P22DF code meaning
Cylinder 2 Alternative Fuel Injector Control Circuit High
Powertrain system Generic code P22xx codes Check engine light
What P22DF means
P22DF indicates that the control circuit of the cylinder 2 gas injector reads high, which TransEco Energy's AFCM table attributes to a short to power; MIL on for bi-fuel use. Ford's 2014 code list likewise flags P22DF for the MIL. A line stuck at supply voltage keeps the injector closed, so cylinder 2 burns no gas and misfires lean, while running on gasoline is unaffected. On GM's 2015 bi-fuel Impala the ECM drives the CNG injectors itself and, if it sees a fuel delivery problem in one system, changes over to the other, so the driver may only notice a switch back to gasoline. A coil with internal shorts can produce the same overcurrent. P22DE is the low side; P0265 is the high-side code of the gasoline injector.
P22DF 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 P22DF
- Malfunction indicator lamp on
- Cylinder 2 misfires only on gas
- Unexpected return to gasoline
Common causes of P22DF
- Most likelyCylinder 2 control wire touching a live supply wire
- PossibleInternal short in the cylinder 2 gas injector coil
- Less likelyDriver protection in the control module tripping due to a fault
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 P22DF 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). |
| DF | The exact fault in that area. |
What to do next
- Note P22DF 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 P22DF
What does P22DF mean?
P22DF means "Cylinder 2 Alternative Fuel Injector Control Circuit High". P22DF indicates that the control circuit of the cylinder 2 gas injector reads high, which TransEco Energy's AFCM table attributes to a short to power; MIL on for bi-fuel use. It is a generic code, so it means the same on every make.
Is it safe to drive with P22DF?
Drive gently and only to a workshop. With P22DF the car can go into limp mode (reduced power) to protect itself.
Will P22DF fail an emissions test?
Yes, it can. P22DF 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 P22DF to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P22DF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.