What it means
The cylinder 5 alternative-fuel injector control circuit has a voltage above the expected range. This indicates an electrical circuit fault, not necessarily an injector flow problem or short to battery.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The alternative-fuel injector for cylinder 5 is switched by a control-module driver through its own electrical circuit. The module monitors that circuit and sets P22EB when its voltage is higher than expected; that points to an electrical fault and does not by itself show whether the injector is delivering fuel.
Common causes
Most likely first.
- Short to B+
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
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
- Save the freeze-frame data and check live misfire data for cylinder 5 to see when the fault occurs and whether it affects that cylinder.
- With the engine off, inspect the cylinder 5 alternative-fuel injector connector and nearby harness for corrosion, loose pins, or a wire pinched against a power source.
- Compare the cylinder 5 control-circuit readings with the manufacturer's diagnostic information to confirm the high-voltage condition.
- With power isolated as specified by the manufacturer, check the circuit for an unintended connection to B+ and inspect connector contact quality.
- If the wiring and connections pass, test the cylinder 5 injector and control-module driver using the manufacturer's procedures.
Common fixes
- Clean or repair corroded terminals at the cylinder 5 alternative-fuel injector connector.
- Repair a cylinder 5 control wire pinched against a B+ source.
- Replace the cylinder 5 alternative-fuel injector if its electrical test fails.
- Repair or replace the control module only if its driver is confirmed faulty.
Can I keep driving?
If the engine runs smoothly, limit driving and avoid heavy acceleration until the fault is diagnosed. A cylinder 5 misfire can increase emissions and fuel use, and continued misfiring 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.