What Does P2346 Mean?
Cylinder 11 Above Knock Threshold indicates the ECM detected knock on cylinder 11 that exceeds the maximum correction range. Found on V12 engines, this code means that despite applying full timing retard, detonation persists on cylinder 11, signaling a cylinder-specific combustion issue.
Common Causes
30%
Carbon deposits in cylinder 11 creating localized hot spots
25%
Fuel injector 11 flow restriction
25%
Knock sensor fault or signal interference
20%
Poor fuel quality or incorrect octane
Diagnostic Steps
1
Step 1: Access per-cylinder knock correction data and identify if cylinder 11 is uniquely affected.
2
Step 2: Test fuel injector 11 delivery volume and spray pattern. Compare to adjacent injectors.
3
Step 3: Perform compression and leak-down tests on cylinder 11.
4
Step 4: Verify knock sensor assigned to this cylinder bank. Check resistance, wiring, and mounting.
5
Step 5: If carbon is found, perform decarbonization appropriate for the engine type (chemical treatment or walnut blasting).
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
Cylinder 11 Above Knock Threshold indicates the ECM detected knock on cylinder 11 that exceeds the maximum correction range. Found on V12 engines, this code means that despite applying full timing retard, detonation persists on cylinder 11, signaling a cylinder-specific combustion issue.
The most common cause of P2346 (Cylinder 11 Above Knock Threshold) is: Carbon deposits in cylinder 11 creating localized hot spots
Typical repair costs for P2346 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Ongoing knock risks severe engine damage. V12 engines are costly to repair internally. Minimize load and repair as soon as possible.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2346 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition/Combustion System
Difficulty
Type
Generic (SAE)
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