Code Definition

P0326 — Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

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

About P0326

P0326 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 P0326 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour; 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 P0326 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 P0326 fault code is triggered when the powertrain control module (PCM) detects that the signal from knock sensor 1 on Bank 1 is outside the expected range or does not align with engine operating conditions. This may impair the PCM's ability to adjust ignition timing, potentially leading to engine knock or suboptimal performance.

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