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.

Real-world scan data

Seen in

715

scans in the past year

Found in

0.1%

of scans

0.2%

of scans that found faults

Appears alongside · share of P2455 scans

P242Fin 34.3% of scans

P0101in 24.9% of scans

P0100in 11.6% 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

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.

Read & clear P2455 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