The knock sensor 2 bank 2 is a piezoelectric device that produces an AC voltage of different amplitude and frequency depending on the level of engine mechanical vibration. The engine control module (ECM) uses the sensor to determine if spark knock is occurring during a cylinder combustion event. If spark knock is detected, the ECM will retard timing on succeeding firing cylinders until the spark knock is eliminated. The ECM will always try to work back to zero compensation or no spark retard. In order to differentiate between normal engine noise and actual spark knock, the ECM will sample the knock sensor 2 signal for a certain length of time under different engine speeds and loads during non-cylinder firing events. This sampling is used to determine a range of acceptable normal engine noise. DTC P0332 sets when the ECM does not detect sufficient normal engine noise from knock sensor 2 for a certain length of time.

DTC P0332 will set if knock sensor 2 signal voltage falls below the minimum normal engine noise level, based on engine speed and load when:

DTC P0332 diagnostic runs continuously once the above conditions have been met.

DTC P0332 is a type C DTC.

Important: KNOCK SENSOR 1 voltage on the scan tool may normally be greater than 2 volts difference at idle and up to 4 volts difference at full acceleration than that of KNOCK SENSOR 2. This is due to each bank having different frequency filtering within the ECM.

To locate an intermittent problem, use the scan tool to monitor KNOCK SENSOR 2 voltage while revving the engine up and down the RPM band. The sensor voltage should increase as engine speed increases.

Wiggling the wires under different engine speeds, while using the scan tool to watch for a drop in KNOCK SENSOR 2 voltage, may locate the area where an open or short to ground in wiring may exist.

DTC P0332 may set if knock sensor 2 is loose or installed backwards. The larger metal contact area of the sensor should be contacting the engine block.