Code Definition

P0327 — Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0327

P0327 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0327 is stored, the module has detected a signal or supply voltage lower than the expected operating range; a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0327 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0327 fault code is set when the powertrain control module (PCM) detects a signal from knock sensor 1 on Bank 1 that is below the expected voltage range. This may indicate a fault in the sensor, circuit, or related components, leading to reduced ability to detect and adjust for engine knock.

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