P2452 — Diesel Particulate Filter Pressure Sensor A Circuit — 6.7 Cummins (SCR / DEF)
P2452 is a generic OBD-II code for a DPF differential-pressure sensor circuit fault on the 6.7L Cummins SCR/DEF platform.
What it means
The ECM is detecting an electrical/circuit fault with DPF differential-pressure Sensor A, not a confirmed DPF restriction. On 6.7 Cummins 2013–present, this code maps to the DPF pressure sensor circuit per the platform definition.1
Most likely causes
- DPF differential-pressure sensor A internal failure or wiring/connector damage (chafing, corrosion, moisture) causing an open/short in the signal/5V/ground circuit. — Inspect sensor connector and harness for corrosion, oil contamination, and chafing along the exhaust/frame route; check 5 V reference and ground at the sensor connector with key-on/engine-off. Compare sensor output to a known-good baseline at idle and during a light load; erratic or fixed voltage indicates sensor or wiring fault.1
- Exhaust leaks or sensor tube blockage/plugging at the DPF pressure tap causing implausible pressure readings that the ECM interprets as a circuit/range fault. — Visually inspect pressure tubes and fittings for cracks, soot plugging, or moisture freeze; blow through tubes to confirm clear passage. Check for exhaust leaks upstream of the DPF that can skew differential pressure readings.1
- ECM connector corrosion or internal ECM driver fault for the pressure sensor circuit. — Inspect ECM harness connector for moisture/corrosion; perform a pin-drag test and check continuity from ECM to sensor. If wiring tests good, compare freeze-frame data and monitor live sensor voltage for rationality before condemning the ECM.1
How to diagnose
- Verify code and freeze-frame conditions; confirm P2452 is present and no other DPF/aftertreatment codes are active.
- Key-on/engine-off: check DPF differential-pressure sensor connector for corrosion/moisture; measure 5 V reference, ground, and signal voltage per service data.
- Inspect pressure tubes and sensor ports for soot plugging, cracks, or exhaust leaks; clear tubes and retest.
- Wiggle-test harness from sensor to ECM while monitoring live data for dropouts; check continuity and isolation of signal/5V/ground circuits.
- If circuit tests normal, compare sensor output at idle and during a controlled load to expected differential pressure; replace sensor if output is stuck/erratic.
- Clear codes, road test with data logging of DPF differential pressure and sensor voltage; confirm code does not reset.
- If fault persists with good wiring and sensor, evaluate ECM connector and internal driver per manufacturer diagnostics.
- Do not perform step-by-step repair of safety-critical systems; refer to OEM service information for component replacement and calibration.
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
- Scan tool with live data for DPF differential pressure and sensor voltage
- Inspection light and mirror
- Compressed air or low-pressure blow gun for tube clearing
- Dielectric grease
- OEM wiring diagrams
Tools you’ll need
- OBD-II scan tool — Reads P2452 and live DPF differential-pressure data to confirm circuit fault versus actual restriction.
- digital multimeter — Checks 5 V reference, ground, and signal voltage at the DPF pressure sensor connector per service data.
- borescope — Inspects DPF pressure tap tubes and sensor ports for soot plugging or cracks without disassembly.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Scan-tool forced (parked) regeneration | — | 0.5–1.5 hrs | DIY with tools and a manual |
| 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 the code returns after circuit verification, or if DPF/aftertreatment derate or limp mode occurs, have a qualified diesel technician diagnose with OEM tools. Do not attempt high-pressure fuel or exhaust system repairs without proper training and safety equipment.
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 '13+
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 (SCR / DEF)? This goes straight to the editor — it is not published.