Cylinder 12 Knock Detected
The P2347 code indicates that the knock sensor has detected excessive vibration or knocking in cylinder 12, which is above the normal threshold. This is often caused by abnormal combustion, such as detonation or pre-ignition, which can lead to engine damage if not addressed promptly.
01. Most Common Causes
- Low-quality or incorrect octane fuel
- Carbon buildup in cylinder 12
- Faulty knock sensor or wiring
- Engine mechanical issues (e.g., worn piston rings, valve problems)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Audible knocking or pinging noise from engine
- Reduced engine performance and fuel economy
- Possible engine misfire
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Inspect knock sensor and wiring for damage or corrosion.
Step 3: Check fuel quality and octane rating; consider using higher octane fuel.
Step 4: Perform a compression test on cylinder 12 to check for mechanical issues.
Step 5: Inspect for carbon buildup and clean if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as continued knocking can cause severe engine damage. Have it diagnosed and repaired as soon as possible.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and simple fixes like using higher octane fuel or replacing a knock sensor. More extensive repairs can cost more.