P244A: Diesel Particulate Filter Differential Pressure Too Low (Bank 1)

P244A means the differential pressure sensor across the diesel particulate filter is reading below the expected range for the current engine load. The ECU expects some pressure differential because exhaust gas meets flow resistance from the filter substrate. A reading that is too low usually points to one of three things: the sensor itself is faulty or has a clogged pressure tube, the DPF has been physically removed (a delete), or there is an exhaust leak between the turbo and the DPF inlet.

P244A è un codice diagnostico di guasto relativo a emissioni, classificato con gravità moderate. Quando la centralina (ECU) del tuo veicolo rileva questa condizione, memorizza P244A e accende la spia motore.

Se il tuo veicolo ha attivato P244A, potresti notare uno o più di questi sintomi:

• Check engine light
• Often no driveability symptoms if the sensor is at fault
• Possible "DPF regeneration not possible" warning on dash
• Loss of power if the ECU compensates by limiting boost
• On deleted DPFs: no symptoms beyond the light, sometimes louder exhaust note

Ecco le cause più comuni di P244A, ordinate in base alla probabilità che siano la causa del problema:

In genere sì, per brevi tragitti. Safe in the short term. The code itself does not affect driveability, but it points to either a sensor problem or a missing DPF. If the filter has been deleted, the vehicle will not pass any EU emissions inspection (TÜV, ITV, TA, SKP) and may be illegal to register in some member states.

Segui questi passaggi per individuare la causa principale di P244A:

1. Read live data values for DPF inlet pressure, outlet pressure and the calculated differential. Compare to the manufacturer specification at idle. A near-zero reading across all load points points to a sensor or tube issue, not an exhaust flow issue
2. Visually inspect the two pressure sensing tubes (a thin metal pipe and a rubber section on most diesels). Look for soot blockage, cracks, or a disconnected end. A blocked tube reads near zero regardless of actual pressure
3. Confirm the DPF is physically present by inspecting the exhaust under the vehicle. A deleted DPF leaves a straight section of pipe where the canister used to be. This check takes 30 seconds with a torch and is the single most useful step on an imported used car
4. Test the differential pressure sensor with a multimeter. Reference voltage should be around 5 V, signal voltage should rise with engine load. A flat-line signal at low voltage confirms a failed sensor
5. If the sensor and tubes are good and the DPF is present, look for an exhaust leak between the turbo outlet and the DPF inlet. A leak vents exhaust to atmosphere before it reaches the DPF, dropping the pressure differential
6. Check DPF regeneration history with the scan tool. A healthy DPF shows hundreds of completed regenerations over the vehicle's life. Zero regenerations on a high-mileage car is a strong sign the filter has been deleted at the software level

I costi di riparazione di P244A variano a seconda della causa principale e del tuo veicolo. Ecco le stime tipiche:

P244A si comporta in modo diverso a seconda del tuo veicolo. Seleziona la tua auto qui sotto per cause specifiche del modello, problemi noti e stime dei costi adeguate:

Questi codici compaiono spesso insieme a P244A o indicano problemi correlati: