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.
High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
Cylinder 2 is numbered according to the manufacturer: check your engine's manual before working on it.
Symptoms
- Malfunction indicator lamp on
- Cylinder 2 misfires only on gas
- Unexpected return to gasoline
Most likely causes
- Cylinder 2 control wire touching a live supply wire
- Internal short in the cylinder 2 gas injector coil
- Driver protection in the control module tripping due to a fault
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
- It affects emissions.
What each character of P22DF means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 2: Fuel injection
- DF: Specific fault in that system
Frequently asked questions
Can I keep driving with code P22DF?
If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.
What causes code P22DF?
The most common causes are: cylinder 2 control wire touching a live supply wire; internal short in the cylinder 2 gas injector coil; driver protection in the control module tripping due to a fault.
Related codes
- P22DDCylinder 2 Alternative Fuel Injector Control Circuit/Open
- P22DECylinder 2 Alternative Fuel Injector Control Circuit Low
- P22E0Cylinder 2 Alternative Fuel Injector Control Circuit Range/Performance
- P22DBCylinder 1 Alternative Fuel Injector Control Circuit High
- P0265Cylinder 2 Injector A Circuit High
- P0302Cylinder 2 Misfire Detected
Sources
- transecoenergy.com: DTC List
- performanceparts.ford.com: 2014 BOSS 302S OBDII Codes
- static.nhtsa.gov: MC 10114282 9999
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.