Cylinder 1 Knock Detected
The P2336 code indicates that the engine control module (ECM) has detected knock (detonation) in cylinder 1 that exceeds the normal threshold. This can be caused by low-octane fuel, carbon buildup, incorrect ignition timing, or a faulty knock sensor. Continued operation may lead to engine damage.
01. Most Common Causes
- Low-octane fuel
- Carbon deposits in cylinder 1
- Faulty knock sensor
- Incorrect ignition timing
02. Symptoms You Will Notice
- Check Engine Light on
- Engine knocking or pinging noise
- Reduced engine performance
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect knock sensor wiring and connector for damage.
Step 3: Test knock sensor resistance and signal with a multimeter.
Step 4: Check fuel octane rating and fill with recommended fuel.
Step 5: Perform a compression test on cylinder 1 to check for mechanical issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as continued knock can cause severe engine damage. Limit driving and address the issue promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary: replacing a knock sensor can be $100-$300, while addressing carbon buildup or fuel issues may be less.