P0333Ignition System

Knock Sensor 2 Circuit High (Bank 2)

P0333 means the knock sensor circuit on bank 2 reads a high voltage. Common causes are a short to voltage, an open circuit, a failed sensor, or wiring problems.

🚗 Driveable but the ECM may retard timing, cutting power and economy. Diagnose promptly to protect the engine.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty knock sensor$50-$400

40%

A failed sensor reports high.

#2Short to voltage or open in wiring$50-$300

30%

A short to power or open pulls voltage high.

#3Connector corrosion$20-$150

15%

Corrosion shifts the signal voltage.

🩺 Common Symptoms

Check engine light
Reduced power
Poor fuel economy
Pinging under load
Retarded ignition timing

💰 Repair Cost: DIY vs Shop

DIY Cost

$20-$400

Shop Cost

$150-$700

📋 Free OBD2 Code Cheat Sheet

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

🔧 How to Diagnose P0333

1Read bank 2 knock sensor live data

2Inspect the signal wiring for shorts to voltage or opens

3Check the connector for corrosion

4Replace the knock sensor if faulty

❓ Frequently Asked Questions

Can I drive with P0333?

Usually yes, but the ECM may retard timing and cut power. Diagnose promptly to protect the engine.

What is the most common cause of P0333?

A faulty knock sensor or a short to voltage/open in the wiring are the most common causes.

How much does P0333 cost to fix?

A knock sensor typically runs $50-$400, though labor can be high if it sits under the intake.

🔗 Related Codes

P0328P0331P0332P0326