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The engine code P0330 is set when your vehicle’s computer perceives a problem with the knock sensor or its circuit. This guide will give you a general idea of the common causes and symptoms of this code, how to troubleshoot it, and more.

What Does the P0330 Code Mean?

Diagnostic trouble code (DTC) P0330 stands for “Knock Sensor 2 Circuit (Bank 2).” It indicates that a malfunction has been detected with the #2 knock sensor or its circuit.

The knock sensor monitors engine “knock”—this indicates that the engine is experiencing unusual combustion in the form of detonation or pre-ignition.

knock sensor
Code P0330 may be set when your PCM detects a problem with the #2 knock sensor or its circuit.

The knock sensor is usually bolted or threaded into the engine block. It sends a message to the vehicle’s computer or powertrain control module (PCM) whenever it detects that one or more of the engine cylinders are knocking. The PCM then uses the information to adjust the ignition timing in order to prevent more knocking.

The P0330 code is stored in your vehicle’s memory when the PCM detects that the input voltage from the knock sensor 2 is either too high or too low. If left unaddressed, this error code could lead to more serious engine problems and damage.

If you’re planning to fix P0330 yourself, you can read our in-depth technical discussion about knock sensors for more information. Otherwise, continue reading for the most likely causes of P0330.

What are the Possible Causes of the P0330 Code?

Determining the root cause of any trouble code is important when coming up with an effective, long-term solution to the problem. Here are the possible causes of the P0330 error code:

  • Defective knock sensor
  • Issues with the knock sensor circuit (e.g., damaged wiring or poor connections)
  • PCM issues
  • Engine mechanical problems
engine lack of power
Drivability problems such as lack of power and engine hesitation when accelerating are some of the common symptoms of the P0330 code.

What are the Common Symptoms of the P0330 Code?

Below is a list of the common symptoms you may encounter when you’re dealing with this error code:

  • Check engine light
  • Engine pings on acceleration
  • Engine may be running hotter than normal
  • No noticeable symptoms (rare)
  • Drivability problems (e.g., lack of power and hesitation)

How to Diagnose the P0330 Code

Troubleshooting OBD-II codes, like the P0330, involves determining the root cause. However, this can prove to be difficult, given that most codes have multiple possible causes.

For the average DIYer, it’s important to rely on easy-to-follow and informative resources, such as repair guides and other manuals. You can use the video resources below to get more information on how to diagnose the P0330 code:

How to Fix the P0330 Code

Given that vehicles are built differently depending on their make and model and there are various reasons why an error code can appear, there is no single solution that can resolve the code⁠—you’ll have to dig deeper to figure out the required fix.

This is why analysis and troubleshooting are very important steps that you’ll have to take before making any P0330 repairs. Once you’ve determined the exact underlying cause, do some research on forums and other similar platforms to find repairs that have worked to clear the P0330 code⁠. Ideally, you’ll want to stick to information shared by people who own the same vehicle.

Repair manuals, online resources, and advice from a professional mechanic can also help you determine the right fix for your P0330 code.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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