P0324 Knock Control System Error

P0324 indicates a knock control system error. The controller has detected a problem in the system that listens for detonation and adjusts timing to protect the engine.

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 ignore P0324 on a knocking engine because loss of reliable knock control can increase engine damage risk.

Symptoms of P0324

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 P0324

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 knock sensor data, ignition timing correction, fuel octane, engine noise, coolant temperature, load, and companion knock sensor circuit codes.
Inspect knock sensor mounting torque, connector condition, harness routing, sensor grounds, engine mechanical noise, and calibration or module faults.
Separate true knock, mechanical noise, and electrical knock-sensor problems before changing ignition timing or replacing sensors.

Related OBD-II codes

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