What Does P2345 Mean?
Cylinder 10 Above Knock Threshold indicates the ECM detected persistent detonation on cylinder 10 beyond the knock correction capability. This code is found on V10 and V12 engines. Despite maximum timing retard, knock events continue on this cylinder, indicating a mechanical or fuel system issue.
Common Causes
30%
Heavy carbon buildup in cylinder 10 combustion chamber
25%
Fuel injector 10 partially clogged or failing
25%
Knock sensor malfunction or wiring degradation
20%
Insufficient fuel octane or contaminated fuel
Diagnostic Steps
1
Step 1: Monitor per-cylinder knock retard values. Isolated high retard on cylinder 10 confirms a localized problem.
2
Step 2: Test fuel injector 10 with balance test and compare to other cylinders on the same bank.
3
Step 3: Compression test cylinder 10 and compare to manufacturer specification and neighboring cylinders.
4
Step 4: Verify knock sensor signal and wiring for the bank containing cylinder 10.
5
Step 5: Perform combustion chamber decarbonization if elevated compression from carbon deposits is confirmed.
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
Cylinder 10 Above Knock Threshold indicates the ECM detected persistent detonation on cylinder 10 beyond the knock correction capability. This code is found on V10 and V12 engines. Despite maximum timing retard, knock events continue on this cylinder, indicating a mechanical or fuel system issue.
The most common cause of P2345 (Cylinder 10 Above Knock Threshold) is: Heavy carbon buildup in cylinder 10 combustion chamber
Typical repair costs for P2345 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Persistent knock on any cylinder can cause catastrophic engine damage. Avoid high-performance driving and repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2345 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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