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Home / DTC / P04E5 — EGR Temperature Sensor D Circuit

P04E5 — EGR Temperature Sensor D Circuit

Detailed page for trouble code P04E5.

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P04E5

Generic P — Powertrain

EGR Temperature Sensor D Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 15 EN: 27 RU: 15
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Page language: EN

Causes

  • Open or short in the EGR temperature sensor D wiring harness
  • Corroded, damaged or disconnected sensor connector
  • Failed EGR temperature sensor (thermistor or thermocouple)
  • Poor ground or reference voltage to sensor
  • Contamination or heat damage to the sensor (soot, oil, exhaust corrosion)
  • PCM/ECM internal fault or poor connector at PCM

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible reduced engine performance or limp mode if PCM limits EGR
  • Poor idle or rough running (depending on control strategy)
  • Reduced fuel economy and higher emissions
  • Failed emissions test
  • Freeze-frame data stored

What to check

  • Visually inspect sensor, wiring harness and connector for damage, corrosion, heat or soot contamination
  • Verify connector is fully seated and locking tab engaged
  • Check for continuity and shorts between sensor signal, sensor ground and vehicle battery positive (VB) or reference circuit
  • Read live data / freeze frame for EGR temp D; verify value is plausible and changes with engine warm-up or by applying heat to sensor
  • Measure sensor resistance (if thermistor) or voltage/millivolt output (if thermocouple) and compare to expected values
  • Wiggle test wiring and connectors while monitoring live data to find intermittent faults

Signal parameters

  • Sensor type varies by manufacturer: either NTC thermistor or thermocouple. Consult OEM spec.
  • Typical NTC thermistor resistance examples (approximate): ~10 kΩ at 25°C; resistance decreases as temperature rises. Exact values vary by sensor
  • Typical thermocouple output (if used): millivolt-level signal that increases with temperature (tens to hundreds of mV at high EGTs). Consult OEM reference.
  • Reference/supply voltage (if applicable): often ~5.0 V reference from PCM; signal voltage commonly 0.1–4.9 V depending on temperature and sensor type
  • Allowable circuit resistance to ground: short to ground < 5 Ω, open circuit infinite — check against OEM limits

Diagnostic algorithm

  1. Retrieve freeze-frame and live data. Note EGR temp D reading at key conditions (cold start, idle, after warm-up).
  2. Perform visual inspection of the EGR temp D sensor, harness and connector for heat damage, soot build-up, corrosion, pin push-out or broken wires. Repair physical damage first.
  3. Clear codes, run engine and observe live data. If code returns immediately, suspect wiring/short or supplier reference fault.
  4. Back-probe sensor connector. With ignition ON (engine OFF), check for reference voltage (often ~5 V) between reference pin and ground if the sensor requires a supply. If no reference, check PCM output and related fuses/relays.
  5. With engine at ambient, measure sensor resistance (for thermistor) between sensor pins and compare to OEM chart. Heat sensor gently (propane torch with caution or heat gun) and watch resistance/voltage change—should move smoothly.
  6. If sensor is thermocouple type, measure millivolt output while heating—voltage should rise predictably with temperature.
  7. Check for short to ground or battery by measuring continuity between signal wire and ground or between signal wire and VB. Repair shorted/open circuits.
  8. Perform wiggle/stress tests on harness and connector while watching live data to find intermittent faults. Repair broken wires or poor crimps.
  9. If wiring and connector correct, replace the EGR temperature sensor and re-test. Use OEM or equivalent sensor.
  10. If problem persists after replacing sensor and repairing harness, test or replace PCM only after confirming all circuit integrity and consulting OEM procedures.

Likely causes

  • Wiring damage at harness near EGR cooler/manifold (vibration/heat rubbing)
  • Connector corrosion or pin/backside contact failure
  • Failed EGR temperature sensor (most common)
  • High-resistance ground or open reference supply
  • Less likely: PCM fault

Fault status

⚠️ Status
Stored when the PCM detects an open, short, or implausible signal from the EGR Temperature Sensor D circuit. The fault may set the MIL and log freeze-frame data; EGR function or emissions control may be limited.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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P04E4 P04E6 P0401 P0115 P0117 P0118
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