Diesel Trouble Codes

P2452 — Diesel Particulate Filter Pressure Sensor A Circuit (L5P Duramax)

Diesel Particulate Filter Pressure Sensor A Circuit

Updated September 2, 2026

What it means

The ECM has detected a circuit fault in the DPF differential-pressure sensor A circuit. Generic definition: DPF differential-pressure sensor circuit fault.1

Most likely causes

  1. DPF differential-pressure sensor A electrical fault (open/short, connector corrosion, wiring chafe) — circuit fault for sensor A — P2452 is defined as DPF differential-pressure sensor circuit fault on L5P Duramax.1
  2. DPF differential-pressure sensor A internal failure — Circuit fault code applies to sensor A circuit; sensor internal failure can set circuit fault. Generic definition: DPF differential-pressure sensor circuit fault.1
  3. Wiring/connector issue between ECM and DPF differential-pressure sensor A — Circuit fault indicates electrical issue in sensor A wiring/connector. Generic definition: DPF differential-pressure sensor circuit fault.1

How to diagnose

  1. Verify code P2452 is present and check freeze frame for conditions.
  2. Inspect DPF differential-pressure sensor A connector and wiring for corrosion, damage, or chafe; repair as needed.
  3. Check sensor A reference voltage, signal, and ground at the sensor connector per service information; compare to expected values.
  4. If electrical tests pass, substitute a known-good DPF differential-pressure sensor A and re-evaluate.
  5. Inspect DPF pressure tubes for blockage or damage that could affect sensor readings; note P2452 is circuit fault, not range/performance.
  6. Clear codes and road test to confirm circuit fault does not return.

Parts and tools you may need

Rough cost and difficulty

Parts and labor vary by location and shop; obtain a quote before proceeding.

When to see a pro

If wiring tests are inconclusive or the fault persists after sensor replacement, have a qualified diesel technician diagnose the ECM circuit and DPF pressure sensing system.

Sources

  1. Curated DTC seed — L5P Duramax (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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