Most vehicles are equipped with the ECT (Engine Coolant Temperature) sensor. This sensor sends a signal to the PCM (Powertrain Control Module) and indicates a voltage reading. This reading is the vehicle’s temperature value.
The DTC P0217 OBD2 means that the engine is in an overheat condition. Usually, the temperature is above 240°F, but it may vary according to the cooling system manufacturer.
The overheat light turns on to prevent any damage to the engine, so it is recommended that the engine be shut down as soon as possible.