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Home / DTC / P1499 — DPF high temperature

P1499 — DPF high temperature

Detailed page for trouble code P1499.

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P1499

MITSUBISHI P — Powertrain

DPF high temperature

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 20 EN: 25 RU: 25
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Page language: EN

Causes

  • Clogged or damaged DPF creating hotspots
  • Faulty exhaust gas/DPF temperature sensor (open, short or out-of-spec)
  • Wiring/connectors damaged, corroded or shorted to sensor
  • Excessive fueling (overfuelling) or injector(s) leaking causing very hot combustion
  • Failed turbocharger (wastegate/stuck, oil seal failure) producing excessive exhaust heat
  • EGR stuck/blocked or malfunctioning causing high combustion temperatures

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible reduced engine power / limp mode
  • Frequent or prolonged active DPF regenerations
  • Strong exhaust heat, burning smell or visible smoke during/after regenerations
  • Elevated engine or exhaust temperature readings in scan tool data
  • Possible increased fuel consumption or rough running if injectors/turbo affected

What to check

  • Read all stored codes and freeze-frame data with a scan tool; note conditions when code set
  • Monitor live data: upstream and downstream DPF temperature sensors, compare both and observe changes during idle, load and regen
  • Check for related codes (injectors, turbo, EGR, pressure sensors)
  • Visually inspect DPF and nearby exhaust for signs of overheating, cracking, glowing or soot accumulation
  • Inspect sensor connectors and wiring for corrosion, chafing, broken wires or water ingress; measure sensor resistances/voltages per service data
  • Check differential pressure across DPF (soot load) with a smoke/pressure gauge

Signal parameters

  • Upstream DPF/exhaust temp sensor typical idle ranges: ~100–400 °C (varies by engine and test conditions)
  • Temperatures during active regeneration commonly 500–700 °C (manufacturer-dependent)
  • Typical trigger threshold for DPF high-temp warnings often above ~650–900 °C (refer to factory spec for exact threshold)
  • Sensor circuit resistance/voltage: compare measured values to manufacturer service specifications
  • Delta between upstream and downstream temps: large unexpected spikes upstream indicate a problem at/near the DPF

Diagnostic algorithm

  1. Capture freeze-frame and live data to confirm when the high temperature event occurred and under what operating conditions (load, speed, regen).
  2. Inspect sensor connectors and wiring for open/shorts; perform continuity and resistance checks on temperature sensors per service manual. Replace or repair wiring as required.
  3. Compare upstream and downstream temperature sensor readings. If both move logically and agree, overheating is likely; if only one sensor reads high, suspect that sensor or its circuit.
  4. Check DPF backpressure/differential pressure to assess soot loading. If high, consider cleaning or replacement of DPF after resolving root cause.
  5. Inspect for exhaust leaks or damage upstream of sensors and DPF that could affect sensor readings or cause hotspots.
  6. Check fuel system (injectors, fuel pressure) and turbocharger/EGR operation for conditions that cause excessive exhaust temperatures; repair as necessary.
  7. If sensors and wiring verify OK but temps are legitimately high, perform controlled drive/forced regeneration monitoring to observe temperature behavior and confirm DPF integrity (use caution — high temps present fire/burn risk).
  8. Repair or replace failed components (sensor, wiring, injectors, turbo, EGR, DPF) based on findings. Clear codes and re-test to confirm the fault does not return.
  9. Safety note: exhaust system and DPF can be extremely hot. Allow cooldown and use proper PPE. Avoid forced regenerations in enclosed or unsafe environments.

Likely causes

  • DPF heavily restricted or damaged producing localized high temperatures
  • Faulty upstream/downstream exhaust temperature sensor or harness fault
  • Sustained forced regeneration or repeated regenerations due to oil/soot loading (e.g., bad injectors)
  • Turbocharger or EGR malfunction increasing exhaust gas temperature

Fault status

⚠️ Status
ECM detected exhaust/DPF temperature above allowable threshold. MIL set; system may inhibit normal operation or force protective strategies (e.g., restrict fuel or enter limp mode).
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

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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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