Code Definition

P0328 — Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

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

About P0328

P0328 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 P0328 is stored, the module has detected a signal or supply voltage higher 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 P0328 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 P0328 code is triggered when the Engine Control Module (ECM) detects a higher than normal voltage signal from the Knock Sensor 1 in either Bank 1 or in vehicles with a single sensor system, from the primary knock sensor. This sensor is responsible for detecting engine knock or pinging, a condition that can cause engine damage. A high input signal may indicate an open circuit, or a potential fault in the sensor itself, resulting in the ECM receiving an abnormally high voltage signal. This can lead to incorrect adjustments of engine timing by the ECM, potentially impacting engine performance...

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