What it means
The supply rail to injector group F is open, so none of the injectors in this group can fire. The affected cylinders produce no power and the engine runs rough or on reduced cylinders. Causes: a broken supply wire, an open relay or fuse, or a disconnected group-F supply connector.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Injector group F is supplied by a shared electrical feed for the injectors in that group. This code indicates the control module has detected an open in that group F supply circuit, which can prevent the affected injectors from firing and leave their cylinders misfiring or without power.
Common causes
Most likely first.
- Open supply wire or blown fuse
- 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
- Record freeze-frame data and check cylinder-specific misfire information to determine whether the affected cylinders are served by injector group F.
- With the ignition off, inspect the group F supply connector and wiring for a disconnected plug, broken conductor, corrosion, or a pushed-back terminal.
- Use the vehicle's wiring information to locate the group F fuse and supply relay, if fitted, and check them for an open or poor connection.
- Following the manufacturer's procedure, check for supply voltage at the group F feed and trace the circuit to locate where voltage is lost.
- If the fuse, relay, and visible wiring are sound, test circuit continuity and module connections before suspecting an internal control module fault.
Common fixes
- Reconnect the group F supply connector or secure a loose terminal.
- Replace a failed fuse after checking why it opened, or repair the faulty supply relay.
- Repair the open conductor in the injector group F supply harness.
- Repair an internal module connection only after the external circuit has tested correctly.
Can I keep driving?
Do not continue a long drive with a persistent misfire; if the engine runs steadily enough, drive gently for a short distance to reach repair. Unburned fuel can damage the catalytic converter, and reduced power can make traffic maneuvers unsafe.
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.