P2359Ignition System

Cylinder 6 Above Knock Threshold

P2359 means the knock sensor detected combustion knock in cylinder 6 above the allowed threshold. The ECM retards ignition timing to protect the engine.

🚗 Use caution. Persistent knock can damage internal engine parts 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 create hot spots.

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

20%

A lean condition raises combustion temperatures.

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

15%

A failing sensor can misreport knock.

🩺 Common Symptoms

Pinging or knocking under load
Check engine light
Reduced power
Slightly worse fuel economy
Rough 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 P2359

1Use the correct octane fuel and add a fuel cleaner

2Check for vacuum leaks and lean conditions

3Inspect the knock sensor and wiring

4Consider carbon cleaning if buildup is suspected

❓ Frequently Asked Questions

Can I drive with P2359?

Short term yes, but ongoing knock can damage the engine. Address it soon.

Will better fuel fix P2359?

Often. Using the recommended octane and a cleaner resolves many fuel-related knock cases.

Is the knock sensor bad?

Usually not. It reports real knock most of the time. Rule out fuel and mechanical causes first.

🔗 Related Codes

P2336P2337P2338P0325