P2455
Particulate Filter Pressure Sensor A Circuit High
Diesel exhaust aftertreatment (DPF)
Generic OBD-II
Medium
What it means
P2455 means the diesel particulate filter (DPF) pressure sensor 'A' circuit is reading higher than expected — typically a short to voltage, an open circuit, or plugged/disconnected sensor hoses. This sensor tells the ECM how loaded the DPF is, so a bad signal can disrupt regeneration. The engine often runs normally, but the circuit should be fixed so the filter doesn't overload unnoticed.
Medium
Can I keep driving? Usually drivable, but the DPF regen logic relies on this sensor; get it checked so the filter doesn't overload while the reading is wrong.
Common symptoms
What you'll notice
- Check-engine light on
- Disabled or abnormal DPF regeneration cycles
- Possible reduced power if the ECM defaults to a safe mode
- Often no obvious change in how the engine runs
Common causes
Most likely first
- Short to voltage or open in the DPF pressure sensor signal circuitLikely
- Disconnected, cracked, or plugged pressure sensor hosesCommon
- Corroded or loose sensor connectorCommon
- Failed DPF differential-pressure sensorLess often
- Damaged wiring between the ECM and the sensorLess often
How to diagnose & fix
Work through it in order
- Read the DPF pressure sensor signal voltage and compare with spec.
- Inspect the sensor's pressure hoses for cracks, disconnection, or soot blockage.
- Check the sensor connector and signal wire for a short to voltage or an open.
- Test the sensor and replace it if the reading stays out of range.
- Repair damaged wiring, then clear the code and confirm normal readings.
FAQ
Quick answers
Is it safe to drive with P2455?+
Usually yes, but with the sensor reading wrong the ECM may skip regenerations and let the DPF overload. Have it diagnosed before long or heavy drives.
Can I just clear P2455?+
It returns until the sensor, its hoses, or the wiring is repaired. Clear it after the fix to confirm the circuit reads correctly.
Related codes
Often seen with P2455
Read & clear P2455 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