P0330 – Meaning, Causes, Symptoms, & Fixes

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

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

Causes

  • 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).
    1. 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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