What it means
The cylinder 5 alternative-fuel injector control circuit has a range or performance fault. The code does not specify current ramp, dwell, peak voltage, or a particular cause.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The control module operates the alternative-fuel injector for cylinder 5 through a dedicated driver circuit. P22EC sets when the circuit's behaviour falls outside the expected range or performance, but the code alone does not identify a particular electrical measurement or prove that the injector is clogged.
Common causes
Most likely first.
- Alternative-fuel injector fault
- Wiring or connector fault
- Control-module driver fault
Symptoms
- Check engine light on
- Misfire or rough idle on the affected cylinder
- Increased fuel consumption
- Possible fuel smell or smoke from exhaust
How to diagnose it
- Record freeze-frame data and review live cylinder 5 misfire and fuel-system data to identify the conditions present when the fault set.
- Inspect the cylinder 5 alternative-fuel injector connector and harness for loose or damaged terminals, corrosion, chafing, or poor repairs.
- Compare the cylinder 5 injector circuit with the manufacturer's diagnostic information and, where available, compare its operation with other cylinders.
- Check the injector winding and circuit continuity using the manufacturer's procedure to distinguish an injector fault from a wiring fault.
- If the injector and harness pass, test the cylinder 5 control-module driver according to the manufacturer's procedure.
Common fixes
- Restore a loose or corroded connection at the cylinder 5 injector.
- Repair damaged wiring or connector terminals in the cylinder 5 control circuit.
- Replace the cylinder 5 alternative-fuel injector if testing confirms it is faulty.
- Repair or replace the control module if its cylinder 5 driver is confirmed faulty.
Can I keep driving?
If there is no severe misfire, drive gently and arrange diagnosis soon; avoid heavy loads if the engine runs roughly. Continued misfiring can raise emissions and may damage the exhaust catalyst.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.