P244B

Particulate Filter Differential Pressure Too High Bank 1

Diesel exhaust aftertreatment (DPF) Generic OBD-II Medium

What it means

P244B means the pressure difference across the diesel particulate filter (DPF) on bank 1 is higher than allowed — usually because the filter is clogged with soot, or because the differential-pressure sensor is reading wrong. A loaded DPF often triggers reduced power and forced regenerations. Left unaddressed, the filter can be permanently damaged, so it's worth servicing promptly.

Medium

Can I keep driving? You can usually drive, but the DPF is heavily loaded; expect reduced power or forced regens, and get it serviced before the filter is damaged.

Real-world scan data

Seen in

1,078

scans in the past year

Found in

0.2%

of scans

0.3%

of scans that found faults

Appears alongside · share of P244B scans

P0704in 58.8% of scans

P00BCin 54.5% of scans

P0421in 54.1% 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

Reduced power or limp mode
Check-engine light on (sometimes with a DPF warning light)
Frequent or failed regeneration cycles
Exhaust smell or visible smoke
Slightly reduced fuel economy

Common causes

Most likely first

Soot-clogged DPF from repeated short trips or failed regenerationsLikely
Differential-pressure sensor or its hoses giving a high readingCommon
EGR or turbo fault producing excess sootCommon
Contaminated engine oil or high-sulfur fuel accelerating loadingLess often
Physically damaged or ash-saturated DPFLess often

How to diagnose & fix

Work through it in order

Read the DPF differential-pressure PID with a scan tool and compare to spec.
Inspect the pressure sensor and its hoses for blockage, cracks, or disconnection.
Attempt a forced (service) regeneration if the filter is loaded but serviceable.
Address any upstream soot source — EGR, turbo, or injection faults — first.
Clean or replace the DPF if it's ash-saturated or damaged, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P244B?+

Short trips are usually okay, but a heavily loaded DPF can slip into limp mode and, if ignored, be permanently damaged. Have it serviced soon.

Can I just clear P244B?+

Clearing doesn't unclog the filter. It returns until the DPF is regenerated or cleaned and any soot source is fixed.

Read & clear P244B 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