Code Definition

P0333 — Knock Sensor 2 Circuit High Input (Bank 2)

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

About P0333

P0333 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 P0333 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 P0333 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 P0333 code is activated when the Engine Control Module (ECM) detects a voltage signal from the Knock Sensor 2 in Bank 2 that is higher than normal. This high input signal typically suggests a potential open circuit or a fault in the sensor itself, leading to an abnormally high voltage signal being sent to the ECM. The knock sensor is critical for detecting engine knocking or pinging, conditions that can cause significant engine damage. An inaccurate high signal can impair the ECM's ability to properly adjust engine timing and could impact overall engine performance and efficiency.

Quick Facts