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Home / DTC / P1472 — DPF differential PRS.sensor low

P1472 — DPF differential PRS.sensor low

Detailed page for trouble code P1472.

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P1472

MITSUBISHI P — Powertrain

DPF differential PRS.sensor low

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
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Page language: EN

Causes

  • Failed/shorted differential pressure sensor
  • Damaged, disconnected or collapsed pressure hoses/tubes (upstream or downstream)
  • Corroded or loose electrical connector at the sensor
  • Wiring short to ground or open circuit in sensor harness
  • Exhaust leak near the sensor pressure taps or DPF
  • ECM internal fault (rare)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Limited/regeneration inhibited or forced regen behavior
  • Reduced engine performance or limp mode on some models
  • Increased fuel consumption and/or smoke during driving
  • Failed emissions inspection

What to check

  • Scan for stored and pending codes; record freeze-frame and live data for differential pressure sensor
  • Visually inspect sensor, connector and pressure hoses for damage, crushing, disconnection or soot ingress
  • Back-probe sensor connector to measure supply voltage (reference ~5 V), ground continuity and sensor output voltage
  • Compare sensor output to live differential pressure (kPa or mbar) at idle and under load; watch for changes during throttle application or forced regen
  • Perform smoke test or visual check for exhaust leaks near sensor ports and DPF
  • Check continuity and resistance of wiring harness; wiggle test for intermittent faults

Signal parameters

  • Sensor supply (reference) typically ~5 V from ECM (verify model-specific value)
  • Sensor ground should be near 0 V with good continuity
  • Sensor output voltage generally varies within ~0.2–4.8 V depending on differential pressure (model-dependent)
  • At low/no DPF restriction typical idle differential pressure is near 0–10 mbar (0–1 kPa); higher under load or during regeneration — refer to OEM specs

Diagnostic algorithm

  1. Read and record DTC and live data. Note sensor output voltage and reported differential pressure.
  2. Visually inspect sensor, connector and hoses for obvious damage, soot or disconnection. Repair or replace damaged hoses.
  3. With ignition ON, back-probe connector: confirm reference voltage from ECM and a solid ground. If reference is missing or low, trace wiring to ECM.
  4. Probe sensor output while inducing a known pressure differential (apply gentle vacuum/pressure to hose per service manual) and confirm output changes smoothly. If output is constant low, suspect sensor or wiring short to ground.
  5. Check for exhaust leaks at the pressure tap points and DPF mounting; repair leaks and retest.
  6. If wiring, connectors and exhaust integrity are good but output remains incorrect, replace the differential pressure sensor and clear codes.
  7. After repairs, perform road test and monitor live data; ensure code does not return and DPF monitoring behaves normally.
  8. If problem persists after sensor replacement, inspect ECM inputs/grounds and consider ECU diagnosis by a specialist.

Likely causes

  • Sensor output shorted to ground (low voltage reading)
  • Physical damage or restriction in the sensor pressure lines causing equalized/low differential pressure
  • Connector corrosion or poor pin contact reducing supply voltage
  • Exhaust leak allowing pressures to equalize across DPF
  • DPF removed or bypassed, preventing normal differential pressure

Fault status

⚠️ Status
DPF differential pressure sensor circuit — LOW. ECM detected sensor output below expected threshold or below allowable range for the monitored condition. May inhibit or alter regeneration strategy.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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