- Less likelyMoisture bridging supply and control pins in the injector plug
- Less likelyOutput stage in the control module no longer switches
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 P22EF 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). |
| EF | The exact fault in that area. |
What to do next
- Note P22EF 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 P22EF
What does P22EF mean?
P22EF means "Cylinder 6 Alternative Fuel Injector Control Circuit High". The counterpart to P22EE: the drive line of the cylinder 6 gas injector stays near battery voltage even when the output stage should pull it down. It is a generic code, so it means the same on every make.
Is it safe to drive with P22EF?
Drive gently and only to a workshop. With P22EF the car can go into limp mode (reduced power) to protect itself.
Will P22EF fail an emissions test?
Yes, it can. P22EF 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 P22EF to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P22EF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.