P0327 – Knock sensor (KS) 1, bank 1 -low input Nov 18, 2015P0327 stands for knock sensor low input. This means the PCM has detected a problem with the knock sensor or its circuit. Some vehicles may be equipped with two knock sensors. Code P0327 pertains to the sensor on bank 1 (the side of the engine where the #1 cylinder is located). What are the common causes of code P0327 ? OBD-II Trouble Code: P0327 Knock Sensor Circuit Low Input P0327 Knock Sensor DTC Code Technical Description. Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles.