P2336Ignition System

Cylinder 1 Above Knock Threshold

P2336 means the knock sensor detected combustion knock (detonation) in cylinder 1 above the threshold the ECM allows. The ECM normally retards timing to compensate.

🚗 Use caution. Persistent knock can damage pistons and bearings over time.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Low octane or poor quality fuel$0-$60

35%

Fuel below the recommended octane rating causes detonation.

#2Carbon buildup in the cylinder$100-$400

25%

Deposits raise compression and hot spots that trigger knock.

#3Lean fuel mixture or vacuum leak$50-$300

20%

A lean condition raises combustion temperatures.

#4Faulty knock sensor or wiring$80-$350

15%

A noisy or failing sensor can misreport knock.

🩺 Common Symptoms

Pinging or knocking noise under load
Check engine light
Reduced power from timing pullback
Slightly worse fuel economy
Rough running under acceleration

💰 Repair Cost: DIY vs Shop

DIY Cost

$0-$150

Shop Cost

$100-$500

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2336

1Fill up with the correct octane fuel and add a fuel system cleaner

2Check for vacuum leaks and lean conditions

3Inspect the knock sensor and wiring

4Consider a carbon cleaning if buildup is suspected

❓ Frequently Asked Questions

Can I drive with P2336?

Short term yes, but ongoing knock can damage the engine. Address it soon, starting with correct fuel.

Will better fuel fix P2336?

Often. Using the recommended octane and a good cleaner resolves many knock cases caused by fuel quality or deposits.

Is the knock sensor bad?

Not usually. The sensor is reporting real knock most of the time. Rule out fuel and mechanical causes first.

🔗 Related Codes

P2337P2338P0325P0332