P2484 indicates the exhaust gas temperature sensor 5 on bank 1 (the engine bank containing cylinder 1) is providing an intermittent or erratic signal to the powertrain control module. This sensor monitors post-catalyst or post-DPF temperatures, depending on vehicle configuration. The intermittent nature suggests a wiring or connector problem rather than a completely failed sensor.
Internal sensor degradation or contamination causing sporadic voltage output fluctuations. This is the most common actual failure.
Damaged, chafed, or corroded wiring between the sensor and PCM, including intermittent opens or shorts.
Poor electrical connection at the sensor connector or PCM connector causing intermittent signal loss.
Exhaust leaks near the sensor location can introduce false temperature readings and cause erratic signals.
Carbon deposits, oil fouling, or coolant contamination on the sensor tip causing abnormal readings.
Rarely, a fault in the control module's sensor input circuit. This is the least likely cause and should be diagnosis of exclusion.
No. While some may suggest PCM replacement, this is almost never the fix for P2484. The PCM is rarely at fault. Focus on the sensor, wiring, and connectors first.
Driving is possible but not recommended. The intermittent nature may lead to sudden limp-mode activation or emission system issues. Have it diagnosed promptly.
Yes, P2484 appears more frequently in diesel vehicles with diesel particulate filter (DPF) systems, as sensor 5 is typically the post-DPF temperature sensor.
Not always. Because the code is 'intermittent/erratic', the issue is often wiring or connector-related. A new sensor may not resolve the problem if the underlying wiring issue persists.