P0333 Knock Sensor 2 Circuit Low Input (Bank 2)

Understanding P0333 Knock Sensor 2 Circuit Low Input (Bank 2)

If the check engine light in your car is on, it could mean a lot of things.

One of the codes that may appear is P0333, which indicates an issue with the knock sensor circuit. In this article, we will examine the P0333 code in detail, focusing on the knock sensor 2 circuit low input (bank 2) and what it means for your vehicle.

What is a knock sensor?

Before diving into the specifics of the P0333 code, we should understand what a knock sensor is. Your car’s engine produces a lot of noise, including knocking sounds.

These sounds can indicate that the engine is not operating correctly, which can lead to damage or even engine failure. A knock sensor detects these sounds and sends a signal to the engine control module (ECM), which adjusts the engine’s timing to prevent damage.

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What does the P0333 code mean?

When the ECM detects a problem with the knock sensor circuit, it will trigger the P0333 code. Specifically, the code indicates that there is a low input signal from the knock sensor 2 circuit on bank 2.

In layman’s terms, this means that the ECM is not receiving the correct signal from the knock sensor, which can cause engine issues.

What are the symptoms of P0333?

If your car’s check engine light is on and you see the P0333 code, you may notice a few symptoms. One common symptom is a decrease in engine performance, which can include a reduction in power or acceleration.

You may also hear knocking sounds coming from the engine, which can indicate that the knock sensor is not functioning correctly. In some cases, the car may even stall or fail to start.

What causes P0333?

Several factors can cause the P0333 code to appear. One common cause is a faulty knock sensor, which can occur due to wear and tear or damage from outside forces.

Additionally, damaged wiring or connectors in the knock sensor circuit can cause the low input signal detected by the ECM.

Finally, issues with the ECM itself can cause the code to appear.

How is P0333 diagnosed?

If you suspect that your car has the P0333 code, take it to a qualified mechanic. They will use a diagnostic tool to read the code and determine the cause of the problem. The mechanic will likely inspect the knock sensor and its wiring for any damage or wear and tear. They may also test the ECM to ensure that it is working correctly.

How is P0333 fixed?

The solution to the P0333 code depends on the cause of the problem. If the issue is with the knock sensor itself, the sensor will need to be replaced. Similarly, if the wiring or connectors are damaged, they will need to be repaired or replaced. If the issue is with the ECM, the mechanic may need to reprogram or replace the unit.

In conclusion, the P0333 code indicates an issue with the knock sensor 2 circuit low input (bank 2). This can cause a variety of symptoms, including reduced engine performance and knocking sounds. If you suspect that your car has this code, take it to a mechanic who can diagnose and fix the issue.


  1. Can I drive with the P0333 code?
    It is not advisable to drive with the P0333 code, as it can cause engine damage and even failure.
  2. How much does it cost to fix P0333?
    The cost of fixing P0333 varies depending on the cause of the problem. Replacing the knock sensor can cost anywhere from $100 to $500, while repairing wiring or connectors can cost less.
  3. How long does it take to fix P0333?
    The time it takes to fix P0333 depends on the cause of the problem and the mechanic’s skill level. It can take anywhere from a few hours to a full day.
  4. Can I fix P0333 myself?
    While it is possible to fix P0333 yourself, it is not recommended. It can be challenging to diagnose the issue correctly and replace the knock sensor or repair wiring without causing further damage.
  5. What happens if I ignore the P0333 code?
    Ignoring the P0333 code can cause engine damage and even failure. It is best to have the issue diagnosed and fixed as soon as possible.