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

¿Qué significa 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 es un código de diagnóstico relacionado con emisiones, clasificado con gravedad high. Cuando la ECU de tu vehículo detecta esta condición, almacena P244B y enciende la luz del motor.

¿Cuáles son los síntomas de P244B?

Si tu vehículo ha activado P244B, es posible que notes uno o más de estos síntomas:

• 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)

¿Qué causa P244B?

Estas son las causas más comunes de P244B, ordenadas por probabilidad:

¿Es seguro conducir con P244B?

En general sí, para trayectos cortos. 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.

¿Cómo se diagnostica P244B?

Sigue estos pasos para identificar la causa raíz de 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

¿Cuánto cuesta reparar P244B?

Los costes de reparación de P244B varían según la causa raíz y tu vehículo. Estas son estimaciones típicas:

P244B en vehículos específicos

P244B se comporta de forma diferente según tu vehículo. Selecciona tu coche a continuación para ver causas específicas del modelo, problemas conocidos y estimaciones de costes ajustadas:

Códigos de diagnóstico relacionados

Estos códigos suelen aparecer junto con P244B o indican problemas relacionados:

Preguntas frecuentes sobre P244B

Lee nuestras guías detalladas