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Home / DTC / P2476 — Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 4

P2476 — Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 4

Detailed page for trouble code P2476.

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P2476

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 4

Brand: Generic
Type: P — Powertrain
Views: UK: 7 EN: 17 RU: 13
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Page language: EN

Causes

  • Faulty EGT sensor (open/short or internal failure)
  • Damaged or shorted wiring harness (heat damage, chafing, melted insulation)
  • Corroded or loose connector or poor pin contact
  • Short to battery voltage (power feed) or other high-voltage source on the sensor circuit
  • Failed sensor heater circuit (if sensor uses a heater) or stuck-on heater
  • Exhaust leak or abnormal exhaust temperatures upstream of the sensor

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced engine performance or limp-in mode during protection
  • Frequent or failed DPF/aftertreatment regens
  • Stored related EGT and aftertreatment trouble codes
  • Possible noticeable exhaust odor or visible damage near sensor area

What to check

  • Read and record all stored trouble codes and freeze-frame data
  • Inspect wiring harness and connector at Bank 2 Sensor 4 for heat damage, melting, chafing or corrosion
  • Check for recent exhaust, turbo, or aftertreatment work that may have disturbed the sensor or harness
  • Visually inspect sensor mounting location for soot, exhaust leaks or physical damage
  • Verify proper sensor part number if recently replaced

Signal parameters

  • Sensor type varies: thermocouple outputs millivolts (mV) proportional to temp; thermistor sensors output voltage via ECU pull-up (typical 0.1–4.9 V range)
  • At ambient: thermocouple ~0 mV to small mV, thermistor-based voltage often around mid-range (varies by design)
  • At operating/regeneration temps: expected large increase in mV for thermocouples or voltage approaching upper range for thermistors (consult vehicle spec)
  • Typical resistance for some EGT thermistors at 20°C: ~1–10 kΩ (manufacturer-specific)
  • Heater circuit (if present): expected resistance typically a few ohms to tens of ohms; supply voltage near battery voltage when active

Diagnostic algorithm

  1. Retrieve freeze frame and live data for EGT Bank 2 Sensor 4. Note reported temperature/voltage and compare to other EGT sensors.
  2. Check for related codes (other EGT sensors, heater circuits, exhaust leaks, DPF codes) to help localize problem.
  3. Perform a thorough visual inspection of the sensor, connector and harness routing from the sensor to the ECM. Look for heat damage, melted insulation, pin corrosion, or recent repair/connector work.
  4. With ignition ON (engine off), back-probe the sensor connector and measure signal voltage and reference/ground circuits. Compare to expected ranges in vehicle service data.
  5. If sensor uses a thermocouple, measure mV output while warming sensor (careful—exhaust is hot) or during a controlled heat application and verify the mV response increases; for thermistor types measure resistance vs. temperature if possible.
  6. Inspect/check heater circuit (if equipped): measure heater resistance and check for supply voltage when heater commanded on (use live data to command heater).
  7. Wiggle test the harness while monitoring live data to identify intermittent opens/shorts.
  8. If wiring or connector abnormality found, repair or replace damaged wiring/connector and retest before replacing sensor.
  9. If wiring and connectors test good, replace the EGT sensor with correct OEM/approved part and clear codes.
  10. After repair, run warm-up and drive cycles or forced DPF regen as required and verify code does not return and monitor live EGT values.
  11. Safety note: exhaust components and EGT sensors can be extremely hot. Use protective gloves and tools, and allow components to cool before performing hands-on work.

Likely causes

  • Connector or wiring insulation damaged by heat near the sensor
  • Sensor element failed and producing high voltage/temperature output
  • Short to battery voltage in the sensor harness plug
  • Sensor installed in wrong location or incorrect replacement sensor
  • Aftertreatment issues (DPF regeneration) causing extreme local temps

Fault status

⚠️ Status
P2476 — Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 4): The ECM detected a higher-than-expected voltage/temperature signal or a circuit high condition from the EGT sensor on bank 2, sensor 4 circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

P2477 P2475 P2474 P0420 P2002
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