P244B: Diesel Particulate Filter Differential Pressure Too High (Bank 1)

Was bedeutet P244B?

P244B means the differential pressure across the diesel particulate filter is higher than the ECU expects, indicating the filter is heavily loaded with soot. The most common cause is a DPF that has failed to complete its passive regeneration cycle because the vehicle is driven mostly on short urban trips. Less commonly, the pressure sensor itself is reading high, the DPF substrate has melted or cracked internally, or there is a downstream exhaust restriction.

P244B ist ein emissionen-bezogener Diagnosefehlercode mit dem Schweregrad high. Wenn das Steuergerät Ihres Fahrzeugs diesen Zustand erkennt, speichert es P244B und aktiviert die Motorkontrollleuchte.

Was sind die Symptome von P244B?

Wenn Ihr Fahrzeug P244B ausgelöst hat, bemerken Sie möglicherweise eines oder mehrere dieser Symptome:

• Check engine light
• Noticeable loss of power and slow throttle response
• DPF warning light or message on dash
• Engine running rough at idle or under load
• Black smoke from exhaust under acceleration
• Fuel economy drops by 10 to 20 percent
• On severe blockage: limp mode (engine power reduced to 50 percent or less)

Was verursacht P244B?

Hier sind die häufigsten Ursachen für P244B, geordnet nach Wahrscheinlichkeit:

Kann man mit P244B weiterfahren?

Im Allgemeinen ja, für kurze Strecken. Drivable in the short term, but treat as a priority repair. A heavily clogged DPF restricts exhaust flow, causes loss of power, can damage the turbocharger, and on some vehicles triggers limp mode after several drive cycles. Repair within days, not weeks.

Wie diagnostiziert man P244B?

Befolgen Sie diese Schritte, um die Grundursache von P244B zu ermitteln:

1. Read live data: DPF soot mass (grams), distance since last regeneration, count of completed regenerations, and current differential pressure. A soot mass above 30 to 40 grams with no recent regeneration confirms the filter is overloaded
2. Before any parts replacement, attempt a forced regeneration with a scan tool that supports it (most independent garages have this capability). A successful forced regen drops the soot mass to under 5 grams and can resolve P244B without further repair, especially on a vehicle that has been driven on short trips
3. If forced regeneration fails or the soot mass refuses to drop, the DPF is either physically damaged or so loaded that off-vehicle cleaning is needed. Off-vehicle cleaning takes 1 to 2 days at a specialist and saves 60 to 80 percent versus DPF replacement
4. Compare the differential pressure reading to manufacturer specification at idle. A reading that is high at idle but normal under load points to a faulty sensor rather than a clogged filter. The sensor is far cheaper to replace than the DPF
5. Inspect the DPF substrate with a borescope through the inlet flange. A cracked or melted substrate is visible and cannot be cleaned, only replaced. Catastrophic regeneration events (often after a misfire or rich condition) destroy the substrate
6. Confirm there is no downstream restriction by checking the exhaust system from DPF outlet to tailpipe. A collapsed muffler or crushed pipe section will mimic a clogged DPF

Was kostet die Reparatur von P244B?

Die Reparaturkosten für P244B variieren je nach Grundursache und Fahrzeug. Hier sind typische Schätzungen:

P244B bei bestimmten Fahrzeugen

P244B verhält sich je nach Fahrzeug unterschiedlich. Wählen Sie unten Ihr Auto aus, um modellspezifische Ursachen, bekannte Probleme und angepasste Kostenschätzungen zu sehen:

Verwandte Fehlercodes

Diese Codes treten häufig zusammen mit P244B auf oder weisen auf verwandte Probleme hin:

Häufige Fragen zu P244B

Unsere ausführlichen Anleitungen lesen