What it means
Cylinder 8 alternative-fuel injector is electrically OK but its response (current ramp, dwell, peak voltage) is off-spec — typically winding ageing.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The engine control module drives the alternative-fuel injector for cylinder 8 and monitors how its electrical response behaves. This code indicates that the circuit is not simply detected as low or high, but the injector's response is outside the expected range or performance pattern. An aged injector winding or another injector fault can affect cylinder 8 fueling and cause a misfire.
Common causes
Most likely first.
- Winding ageing
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
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 check live misfire data for cylinder 8 to see whether the fault coincides with rough running.
- Inspect the cylinder 8 injector connector and harness for corrosion, loose pins, heat damage, or intermittent contact.
- Compare the injector's electrical response with other cylinders using the scan tool or test method specified by the manufacturer.
- Check the cylinder 8 injector winding and driver circuit according to the manufacturer's procedure.
- If the electrical checks pass, verify injector operation and fuel delivery using the vehicle's service information.
Common fixes
- Clean or repair poor connections at the cylinder 8 injector connector.
- Repair damaged wiring or an intermittent harness connection.
- Replace the cylinder 8 alternative-fuel injector if its response or winding fails the specified test.
- Repair the injector control driver if the manufacturer's diagnostic procedure confirms a driver fault.
Can I keep driving?
Limit driving if the engine is rough or misfiring, and avoid heavy acceleration. Continued cylinder 8 misfire can increase fuel use and damage emissions components; stop if fuel smell or smoke appears.
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.