P0324 code meaning
Knock/Combustion Vibration Control System Error
Powertrain system Generic code P03xx codes Check engine light
What P0324 means
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).
P0324 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0324
- Check engine light on
- Loss of power from ignition retard
- Audible pinging or knocking under load
- Higher fuel consumption
Common causes of P0324
- Most 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
- Less likelyEngine software or calibration
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Knock controlKnock sensorsEngine control module
What each part of P0324 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 24 | The exact fault in that area. |
What to do next
- Note P0324 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0324
What does P0324 mean?
P0324 means "Knock/Combustion Vibration Control System Error". P0324 concerns the knock control as a whole rather than a single sensor circuit. It is a generic code, so it means the same on every make.
Is it safe to drive with P0324?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0324 fail an emissions test?
Yes, it can. P0324 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0324 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0324 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.