P0332 - Knock Sensor 2 Circuit Low Input (Bank 2)

P0332 is stored when the Engine Control Module (ECM/PCM) detects an abnormally low voltage signal from knock sensor 2 on bank 2. The knock sensor is a piezoelectric sensor that generates an AC voltage signal based on engine vibrations. The ECU uses this data to retard ignition timing if 'knock' or detonation occurs. A 'Circuit Low' condition typically indicates that the sensor's signal voltage has fallen below a calibrated limit (often < 0.5V) or is shorted to ground. When this code is active, the ECU will often switch to a fail-safe ignition map with retarded timing to prevent engine damage.