P2466

Code

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 3

Brand: Generic

Type: P — Powertrain

Views: UK: 17 EN: 30 RU: 18

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Page language: EN

Check Engine Light (MIL) illuminated
Reduced engine performance or derate on some systems (if ECM limits operation)
Difficult to complete emissions readiness or forced regen issues on diesel systems
Possible unusual exhaust smells or visible soot near sensor location
Intermittent faults that may clear when harness is moved

Read freeze frame and PID data with a scan tool; note EGT values and how they change with engine load
Inspect sensor wiring and connector for heat damage, corrosion, breaks or pin deformation
Backprobe connector and monitor real-time sensor voltage or temperature PID while warming engine under load
Wiggle harness and connectors while monitoring for intermittent changes or returning fault
Check for shorts: measure resistance from sensor signal to battery positive and to ground with ignition off
Inspect exhaust near sensor for leaks, cracks, or soot that may indicate contamination

General: EGT sensors use either thermocouple (mV) or resistive/voltage outputs; most PCM interfaces expect a signal within 0–5.0 V or a millivolt thermocouple range.
Typical behavior: low voltage/mV at ambient, increasing steadily with exhaust temperature; signal must change smoothly with load/temperature.
Example ranges (varies by vehicle): cold idle ~0.1–1.0 V (or a few mV for thermocouples); high load/exhaust temps >2.0–3.0 V (or tens of mV for thermocouples).
Resistance-only sensors: expect a measurable resistance at ambient that decreases/increases with temperature — consult OEM spec for exact ohms at 25°C.
If reading is stuck at open-circuit (infinite resistance) or shorted to battery/ground, circuit fault is present.

Obtain and record freeze-frame and live EGT data with a scan tool. Note when the code set and whether it is active or stored.
Perform a visual inspection of Bank 2 Sensor 3, its connector, and the harness back to the PCM. Repair obvious damage.
With ignition OFF, disconnect the sensor and measure resistance (if applicable) across the sensor terminals and to ground; compare to OEM spec where available.
With backprobe and engine cold, start engine and monitor sensor voltage or mV output while warming and applying load. Confirm signal changes smoothly.
Check for short to battery or ground: with ignition ON (engine OFF) measure voltage on the signal wire and check for unexpected constant battery voltage or ground.
Wiggle the harness and connectors while monitoring live data to detect intermittent faults.
If wiring and connectors test good, apply a controlled heat source (or run engine to heat exhaust) and watch sensor response; lack of response indicates a bad sensor.
Repair any damaged wiring or connectors; replace sensor if out-of-spec or physically damaged.
After repair, clear codes and verify the fault does not return by road testing under conditions that previously triggered the code.
If fault persists and wiring/connector/sensor checks good, consider PCM/ECM diagnostics as last step with OEM-level procedures.

⚠️ Status

ECM detected abnormal/external signal from Exhaust Gas Temperature Sensor Circuit — Bank 2 Sensor 3 (open, short, out-of-range, or intermittent).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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