Conditions for Setting the DTCs
WARNING: This page is about a different car, the 2018 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
P0325
The ECM detects that a knock sensor signal circuit is open.
P0327
The ECM detects that the knock sensor low signal circuit is out of the calibrated range.
P0328
The ECM detects that the knock sensor high signal circuit is out of the calibrated range.