Conditions for Setting the DTC: P0326

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The KS signal indicates an engine knock is present.
The ECM has commanded the spark retard to a value, which is more than the calibrated value, for a specific engine load and speed.
The above conditions exist for more than 5 seconds.