P0333 Knock Sensor 2 Circuit High Input (Bank 2)

P0333 points to a high input condition in Knock Sensor 2 circuit on Bank 2. The Bank 2 knock signal or voltage is above the expected operating range.

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 assume a high knock sensor input is always true detonation; verify the Bank 2 circuit before changing fuel or timing strategy.

Symptoms of P0333

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 P0333

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

Review Bank 2 knock voltage, timing retard, freeze-frame load, engine noise, and whether other sensor high-voltage or reference faults are present.
Inspect for open signal wiring, poor terminal contact, short-to-voltage faults, damaged shielding, loose mounting, and water or corrosion at connectors.
Use scan data or a scope to separate electrical high input from true knock, mechanical impact noise, or harness-induced spikes.

Related OBD-II codes

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