P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)

P0330 indicates a malfunction in Knock Sensor 2 circuit on Bank 2. The controller is not receiving a usable knock signal from the second bank sensor circuit.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace Bank 2 knock sensor blindly on engines where access is difficult; verify wiring and signal behavior first.

Symptoms of P0330

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0330

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Compare Bank 2 knock sensor activity, ignition timing correction, engine load, coolant temperature, and any paired low, high, or intermittent knock sensor codes.
Inspect Knock Sensor 2 wiring, connector condition, mounting torque, harness routing, corrosion under the intake where applicable, and sensor ground integrity.
Check for true engine knock or mechanical noise on Bank 2 before concluding the electrical circuit is the only issue.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.