What it means
The control signal for injection pump metering channel F is below the expected window. Wire shorted to ground or actuator short.
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
The injection pump uses channel F to meter fuel through a cam, rotor, or injector path, depending on the system. The control module sets this code when the channel F control signal falls below its expected range, which can happen with a short to ground or a shorted actuator.
Common causes
Most likely first.
- Control wire shorted to ground
- Internal short in metering actuator
Symptoms
- Check-engine light
- Rough running or hesitation
- Reduced engine power
- Hard starting
How to diagnose it
- Record freeze-frame data and check live channel F command and feedback to confirm the low-signal fault and when it occurs.
- Inspect channel F wiring for chafing, crushed sections, or contact with ground, and check its connector for moisture or corrosion.
- Use the wiring diagram to test the channel F control wire for a short to ground, following the manufacturer's isolation procedure.
- Check the actuator coil and circuit for a short using the manufacturer's test method and specification.
- If the wiring and actuator test normally, verify the module's channel F output and related feedback before replacing parts.
Common fixes
- Repair a channel F wire shorted to ground.
- Clean or repair corroded channel F connector terminals.
- Replace the channel F actuator if it fails the specified short-circuit test.
- Repair a failed control-side connection if testing locates the fault there.
Can I keep driving?
Avoid heavy loads and long trips if the engine is rough, hesitant, or down on power. Stop if it stalls or cannot maintain safe traffic speed, since the low channel F signal can interfere with fuel delivery.
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.