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

Co oznacza 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 to diagnostyczny kod usterki związany z emisje, sklasyfikowany jako high ważności. Gdy komputer pokładowy wykryje tę usterkę, zapisuje P244B i zapala kontrolkę silnika.

Jakie są objawy P244B?

Jeśli Twój pojazd wygenerował P244B, możesz zauważyć jeden lub więcej z tych objawów:

• 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)

Co powoduje P244B?

Oto najczęstsze przyczyny P244B, uszeregowane według prawdopodobieństwa:

Czy można jeździć z P244B?

Zasadniczo tak, na krótkie dystanse. 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.

Jak diagnozuje się P244B?

Wykonaj te kroki, aby ustalić przyczynę P244B:

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

Ile kosztuje naprawa P244B?

Koszty naprawy P244B różnią się w zależności od przyczyny i pojazdu. Oto typowe szacunki:

P244B w konkretnych pojazdach

P244B zachowuje się różnie w zależności od pojazdu. Wybierz swój samochód poniżej, aby zobaczyć przyczyny specyficzne dla modelu, znane problemy i skorygowane szacunki kosztów:

Powiązane kody diagnostyczne

Te kody często pojawiają się razem z P244B lub wskazują na powiązane problemy:

Częste pytania o P244B

Przeczytaj nasze szczegółowe poradniki