Skip to content
Language: EN
Download

P244B: Diesel particulate filter differential pressure too high (bank 1)

The pressure difference across the diesel particulate filter is higher than normal. Usually a heavily sooted filter or a blocked sensor tapping.

Code P244B at a glance
CodeP244B
SystemEngine and transmission
GroupP24xx, EGR, EVAP and particulate filter
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P244B means

A sensor compares exhaust pressure before and after the particulate filter. If the difference is very large, the gases are meeting too much resistance: the filter is heavily loaded with soot or ash, or the sensor is giving a reading that is not real.

Most common causes

  • Filter heavily loaded because regenerations never finish (lots of short trips)
  • Sensor pipe or tapping blocked with soot
  • Faulty differential pressure sensor
  • High ash load in the filter
  • Engine problem producing excess soot: injector, EGR or intake leak

Symptoms

  • Engine or DPF warning light on
  • Loss of power or limp mode
  • Fan running after switch-off or raised idle (regeneration in progress)
  • Higher fuel consumption

Can you drive with P244B?

With care You can drive with care, but get to a garage soon. If left, the filter keeps filling and may reach a point where it can only be regenerated or cleaned by a workshop.

How to check it

Check the differential pressure and estimated soot load on your scanner. If soot is high and the car allows it, a steady 20 to 30 minute motorway run helps a regeneration finish.

How to read and clear P244B with Final OBD

Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P244B with this same explanation and whether it’s confirmed, pending or permanent.

With Free you read this code with its short description for nothing, and clear it if the engine stores it over standard OBD. With Pro you get the full explanation, how the car was running when it was logged (revs, temperature, load) and clearing in every control unit.

Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before the ITV. It’s all in how to read and clear fault codes and in the ITV and OBD.

Similar codes

P244B is a generic code, so it means the same on any make, for example on BMW, Citroën, Ford, Mercedes-Benz, Renault, Volvo. See what Final OBD does on your car in makes and models.

What does code P244B mean?

A sensor compares exhaust pressure before and after the particulate filter. If the difference is very large, the gases are meeting too much resistance: the filter is heavily loaded with soot or ash, or the sensor is giving a reading that is not real.

Can you drive with P244B?

You can drive with care, but get to a garage soon. If left, the filter keeps filling and may reach a point where it can only be regenerated or cleaned by a workshop.

How do you clear P244B?

With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P244B comes back.