P2476 indicates that the exhaust gas temperature (EGT) sensor circuit for Bank 2, Sensor 4 is reporting a voltage higher than the expected range. This typically points to a faulty sensor, wiring issue, or short circuit, and can affect emissions system operation, particularly diesel particulate filter (DPF) regeneration.
The sensor itself is the most common cause. Internal short or open circuit leads to a high voltage reading.
Wiring insulation damage or a short to a power source can cause the signal wire to read high voltage.
A broken wire or poor connection can cause the PCM to see a high (pull-up) voltage.
Moisture, corrosion, or bent pins at the sensor or PCM connector can create high resistance or a short.
Exhaust leaks or excessive heat near the sensor can cause erratic readings, though this is less common for a high circuit code.
PCM failure is extremely rare for this code. Only consider after thoroughly checking all wiring and the sensor.
It is not recommended to drive long distances. The code may prevent proper DPF regeneration, leading to clogged filters and costly repairs. Limp mode may also reduce drivability.
In most cases, yes. The sensor is the most common failure point. However, always diagnose wiring and connectors first to avoid unnecessary replacement.
Almost never. PCM failure is extremely rare for this code. Many drivers are incorrectly told to replace the PCM, but the issue is almost always the sensor or its wiring.
Bank 2 refers to the side of the engine opposite cylinder #1. Sensor 4 is the fourth exhaust temperature sensor, typically located downstream in the exhaust system, often after the diesel particulate filter or selective catalytic reduction system.