P0324Knock/Combustion Vibration Control System Error
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P0324 concerns the knock control as a whole rather than a single sensor circuit. GM and Saab's GM-based engines set it when excessive knock persists on one cylinder – knock despite ignition retard, or mechanical noise taken for knock – for more than 8–10 s; GM's 2018 engines in the first trip, older ones after two. Older GM calibrations also flag an abnormally low or flat signal per cylinder here. Ignition is retarded. Typical causes are low-octane fuel, carbon deposits, high intake or coolant temperature, lean running, or loose parts and valve train noise. Ford does not use this code; GM reports internal processor faults separately (P06B6/P06B7).
- What you may notice
- Check engine light on
- Loss of power from ignition retard
- Audible pinging or knocking under load
- Higher fuel consumption
- Likely causes
- LikelyGenuine knock: low-octane fuel, carbon deposits, high intake or coolant temperature, lean mixture
- PossibleMechanical noise taken for knock (loose parts, brackets, valve train, bearings)
- PossibleKnock sensor damaged, wrongly torqued or mounted with sealant
- RareEngine software or calibration
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.