Diesel Trouble Codes

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.

Updated September 2, 2026

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

  1. 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
  2. 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
  3. 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

  1. Verify code and freeze-frame conditions; confirm P2452 is present and no other DPF/aftertreatment codes are active.
  2. Key-on/engine-off: check DPF differential-pressure sensor connector for corrosion/moisture; measure 5 V reference, ground, and signal voltage per service data.
  3. Inspect pressure tubes and sensor ports for soot plugging, cracks, or exhaust leaks; clear tubes and retest.
  4. Wiggle-test harness from sensor to ECM while monitoring live data for dropouts; check continuity and isolation of signal/5V/ground circuits.
  5. 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.
  6. Clear codes, road test with data logging of DPF differential pressure and sensor voltage; confirm code does not reset.
  7. If fault persists with good wiring and sensor, evaluate ECM connector and internal driver per manufacturer diagnostics.
  8. Do not perform step-by-step repair of safety-critical systems; refer to OEM service information for component replacement and calibration.

Parts and tools you may need

Rough cost and difficulty

Parts cost varies by model year and supplier; labor varies by shop and access. Obtain quotes before proceeding.

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.

Sources

  1. Curated DTC seed — 6.7 Cummins (SCR / DEF) (curated) ↩︎ ↩︎ ↩︎ ↩︎

Watch a repair

Third-party videos, not ours — for illustration. Confirm anything against the factory service information for your truck.

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