P2482 indicates that the engine computer has detected an abnormally high voltage or resistance in the exhaust gas temperature sensor circuit for Bank 1 Sensor 5. This usually points to an open circuit or a short to power, preventing the computer from accurately reading the exhaust temperature.
An internal open circuit within the sensor itself is the most common cause of a high-voltage condition.
Chafed, broken, or corroded wiring and connectors can cause an open circuit or short to voltage.
Corroded, loose, or pushed-back pins in the sensor connector can interrupt the signal circuit.
The sensor signal wire may be shorted to a power source elsewhere in the wiring harness.
An internal fault in the engine computer is extremely rare and should only be considered after all other wiring and sensor issues are eliminated.
Bank 1 refers to the side of the engine containing cylinder number 1, and Sensor 5 indicates the fifth exhaust gas temperature sensor in the line, typically located far downstream near or after the emission aftertreatment systems like a DPF or SCR.
While you may be able to drive temporarily, the engine may enter reduced power mode or fail to regenerate the diesel particulate filter (if equipped), which can lead to costly exhaust blockages over time.
No, it is very unlikely. This code almost always points to a failed exhaust gas temperature sensor or a wiring issue. Replacing the PCM is rarely the correct fix and should only be considered as an absolute last resort after all wiring and the sensor itself have been thoroughly proven functional.
Exhaust gas temperature sensors are typically thermistors that change resistance with temperature. A 'circuit high' reading usually means there is an open circuit—often inside the sensor itself—or a short to power in the wiring, which the computer interprets as an abnormally high temperature value.