P2346Cylinder 11 Above Knock/Combustion Vibration Sensor Threshold
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Cylinders 11 and 12 exist only on V12 engines, for example BMW's V12 in the 7 and 8 Series, Mercedes-Benz's M120 and its successors, and the V12s of Ferrari, Lamborghini and Aston Martin. P2346 reports that cylinder 11 has knocked above the threshold that the knock control allows in its crank-angle window. With twelve combustions per two crank turns the windows are short, so the module depends on clean crank and sensor signals to assign knock correctly; a fault on the bank sensor or noise from nearby parts can shift the blame. No manufacturer was found that publishes P2346; GM and Saab file a lone knocking cylinder under P0324. Retarded spark on one cylinder costs some power, but continuing knock can destroy the piston.
- What you may notice
- MIL on
- Slight loss of power
- Possibly audible pinging
- Likely causes
- PossibleDeposits or hot spots in cylinder 11
- PossibleFuel below the required octane rating
- RareDisturbed crank or knock sensor signal shifting the cylinder assignment
- 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 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.