P247D

Code

Generic P — Powertrain

Exhaust Gas Temperature Out of Range Bank 2 Sensor 2

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 41 RU: 28

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Page language: EN

Causes

Failed or degraded Bank 2 Sensor 2 (EGT downstream)
Open, shorted or corroded wiring or connector to the EGT sensor
Failed heater element or supply (on vehicles with heated EGT sensors)
Exhaust leak or restriction downstream of the sensor
Catalyst/DPF damage or plugging causing abnormal temperatures
PCM or sensor circuit fault (rare)

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
Reduced engine power or limp-home mode on some vehicles
Poor fuel economy or increased emissions
Unusual exhaust odors or visible smoke (if aftertreatment damaged)
Stored freeze-frame data showing abnormal EGT values

What to check

Read and record freeze-frame and live data for all EGT sensors (Bank 2 Sensor 2 and upstream Bank 2 Sensor 1)
Compare Bank 2 Sensor 2 readings to Bank 1 Sensor 2 and the upstream sensor on the same bank under similar conditions
Inspect sensor connector and wiring for corrosion, damage, pin push-out, or melted insulation
Check for TSBs or previous repairs affecting the exhaust/aftertreatment system
Perform a visual inspection of the exhaust downstream of the sensor for damage, leaks, restrictions, or signs of overheating
Verify no related codes (DPF, catalyst, turbo, sensors) that could explain abnormal exhaust temps

Signal parameters

Normal behavior: EGT voltage/temperature should rise with load and drop at idle or steady cruise
Typical downstream (Sensor 2) temps are lower than upstream (Sensor 1) under normal operation — expect a noticeable delta (vehicle dependent, commonly tens to a few hundred °C)
Fault indicators: open circuit (very low/no temp reading), short/over-range (stuck at high temp or pegged), or no heater supply/ground (if equipped)
Heater circuit (if present): key-on voltage supply to heater (approx. battery voltage) and controlled ground from PCM; heater current typically within manufacturer spec (often

Diagnostic algorithm

Connect a scan tool. Record freeze-frame and live EGT readings for Bank 2 Sensor 2 and related sensors. Note operating conditions when code set.
Visually inspect the sensor and harness. Repair corroded or damaged connector pins and check for chafing or repairs upstream that could affect the circuit.
With ignition ON (engine off), verify power and ground to the sensor heater circuit (if equipped) and backprobe the signal lead to verify it is not open to the PCM. Compare to manufacturer wiring diagram.
With engine running, monitor live EGT temperature/voltage while varying load (idle, idle to part throttle, moderate acceleration). The downstream sensor should change and generally remain lower than the upstream sensor. No change or pegged values indicate sensor or wiring fault.
Perform a resistance/continuity check of the sensor and heater (if possible) disconnected from the harness and compare to manufacturer specs. If specs are unavailable, verify response to heat: apply a controlled heat source (heat gun) to the sensor tip while watching live data — temperature/signal should rise smoothly. Use caution and protect surrounding components.
If wiring and connector checks are good but the sensor behaves incorrectly, replace Bank 2 Sensor 2. Clear codes and perform a road test under varied load to confirm the code does not return.
If new sensor immediately reports abnormal values, check for exhaust restrictions, damaged catalyst or DPF causing extreme temps and inspect upstream systems (injectors, turbo, EGR) that affect exhaust temperature.
If wiring harness shows intermittent faults, perform backprobe or wiggle test to reproduce. Repair splices or harness and retest. If all electrical paths check and the new sensor still fails, consider PCM or module failure as last resort and verify with manufacturer procedures.

Likely causes

Damaged or corroded sensor connector or pin(s)
Open or short in the sensor signal or heater circuit
Sensor failed due to age or contamination from oil/soot
High exhaust temperatures from a plugged DPF or failing turbo leading to sensor over-range

Fault status

⚠️ Status

The PCM detected the Bank 2 Sensor 2 EGT signal outside programmed thresholds (too low, too high, open, short, or no heater control) during monitoring and set MIL. Freeze-frame stores the operating conditions when the fault occurred.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours