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P244A: Diesel particulate filter differential pressure too low (bank 1)

The pressure difference across the diesel particulate filter is lower than normal. A loose sensor hose or a damaged filter is typical.

Code P244A at a glance
CodeP244A
SystemEngine and transmission
GroupP24xx, EGR, EVAP and particulate filter
TypeGeneric: it means the same on every make
Can you keep driving?With care

What P244A means

A sensor compares exhaust pressure before and after the particulate filter to work out how much soot it holds. If the difference is almost zero, the ECU concludes the gases are passing through unhindered, as if the filter were cracked, missing, or the sensor were not measuring correctly.

Most common causes

  • Differential pressure sensor hose loose, split or melted
  • Metal pressure pipe blocked or broken
  • Faulty differential pressure sensor
  • Exhaust leak between the filter and the sensor tappings
  • Particulate filter cracked internally or removed

Symptoms

  • Engine warning light on
  • Possible limp mode
  • Regenerations may not run when due
  • Sometimes black smoke from the exhaust

Can you drive with P244A?

With care You can drive, but have it checked soon: without a reliable reading the ECU cannot manage the filter, and if the filter is damaged the car will not meet emissions limits.

How to check it

With the engine off, check the two small hoses running from the exhaust to the sensor: properly fitted, not cracked and not swapped over. On live data, the differential pressure should rise clearly when you rev the engine.

How to read and clear P244A 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 P244A 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

P244A is a generic code, so it means the same on any make, for example on Abarth, Cupra, Hyundai, Jeep, Mini, Seat. See what Final OBD does on your car in makes and models.

What does code P244A mean?

A sensor compares exhaust pressure before and after the particulate filter to work out how much soot it holds. If the difference is almost zero, the ECU concludes the gases are passing through unhindered, as if the filter were cracked, missing, or the sensor were not measuring correctly.

Can you drive with P244A?

You can drive, but have it checked soon: without a reliable reading the ECU cannot manage the filter, and if the filter is damaged the car will not meet emissions limits.

How do you clear P244A?

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, P244A comes back.