What it means
The drive circuit for the cylinder 1 alternative-fuel injector is open. Bi-fuel vehicles have a second set of injectors for CNG, LPG, or hydrogen — separate from the petrol/diesel injectors.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
On a bi-fuel vehicle, the alternative-fuel injector supplies fuel to cylinder 1 separately from the petrol or diesel injector. The control module monitors the injector's drive circuit and sets this code when it detects an open circuit, which can prevent the cylinder 1 alternative-fuel injector from operating.
Common causes
Most likely first.
- Injector winding open
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
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
- Check freeze-frame data and misfire counts, and confirm whether the engine was running on alternative fuel when the cylinder 1 fault occurred.
- Inspect the cylinder 1 alternative-fuel injector connector for a backed-out pin, poor fit, corrosion, or damaged wiring.
- Check the injector winding and circuit continuity using the manufacturer's procedure to determine whether the injector or wiring is open.
- Trace the circuit between the cylinder 1 injector and its control module, checking for breaks and loose connections.
- If the injector and harness pass, test the module driver and related connections using the manufacturer's diagnostic procedure.
Common fixes
- Seat or repair a backed-out cylinder 1 injector connector pin.
- Repair an open or damaged wire in the cylinder 1 injector circuit.
- Replace the cylinder 1 alternative-fuel injector if its winding is open.
- Repair the control-module connection or driver if testing confirms it is faulty.
Can I keep driving?
Avoid running on alternative fuel if cylinder 1 is misfiring; an active misfire can damage the catalytic converter and worsen fuel use. If the engine runs smoothly on its other fuel, drive gently only as needed and switch fuels according to the vehicle's instructions.
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.