P2489 indicates that the exhaust gas temperature (EGT) sensor circuit on bank 2, sensor 5 is sending intermittent or erratic signals to the PCM. This can affect emissions control and engine performance. The code is triggered when the PCM detects irregular voltage or resistance from the sensor.
The sensor can develop internal faults that cause intermittent signal loss or out‑of‑range voltage, triggering the code.
Corroded, broken, or loose wiring and connectors at the sensor or PCM side can interrupt the signal intermittently.
Leakage can alter the exhaust temperature sensed by the sensor, leading to irregular readings.
A rare internal fault in the PCM's sensor circuit can cause intermittent errors, but this is uncommon compared to sensor or wiring issues.
No. The code is most often caused by a faulty sensor, wiring, or connector; PCM replacement is rarely needed and should only be considered after other causes are ruled out.
No. EGT sensors measure exhaust temperature directly and are distinct from oxygen sensors, which monitor oxygen content.
Driving with the code is generally safe for short periods, but prolonged operation may reduce engine performance and could affect emissions compliance.
If testing shows the sensor's signal is erratic or out of specification, replacement is appropriate; intermittent codes can also stem from wiring issues that do not require sensor replacement.