What it means
The ECM detects a generic fault on the diesel fuel presence sensor circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The diesel fuel presence sensor provides a reading used by the engine control module to assess the fuel system; its exact application can vary by vehicle. This circuit code means the module has detected a fault that makes the sensor reading unreliable, without specifying whether the signal is too low, too high, or implausible.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- Check-engine light on
- Fuel-system warning light, if equipped
- Reduced power or rough running
How to diagnose it
- Read freeze-frame data and check related fuel-system warnings and live sensor data to see whether the circuit fault coincides with rough running or reduced power.
- Locate the diesel fuel presence sensor using vehicle service information and inspect its connector and wiring for damage, moisture, corrosion, or loose terminals.
- Check the sensor's power, ground, and signal circuit connections against the wiring diagram, looking for opens, shorts, or excessive resistance.
- If supported by the scan tool, compare the sensor reading with related fuel-system data and note whether it is missing, fixed, or changing implausibly.
- If the wiring and supply circuits pass, test the sensor according to the manufacturer's procedure and replace it only if it fails.
Common fixes
- Reconnect or clean a loose or corroded sensor connector.
- Repair damaged wiring or restore an open or poor ground in the sensor circuit.
- Replace the diesel fuel presence sensor if it fails testing.
- Clear the code and confirm the sensor reading and fuel-system operation after repair.
Can I keep driving?
If the engine runs normally and no fuel-system warning indicates contamination, limit driving and arrange diagnosis soon. Avoid hard acceleration; stop if the engine runs roughly, loses power, or a fuel contamination warning appears, since unreliable fuel information can affect engine operation.
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.