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.
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.
Related codes
Often seen with P244B
Read & clear P244B yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX