P0324
Knock/Combustion Vibration Control System Error
The knock-control subsystem reports an internal error — typically a self-test fault or a noise floor that cannot be calibrated. The system protects against detonation by retarding ignition; with this fault knock control is disabled.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
What we see in the workshop
ON FORD ECOBOOST
Knock control faults on a tuned EcoBoost need care — we check fuel quality and for genuine detonation before replacing the sensor, because a real knock event is a much more serious problem.
Common causes
Ordered by how often each turns out to be the cause.
- Internal knock-control faultCommon
- Gateway module routing CAN messages incorrectlyLess likely
- CAN terminating resistor (120 Ω) drifted out of specLess likely
Parts involved
- Knock Sensor
- Powertrain Control Module
P0324 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.