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Home / DTC / P1427 — DPF temperature sensor low

P1427 — DPF temperature sensor low

Detailed page for trouble code P1427.

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P1427

MITSUBISHI P — Powertrain

DPF temperature sensor low

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty DPF temperature sensor (open, short or drift)
  • Damaged wiring harness or connector (open, short to ground)
  • Corroded or contaminated connector pins
  • Poor sensor grounding or lost reference voltage
  • Intermittent contact from heat cycling or vibration
  • Incorrect sensor installation or wrong replacement part

Symptoms

  • Malfunction Indicator Lamp (MIL) / check engine light illuminated
  • Stored P1427 trouble code (may be accompanied by other DPF codes)
  • DPF regeneration inhibited or failed
  • Reduced engine power or limp mode in some vehicles
  • Frequent or stuck regen requests, poor fuel economy
  • Unusual exhaust smoke during driving or failed emissions test

What to check

  • Read and record freeze-frame and live data for DPF temperature(s) with a scan tool
  • Check for additional stored codes (DPF pressure, DPF efficiency, injector, or ECM codes)
  • Visually inspect sensor, wiring and connector for heat damage, chafing, burns, corrosion or oil contamination
  • Confirm sensor connector is fully seated and locking tab intact
  • Backprobing: verify reference voltage (if used), signal voltage, and sensor ground at the connector with ignition ON/engine running as appropriate
  • Measure sensor resistance with sensor disconnected (cold) and compare to manufacturer spec; verify change when heated (heat gun) to confirm thermistor behavior

Signal parameters

  • Type: typically thermistor (NTC) or temperature sender — resistance decreases as exhaust temperature rises
  • Connector supply: often referenced to ECU (may use pull-up to 5V) or direct resistance to ground depending on design
  • Typical ranges (varies by manufacturer): open circuit = infinite Ω; short = ~0 Ω. Expected cold resistance and voltage vary by sensor — consult OEM spec
  • Live data: sensor voltage usually within 0–5 V or temperature in °C/°F reported by scan tool; sensor should change smoothly as temperature rises

Diagnostic algorithm

  1. Retrieve codes and live data: record freeze-frame, related DPF codes, and monitor DPF temps (pre/post DPF) while key on and during warm-up.
  2. Visual inspection: with engine cold, inspect sensor, harness and connector for heat damage, corrosion, melted insulation, or loose pins. Repair any obvious damage.
  3. Connector and power checks: backprobe the sensor connector. Verify reference voltage (if present), signal voltage, and good ground. Repair wiring issues first.
  4. Sensor resistance test: disconnect sensor and measure resistance at sensor pins at ambient temperature. Heat the sensor slowly (heat gun) and observe resistance/voltage change to confirm thermistor response. Replace if no expected change or out-of-spec.
  5. Wiring continuity: if sensor tests ok, check continuity from sensor connector to ECU pins and check for shorts to ground or battery. Repair faults and recheck.
  6. Re-test with scan tool: clear codes, perform a key-on/engine run test and attempt a forced regeneration if safe. Monitor DPF temps to confirm proper sensor response.
  7. If wiring and sensor pass but code returns, consider ECU input diagnostic or replace ECU as last resort after confirming other components.
  8. After repair, perform test drive and regeneration cycle to verify code does not return and DPF function is normal. Document repairs and parts replaced.

Likely causes

  • Failed/aging thermistor temperature sensor
  • Wiring damage or connector corrosion at sensor or ECU
  • Open or short in sensor circuit due to heat damage
  • Contaminated connector preventing correct signal

Fault status

⚠️ Status
P1427 – DPF temperature sensor circuit low input. ECM detects temperature/signal lower than expected from DPF temperature sensor; may inhibit regeneration.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

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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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