Particulate Filter Differential Pressure Too Low Bank 1
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.
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.
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?+
Can I just clear P244A?+
Related codes
Often seen with P244A
Read & clear P244A yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.