Cylinder 2 Knock Detected - P2336
The P2336 code indicates that the engine control module (ECM) has detected a knock (detonation) in cylinder 2 that exceeds the acceptable threshold. This is typically caused by abnormal combustion, such as pre-ignition or detonation, which can damage the engine if not addressed. Common causes include low-octane fuel, carbon buildup, faulty knock sensor, or engine mechanical issues.
01. Most Common Causes
- Low-octane fuel or incorrect fuel grade
- Carbon buildup on pistons or valves
- Faulty knock sensor or wiring
- Engine overheating or cooling system issues
- Incorrect ignition timing or ECM calibration
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine knocking or pinging noise, especially under load
- Reduced engine performance and fuel economy
- Possible engine misfire or rough idle
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Inspect knock sensor and wiring for damage or corrosion.
Step 3: Check fuel quality and octane rating; verify fuel system pressure.
Step 4: Perform a compression test on cylinder 2 and adjacent cylinders.
Step 5: Inspect for carbon buildup using a borescope; clean if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with a knock code can cause severe engine damage. It is recommended to have the vehicle diagnosed and repaired immediately.
How much does it cost to fix?▼
The cost varies depending on the cause. Simple fixes like using higher octane fuel cost nothing, while replacing a knock sensor or cleaning carbon buildup can range from $100 to $300.