Ignition Systems ControlOBD2 Codes

P0330 – Meaning, Causes, Symptoms, & Fixes

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Code P0330 Definition

Knock Sensor 2 Circuit Malfunction (Bank 2)

Code P0330 Meaning

Knock sensors are solely used for the purpose of sensing when your engine is “knocking,” or sensing when there is exploding in the air/fuel mixture in a way that delivers less power and can also damage the engine if prolonged. When the engine “knocks” there is an excessive amount of NOx that is released. When trouble code P0330 is set, this means that the knock sensor 2 in Bank 2 is not operating properly.

Symptoms of Code P0330

  • Check Engine Light
  • Loss of engine power
  • No noticeable drivability issues

Causes of Code P0330

  • Faulty sensor 2 Bank 2 knock sensor
  • Engine is running excessively lean
  • Faulty or damaged knock sensor wiring
  • Engine coolant system fault

Code P0330 Severity – Low


There are no drivability concerns with trouble code P0330. However, along with all Diagnostic Trouble Codes, there should be a sense of haste in getting this repaired so that there is no further damage to the engine.

Code P0330 Common Diagnosis Mistakes

There are times where the engine/fuel coolant system are the issue and replacing the knock sensor immediately will not make the Check Engine Light turn off.

Code P0330 Diagnosis Steps

  • Tools Needed to Diagnose:
    • FIXD
    • Live freeze frame data (Found on FIXD App with FIXD Sensor)

How To Diagnose P0330

  1. Check to see if there are any other codes along with P0330 and clear your Check Engine Light with FIXD
  2. Test drive the vehicle and attempt to replicate the driving conditions that will also give similar if not the same freeze frame data in an attempt to pinpoint the issue.
  3. Is the knock sensor sending a signal to the PCM? If so, there may be an issue with the coolant temperature readings. If not, the knock sensor may need to be replaced (Step 5). If there are issues with the coolant temperature readings, deal with them ASAP because an overheated engine can definitely cause the engine to knock.
  4. Conduct a visual inspection of the knock sensor wiring, and any connections to the knock sensor to make sure there are no signs of disconnection, tearing, etc.
  5. If the conclusion is that the knock sensor needs to be replaced, then it is often recommended to replace not only the sensor but the knock harness as well.


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  1. Thank you for your very informative post, so often as a nonmechanicly inclined person one can often be led to believe that damages are far greater than they are not to minimize the need to get the repair done immediately but I went to a mechanic and they said something in regards to my head being bad and various other diagnostics that left me with a cost for repairs over $1,100 so again thank you very much I was able to follow up along with your post and the job was $120 plus parts so thank you very much

    1. Where did u get it fixed for $120 ?

  2. My engine is overheating

  3. Hi Michael, Could you please elaborate on what ended up being the root cause and the solution? Did you end up changing the knock sensors or/and the wiring harness?

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