P2454 on the 6.7L Cummins is a diesel particulate filter (DPF) differential pressure sensor A circuit low input fault. The 6.7L uses a pressure sensor across the DPF to measure the difference between the inlet and outlet, which tells the ECM how loaded the filter is with soot and when to run a regeneration. P2454 sets when the ECM reads that sensor's signal too low, indicating a short to ground, an open, or a failed sensor.
The DPF pressure signal is central to regeneration strategy, so a faulty reading can cause missed or improper regens and eventually a clogged filter. P2454 is an electrical circuit code, which points first at the sensor, its wiring, the connector, and the pressure hoses rather than at the DPF substrate. Confirming the circuit and the hoses before replacing the sensor or the filter avoids unnecessary expense.
What P2454 means
The DPF differential pressure sensor outputs a voltage that represents the pressure drop across the filter. P2454 sets when that voltage stays at the low end of the scale, indicating a signal wire shorted to ground, a lost reference, an open circuit, or a sensor that has failed low. The ECM loses accurate soot-load data and cannot manage regeneration correctly.
Common causes
- Signal wire shorted to ground
- Lost reference voltage to the sensor
- Open in the signal or reference circuit
- Corroded or loose sensor connector
- Failed DPF pressure sensor or a disconnected hose
Symptoms
- Check engine light with P2454 stored
- Regeneration problems or a regen warning
- Reduced power or a derate in some cases
- Poor fuel economy over time
- Companion DPF or exhaust pressure codes
How to diagnose it
With a scan tool, view the DPF differential pressure value key on, engine off; it should read near zero pressure. A signal pinned low or implausible confirms the fault. Inspect the sensor connector for corrosion and a secure fit, and back-probe to confirm the reference and ground. Check the signal wire for a short to ground and confirm continuity to the ECM. Inspect the pressure sense hoses for cracks, disconnection, or blockage, since a hose problem can mimic a sensor fault.
How to fix it
Repair a signal wire shorted to ground, restore a lost reference, and clean or replace a corroded connector first. Repair or replace cracked or disconnected pressure hoses. If the reference and ground reach the sensor but the signal stays low, replace the DPF pressure sensor. After the repair, clear the code, confirm the sensor reads near zero at rest and responds under load, and verify regeneration operates. For DPF pressure sensors, hoses, and connectors for your 6.7L Cummins, contact sales@coredieselparts.com.
Frequently asked questions
What is the difference between P2454 and P2455?
P2454 is the DPF pressure sensor circuit reading too low and P2455 is the same circuit reading too high. Both point at the sensor, its wiring, and the pressure hoses.
Can a cracked hose cause P2454?
Yes. The sensor reads pressure through hoses connected across the DPF. A cracked, blocked, or disconnected hose can skew the reading, so inspect the hoses along with the sensor.
Will P2454 clog my DPF?
Over time it can, because the ECM uses this signal to schedule regeneration. If the reading is wrong, regens may be missed and soot can accumulate, so repair it promptly.
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