P2454
Particulate Filter Pressure Sensor A Circuit Low
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.
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.
Related codes
Often seen with P2454
Read & clear P2454 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