P2452 — Diesel Particulate Filter Pressure Sensor A Circuit — 6.7 Cummins (EGR + DPF, pre-SCR)
P2452 is a DPF differential-pressure sensor circuit fault on the 6.7L Cummins 2007.5–2012 (EGR+DPF, pre-SCR).
What it means
The ECM has detected an electrical/circuit fault in the DPF differential-pressure sensor A circuit. Generic definition is DPF differential-pressure sensor circuit fault. Typical on this platform: 6.7L Cummins 2007.5–2012 (EGR+DPF, pre-SCR).1
Most likely causes
- DPF differential-pressure sensor A electrical fault / open or short in sensor signal/return/5V supply — Circuit fault for the DPF differential-pressure sensor A. Generic definition: DPF differential-pressure sensor circuit fault.1
- Wiring/connector damage to DPF differential-pressure sensor A harness — Chafing, corrosion or loose connection at the sensor or ECM side can set a circuit fault.1
- DPF differential-pressure sensor A internal failure — Sensor out of range or internal electrical failure triggers circuit code.1
How to diagnose
- Verify code P2452 is present and check freeze-frame for conditions.
- Inspect DPF differential-pressure sensor A connector and wiring for damage, corrosion, oil contamination; repair as needed.
- Check sensor supply voltage, ground and signal circuit continuity to ECM per service info; look for opens/shorts.
- If wiring is intact, test/replace DPF differential-pressure sensor A and re-evaluate.
- After repair, clear codes and confirm no return of P2452 during a drive cycle with DPF pressure monitoring active.
Common mistake to avoid
Cleaning or replacing the DPF before checking its pressure sensor and tubes. Cracked, melted, plugged or wet sensor tubes, or a failing sensor, can set DPF codes while the filter itself is fine. They are cheap to check; clear and verify them before touching the filter. Source: FleetRabbit — P2002 DPF efficiency code causes and fixes.
Parts and tools you may need
- Digital multimeter
- Wiring diagram
- DPF differential-pressure sensor A
- Dielectric grease
- Basic hand tools
Tools you’ll need
- digital multimeter — Checks sensor supply voltage, ground continuity, and signal circuit integrity to confirm opens/shorts per service info.
- OBD-II scan tool — Reads P2452, freeze-frame data, and verifies code clearance after repair during a drive cycle.
- wiring repair kit — Repairs damaged/corroded DPF differential-pressure sensor A harness and connector issues found during inspection.
- vacuum/pressure hand pump with gauge — Tests DPF differential-pressure sensor A response to applied pressure to identify internal sensor failure.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Shop diagnosis | — | 1–2 hrs | Shop |
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| DPF differential pressure sensor | $80–$300 | 0.5–1.5 hrs | Easy DIY |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If wiring faults are found in the engine bay harness or ECM connector, or if code returns after sensor replacement, have a qualified diesel technician perform pinpoint circuit tests to avoid misdiagnosis.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P2452 on the 6.7 Cummins '07.5–'12
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a 6.7 Cummins (EGR + DPF, pre-SCR)? This goes straight to the editor — it is not published.