What it means
The control signal for injection pump metering channel F is above the expected window. Wire shorted to B+ or actuator open.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
- The engine or gearbox may go into limp mode
How it works
Injection pump channel F controls fuel metering through a cam, rotor, or injector path, depending on the system. The control module sets this code when the channel F signal rises above its expected range, which can result from a short to battery voltage or an open actuator.
Common causes
Most likely first.
- Control wire shorted to B+
- Open metering actuator
Symptoms
- Check-engine light
- Rough running or hesitation
- Reduced engine power
- Hard starting
How to diagnose it
- Save freeze-frame data and review live channel F command and feedback to confirm the high-signal condition and when it appears.
- Inspect channel F wiring for contact with a powered wire, heat damage, or connector problems that could leave the circuit open.
- Use the wiring diagram to test the channel F control wire for a short to battery voltage, following the manufacturer's isolation procedure.
- Check the actuator coil and connector continuity using the manufacturer's procedure to determine whether the actuator is open.
- If the wiring and actuator pass, verify the channel F control output and feedback circuit before considering a module fault.
Common fixes
- Repair a channel F wire shorted to battery voltage.
- Repair a loose, damaged, or corroded connector.
- Replace the channel F actuator if it is confirmed open.
- Repair a failed control-side connection if testing locates the fault there.
Can I keep driving?
Keep trips short and avoid heavy acceleration if the engine hesitates or loses power. Stop if it stalls or becomes unsafe to drive, because the high channel F signal can disrupt fuel metering.
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.