Code Definition

P0325 — Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

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

About P0325

P0325 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 P0325 is stored, the module has detected 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 P0325 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 P0325 fault code is set when the powertrain control module (PCM) detects an issue in the knock sensor circuit for sensor 1, located on Bank 1. The knock sensor monitors vibrations caused by engine knock (pre-ignition) and sends signals to the PCM to adjust ignition timing. A malfunction in this circuit may result in reduced engine performance and increased emissions.

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