DTC P0327: Knock Sensor Circuit Low Input - Bank 1 & DTC P0332: Knock Sensor Circuit Low Input - Bank 2: Description

The Knock Sensor (KS) system is used in order to detect any engine detonation, or spark knock. The Engine Control Module (ECM) will retard the spark timing based on the signals from the KS. The knock sensors produce an AC voltage that is sent to the ECM. The amount of AC voltage produced is proportional to the amount of knock.

An operating engine produces a normal amount of engine mechanical vibration, or noise. The KS will produce an AC voltage signal from this noise. When the engine is operating, the ECM will learn the minimum and maximum amplitude of the noise the engine produces. If the ECM detects that this amplitude is below the normal operating range, DTC P0327 or P0332 will set.