P2474 indicates that the exhaust gas temperature (EGT) sensor for bank 2, sensor 4 is reporting a value outside its expected range or showing inconsistent performance. This sensor monitors temperature after the catalytic converter to help the PCM manage emissions and protect the exhaust system. When the signal is deemed out of range, the PCM stores the code and illuminates the check‑engine light.
The sensor itself may be open‑circuit, shorted, or degraded, causing its voltage/resistance to fall outside the programmed limits.
Damaged, corroded, loose, or shorted wires and connectors in the sensor circuit can produce erratic or out‑of‑range signals.
A leak can cause abnormal temperature readings, making the sensor appear to be out of range.
A blocked catalytic converter, particulate filter, or collapsed exhaust can raise temperatures beyond normal limits.
Although rare, a fault in the PCM’s EGT input circuit could incorrectly interpret a good sensor signal as out of range; this is considered only after other causes are ruled out.
No. The PCM is rarely the cause of this code. Most cases are due to a faulty sensor, wiring/connector problem, or exhaust leak. Replace the PCM only after confirming the sensor and its circuit are functioning correctly.
You can usually drive short distances, but the vehicle may enter a reduced‑power mode to protect the exhaust system. Continued operation with an abnormal EGT reading could risk catalyst damage, so it’s advisable to diagnose and repair promptly.
Clearing the code only turns off the check‑engine light; if the underlying fault remains, the code will return. Proper diagnosis and repair are required to prevent recurrence.