P244A

Particulate Filter Differential Pressure Too Low Bank 1

Diesel particulate filter (DPF) Generic OBD-II Medium

What it means

P244A means the pressure difference measured across the Bank 1 diesel particulate filter is lower than expected. Rather than a clogged filter, a too-low reading usually points to a leaking or disconnected sensor hose, a faulty differential-pressure sensor, or a cracked DPF that no longer holds back-pressure. The car often drives normally, but the fault should be fixed so the DPF is monitored and regenerated correctly.

Medium

Can I keep driving? Usually yes — the car drives normally, but a too-low reading can mean a leaking sensor hose or a cracked filter, so get it checked to keep the DPF working.

Real-world scan data

Seen in

623

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P244A scans

P244Bin 59.9% of scans

P0401in 45.4% of scans

P0704in 44.9% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Often no noticeable change in how the car drives
Possible reduced power or abnormal regeneration behaviour

Common causes

Most likely first

Leaking or disconnected DPF differential-pressure sensor hoseLikely
Faulty differential-pressure sensor reading lowCommon
Cracked or damaged DPF substrate (loss of back-pressure)Common
Blocked or kinked reference hoseLess often
ECM fault (rare)Less often

How to diagnose & fix

Work through it in order

Inspect both differential-pressure sensor hoses for leaks, cracks, or disconnection.
Check the sensor ports for soot blockage.
Test the differential-pressure sensor against the manufacturer's spec.
Inspect the DPF for cracks or internal damage.
Replace the hose, sensor, or DPF as indicated, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P244A?+

Usually yes — the car generally drives normally. But a too-low differential reading can mean a leaking sensor hose or a cracked filter, so get it checked so the DPF and its regeneration keep working properly.

Can I just clear P244A?+

It returns until the hose leak, sensor, or filter fault is repaired, since the ECM keeps monitoring the pressure across the DPF.

Read & clear P244A yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX