P2470 means the exhaust gas temperature (EGT) sensor on bank 1, sensor 4 is reporting a voltage lower than the expected range, indicating a low‑voltage condition in its sensor circuit.
The sensor itself may have an internal short to ground or an open circuit, causing its output voltage to stay low.
Damage to the sensor’s signal wire (e.g., chafing, rodent damage) can pull the voltage low or interrupt the signal entirely.
Moisture, dirt, or vibration can cause poor contact, increasing resistance and pulling the sensor voltage below spec.
Only plausible after verifying the sensor and wiring are good; a defective driver can fail to provide the proper reference voltage.
Changes that alter exhaust flow or temperature can cause the sensor to read abnormally low, though this is less common than hardware faults.
No. The PCM is rarely the cause; most P2470 faults are due to a bad sensor, wiring, or connector. Only after those are verified good should PCM failure be considered.
You can drive short distances, but the code may trigger reduced power or limp mode and could lead to increased emissions. It’s best to diagnose and repair promptly.
Clearing only turns off the Check Engine Light; if the underlying fault remains, the code will return once the conditions are met again.