P2454

Particulate Filter Pressure Sensor A Circuit Low

Q: Is it safe to drive with P2454?

Yes for normal driving — it's a sensor-circuit fault, not a mechanical failure. The catch is the ECM can't monitor DPF pressure properly, which may disrupt regeneration, so fix it before soot builds up.

Q: Can I just clear P2454?

It returns while the circuit reads low. The wiring short or the sensor needs to be repaired.

Diesel particulate filter (DPF) Generic OBD-II Low

What it means

P2454 means the ECM sees low voltage on the "A" diesel particulate filter pressure sensor circuit — the sensor that measures pressure across the DPF. It's an electrical fault, usually a short to ground, a wet or corroded connector, or a failed sensor. The engine runs normally, but the ECM can't monitor DPF loading correctly, which can disrupt regeneration until it's repaired.

Low

Can I keep driving? Yes — the engine runs normally; this is a sensor-circuit fault, though the DPF can't be monitored properly until it's fixed.

Real-world scan data

Seen in

148

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

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
Usually no noticeable change in how the car drives
DPF regeneration/monitoring may be affected
Possible reduced power if the ECM limits regeneration

Common causes

Most likely first

Short to ground in the DPF pressure sensor signal wire (reads low voltage)Likely
Faulty DPF pressure sensorCommon
Corroded or wet connector at the sensorCommon
Damaged wiring near the exhaustLess often
ECM fault (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data to see when the fault set.
Inspect the DPF pressure sensor connector and wiring for a short to ground or damage.
Check the sensor's reference voltage and ground.
Test the sensor's output against the manufacturer's spec.
Replace the sensor if faulty, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2454?+

Yes for normal driving — it's a sensor-circuit fault, not a mechanical failure. The catch is the ECM can't monitor DPF pressure properly, which may disrupt regeneration, so fix it before soot builds up.

Can I just clear P2454?+

It returns while the circuit reads low. The wiring short or the sensor needs to be repaired.

Read & clear P2454 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