P245F
Particulate Filter Pressure Sensor B Circuit Range/Performance
Diesel particulate filter (emissions)
Generic OBD-II
Medium
What it means
P245F means the diesel particulate filter (DPF) pressure sensor 'B' is reporting a value that's outside its expected range. This sensor measures the pressure drop across the DPF to judge how clogged it is, so a bad reading can cause missed regenerations. It's usually a sensor, hose, or wiring fault rather than a mechanical engine problem.
Medium
Can I keep driving? Usually drivable short-term, but the diesel particulate filter can't be monitored correctly, so regeneration may be skipped and the DPF can clog if it's ignored.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced power or a limp-mode restriction on some vehicles
- Failed or interrupted DPF regeneration cycles
- Possible extra smoke or a DPF/exhaust warning light
Common causes
Most likely first
- Faulty diesel particulate filter (DPF) differential pressure sensor 'B'Likely
- Clogged, cracked, or disconnected pressure sensor sampling hoses/tubesCommon
- Open, shorted, or chafed wiring in the sensor circuitCommon
- Corroded or loose sensor connectorLess often
- A partially blocked or damaged DPF skewing the pressure readingLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the DPF pressure sensor, its hoses, and connector for damage, soot blockage, or looseness.
- Compare the sensor's live pressure reading against expected values with a scan tool.
- Check wiring continuity and the 5-volt reference/ground at the sensor connector.
- Replace the pressure sensor if its signal is out of range with good wiring.
- If the sensor and wiring are good, inspect the DPF itself for blockage or damage, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P245F?+
For short trips, usually yes, but the DPF can't be monitored properly. Get it checked soon so regeneration isn't skipped and the filter doesn't clog.
Can I just clear P245F?+
It will come back until the sensor, hoses, or wiring are repaired. Clearing alone doesn't fix a range/performance fault.
Related codes
Often seen with P245F
Read & clear P245F 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