P0330 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)

Understanding the P0330 Knock Sensor 1 Circuit Intermittent Error Code

Have you ever seen the P0330 error code pop up on your car’s dashboard?

It can be quite alarming, especially if you don’t know what it means.

In this article, we’ll explore what the P0330 error code is, what causes it, and how you can fix it.

What is the P0330 Error Code?

The P0330 error code is a diagnostic trouble code (DTC) that indicates the knock sensor 1 circuit is experiencing intermittent issues.

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This typically means that the sensor is not functioning properly, which can lead to engine problems and decreased performance.

The knock sensor is a crucial component in your car’s engine. It’s responsible for detecting vibrations within the engine, which can indicate the presence of detonation or pre-ignition.

This information is then sent to the engine control module (ECM), which adjusts the engine’s timing and fuel delivery to prevent damage.

What Causes the P0330 Error Code?

There are several possible causes of the P0330 error code. The most common include:

  1. Faulty Knock Sensor: The knock sensor itself may be faulty, causing intermittent issues and triggering the error code.
  2. Wiring Issues: Damaged or corroded wiring can interfere with the signal sent by the knock sensor, resulting in intermittent errors.
  3. Failed PCM: If the powertrain control module (PCM) has failed, it may not be able to properly communicate with the knock sensor, leading to errors.
  4. Engine Problems: Issues with the engine, such as carbon buildup or a malfunctioning ignition system, can cause false signals to be sent to the knock sensor, resulting in errors.

How to Fix the P0330 Error Code

Fixing the P0330 error code will depend on the underlying cause. Here are some common solutions:

  1. Replace the Knock Sensor: If the knock sensor itself is faulty, it will need to be replaced. This is a relatively straightforward repair, but it may require some mechanical expertise.
  2. Repair Wiring Issues: If the issue is with the wiring, it will need to be repaired or replaced. This may involve tracing the wiring throughout the car and identifying the source of the problem.
  3. Replace the PCM: If the PCM is the issue, it will need to be replaced by a qualified mechanic.
  4. Solve Engine Problems: If the engine itself is causing the issue, it will need to be repaired or serviced. This may involve cleaning or replacing parts of the engine.


The P0330 error code can be a frustrating problem to deal with, but it’s not insurmountable. By understanding what causes the error code and how to fix it, you can take steps to keep your car running smoothly and avoid costly repairs down the line. If you’re not comfortable performing these repairs yourself, it’s always best to consult with a qualified mechanic who can diagnose and fix the issue for you.


  1. What is a knock sensor?
    A knock sensor is a component in your car’s engine that detects vibrations, which can indicate the presence of detonation or pre-ignition.
  2. Can driving with a P0330 error code damage my engine?
    Yes, driving with a faulty knock sensor can lead to engine problems and decreased performance over time.
  3. How much does it cost to replace a knock sensor?
    The cost of replacing a knock sensor can vary depending on the make and model of your car, as well as labor costs. It can range from $150 to $500.
  4. How do I know if my knock sensor is failing?
    Symptoms of a failing knock sensor can include decreased performance, engine knocking or pinging sounds, and a decrease in fuel efficiency.
  5. Can I drive my car with a P0330 error code?
    While it’s possible to drive with a P0330 error code, it’s not recommended as it can lead to engine damage. It’s best to have the issue diagnosed and repaired by a qualified mechanic.