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Work OrdersWO-2026-04471Repair Intelligence Assistant

Repair Intelligence Assistant

Asset T-4471 · Bay 4 · Diagnosis in progress

Updated 12s ago

AI Repair Intelligence

Axl v4.2

Trained on 4.2M heavy-duty repair events • Refreshed 2 min ago

92%
Most Likely Root CauseHigh Confidence

Failed DPF Differential Pressure Sensor + Soot Loading

Pattern matches 1,247 Cascadia / DD15 cases. Outlet pressure SPN 3251 + low SCR conversion in this sequence is 92% sensor-driven, not a clogged filter. Two failed regens confirm sensor reporting, not actual restriction.

Repair Path
Sensor → Regen → Verify
Est. Downtime
3.5 hrs
Parts Ready
3 of 3 in stock
Recommended Parts
  • A0091533228DD15 DPF Diff Pressure Sensor
    In stock — Bay 2
  • A6800900003Sensor Harness Clip Kit
    In stock
  • DEF-2.5GDEF Top-off (2.5 gal)
    In stock

Most Successful Historical Repairs

Ranked by outcome across similar Cascadia / DD15 cases

4 candidates
#Repair ActionSuccessAvg HrsComebackParts
1Replace DPF differential pressure sensor
94%
2.1 hLowA0091533228, Harness clip
2Forced parked regen + sensor recalibration
71%
1.4 hMediumDEF top-off
3Replace DPF assembly (clean & gasket)
88%
6.8 hLowA6804900092, Gasket kit, V-band clamps
4SCR catalyst replacement
67%
9.2 hHighA6804902214, DEF doser

Repair Decision Tree

AI-generated branching diagnostic path

Live
SPN 3251 detected
Read sensor resistance
> 8 kΩ?
Replace sensor
No → Parked regen
Delta > 8 kPa?
Clean DPF
No → Check SCR
Conv < 80%?
Catalyst service

Diagnostic Steps

  1. 1Connect DiagnosticLink and pull DD15 ECM snapshot — capture freeze frame for SPN 3251.
  2. 2Inspect DPF differential pressure sensor harness at frame rail crossover — known chafe point.
  3. 3Verify sensor resistance: should read 4.5–5.0 kΩ cold. Above 8 kΩ confirms failure.
  4. 4If sensor reads good, perform parked regen and monitor delta pressure live PID.

Suggested Inspections

  • Check sensor tubes for moisture / soot blockage (blow back with 30 PSI).
  • Verify DEF dosing pressure ≥ 70 PSI before condemning SCR.
  • Confirm no exhaust leaks upstream of DPF — false high reading source.

Warnings

  • Do NOT replace DPF assembly until sensor is ruled out — 23% comeback rate when skipped.
  • Active 5 MPH derate — do not road-test until cleared.

Known Failure Patterns

  • Cascadia 2022–2024 DD15: sensor failures cluster at 425k–510k mi.
  • Laredo terminal trucks show 1.4× sensor failure rate (heat + dust).