The Knock Sensor(KS) is located in the engine and detects the spark. When a spark occurs, the KS sensor produces a voltage signal which is sent to the Powertrain Control Module(PCM) which delays the ignition time, thus preventing engine damage.
The Detonation Sensor (KS) contains a piezoelectric crystal inside. This crystal is used to produce AC voltage. In a sense, the KS sensor is a transducer device as it converts changes in physical quantity into an electrical signal. This sensor does not receive reference voltage from the PCM but rather creates its own voltage.
The DTC code P0330 OBD2 basically means that the PCM has detected a malfunction in the Detonation Sensor circuit. Some vehicles have two KS sensors, in this case, the code refers specifically to sensor number 2. This sensor corresponds to the side of the opposite engine where cylinder number 1 is located.