P2084 indicates that the exhaust gas temperature (EGT) sensor circuit on bank 1, sensor 2 is reporting a signal outside the expected range or performance limits. The engine control module monitors the sensor voltage or resistance and expects it to vary with exhaust temperature; a signal that is too high, too low, or static triggers this code.
The sensor’s thermistor or thermocouple can degrade, producing an out‑of‑range resistance or voltage.
Open circuits, shorted wires, corroded pins, or damaged insulation interrupt the sensor signal.
A leak allows ambient air to cool the sensor, causing a temperature reading that does not match actual exhaust conditions.
Soot, oil, or coolant deposits on the sensor tip alter its thermal response.
Internal driver or processing error is rare; only considered after sensor and wiring are verified good.
No. PCM failure is extremely rare for this code; the fault is almost always the sensor, wiring, or an exhaust leak.
Yes. Soot, oil, or coolant on the sensor tip can skew the temperature reading and trigger P2084.
Only if the fault was intermittent; otherwise the code will return once the condition reoccurs.
Short‑term driving may be acceptable, but prolonged operation can degrade catalyst efficiency and increase emissions.