What Does P2341 Mean?
Cylinder 6 Above Knock Threshold indicates the knock sensor system detected persistent detonation on cylinder 6 that exceeds the ECM's maximum timing retard capability. The combustion events in this cylinder are abnormally violent despite the ECM applying maximum knock mitigation.
Common Causes
30%
Carbon buildup in cylinder 6 increasing effective compression ratio
25%
Restricted fuel injector on cylinder 6 causing lean condition
25%
Knock sensor malfunction or degraded wiring
20%
Poor fuel quality or incorrect octane rating
Diagnostic Steps
1
Step 1: Review per-cylinder knock retard data. Isolated high retard on cylinder 6 confirms a localized issue.
2
Step 2: Test fuel injector 6 flow and spray pattern. Use an injector balance test or swap with an adjacent injector to verify.
3
Step 3: Perform compression test on cylinder 6 and compare to specifications and other cylinders.
4
Step 4: Inspect knock sensor resistance and signal integrity. Check for proper mounting torque and clean contact surface.
5
Step 5: If compression is elevated from carbon, perform a decarbonization service appropriate for the engine.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
Cylinder 6 Above Knock Threshold indicates the knock sensor system detected persistent detonation on cylinder 6 that exceeds the ECM's maximum timing retard capability. The combustion events in this cylinder are abnormally violent despite the ECM applying maximum knock mitigation.
The most common cause of P2341 (Cylinder 6 Above Knock Threshold) is: Carbon buildup in cylinder 6 increasing effective compression ratio
Typical repair costs for P2341 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Ongoing knock events risk piston damage and rod bearing failure. Reduce engine load and have the condition diagnosed and corrected promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2341 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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