P247E

Code

Generic P — Powertrain

Exhaust Gas Temperature Out of Range Bank 2 Sensor 3

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 30 RU: 21

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Page language: EN

Causes

Failed or degraded EGT sensor (thermocouple or temperature sensor)
Open, short, high resistance or intermittent wiring/connectors to sensor
Contaminated sensor tip (soot, oil, coolant, urea deposits)
Exhaust leak near sensor or between sensors
Aftertreatment (DPF, DOC, SCR) damage or plugging changing temperatures
ECM software or internal fault

Symptoms

MIL (check engine) illuminated
Possible reduced aftertreatment performance or regen issues
Unexpected EGT readings on scan tool (very low, very high or erratic)
Possible limp mode on vehicles with aftertreatment protection
Unusual exhaust odor or visible exhaust leak

What to check

Read freeze frame and full diagnostic trouble code data from the ECM
Scan live EGT data for Bank 2 Sensor 3 and compare to other EGT sensors (Bank 1/Bank 2 upstream/downstream)
Perform a visual inspection of the sensor, connector and harness for damage, corrosion or contamination
Check for exhaust leaks and inspect nearby aftertreatment components (DPF, DOC, SCR)
Backprobe sensor connector; check for proper reference voltage/ground if applicable and for thermocouple mV output
Wiggle test harness/connectors while monitoring live data for intermittent behavior

Signal parameters

Sensor type: thermocouple (mV) or temperature sensor (0–5 V) depending on vehicle
Typical operating range (generic): 200°C to 900°C during normal operation (varies by location and engine load)
Out-of-range triggers: readings far below expected cold/hot ranges (near 0 mV or 0 V) or saturated high readings
Expected behavior: progressive rise in temp with load; downstream sensors normally lower than upstream during normal operation

Diagnostic algorithm

Retrieve freeze-frame and live data; confirm P247E is current/active and note engine conditions when set.
Compare Bank 2 Sensor 3 temp vs Bank 2 Sensor 1/2 and Bank 1 sensors to determine whether reading is isolated.
Visual inspection: check sensor mounting, tip condition (soot/contamination), connector pin condition, and harness routing for heat/chafe.
Check for exhaust leaks upstream or near the sensor that could skew readings.
With ignition ON (engine off) or per manufacturer procedure, backprobe and measure sensor circuit: for thermocouple measure mV while warming; for 0–5 V sensors check reference voltage and signal voltage.
Measure continuity and resistance to detect opens/shorts; inspect grounds. Repair any broken wires or poor grounds.
If wiring and connectors are good, swap or bench-test the suspect sensor if a known-good sensor is available, or replace the sensor and clear codes.
After repair, perform a road test to verify correct operating temps and that the code does not return.
If fault persists with good sensor and wiring, consider ECM/PCM diagnostics or software update per manufacturer guidance.

Likely causes

Sensor element failure (common with high heat and contamination)
Connector corrosion or poor ground
Broken/shorted harness from heat, chafing or rodent damage
Soot or urea contamination coating sensor tip
Exhaust leak upstream or downstream altering measured temp

Fault status

⚠️ Status

Exhaust Gas Temperature Out of Range — Bank 2 Sensor 3. ECM detected sensor output outside expected parameters (open/short, implausible voltage/mV, or temperatures beyond calibration limits).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.8-2.5 hours