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P0330 OBD-II Trouble Code: Knock Sensor 2 Circuit Malfunction (Bank 2)

Check Engine Light

P0330 code definition

P0330 is a general OBD-II trouble code that is indicating a malfunction in the knock sensor circuit 2.

Note: This code is also related to codes P0325, P0326, P0327, P0328, P0329, P0331, P0332, P0333, and P0334.

What the P0330 code means

P0330 is a DTC that is set when a malfunction is detected in the knock sensor 2 circuit that causes it to not operate properly.

Once the ECU detects the malfunction a Check Engine Light will be displayed on the dashboard. The Check Engine Light will remain until the code is cleared or the vehicle is repaired.

What causes the P0330 code?

  • ECU that has failed
  • Faulty knock sensor 2
  • Poor electrical connection for the knock sensor harness
  • Excessively lean condition
  • Open or short in knock sensor wiring harness
  • Engine coolant system fault

What are the symptoms of the P0330 code?

  • In some cases, no symptoms will be noticed other than the Check Engine Light being present.

  • Some vehicles may exhibit a loss of engine power or a hesitation under acceleration.

How does a mechanic diagnose the P0330 code?

  • First, the mechanic will install a scan tool into the car’s DLC port and check for any codes present with its associated freeze frame data.

  • Now, all the codes will be cleared and the vehicle test driven under similar conditions to the freeze frame data to duplicate the fault.

  • A visual inspection will be performed for all wiring, damaged components, or apparent damage.

  • The scan tool will be used to see the live data while the vehicle is running to look at the engine coolant temperature and fuel trims to make sure no cooling system or lean faults that are present.

  • Knock sensor operation will then be checked with the scan tool.

  • Lastly the ECU will be tested for any faults present.

Common mistakes when diagnosing the P0330 code

Mistakes are commonly made when the fuel system or coolant system is the cause of the P0330 code not the knock sensor itself. In these cases, the knock sensor is often replaced without the malfunction going away.

To avoid this, all diagnostic steps must be followed for proper diagnosis.

How serious is the P0330 code?

P0330 does not usually have any driveability concerns associated with it. This code should not prevent vehicle operation or driving to a safe location after the Check Engine Light is seen. However, P0330 will cause the vehicle to fail OBD-II based emission testing in many states.

What repairs can fix the P0330 code?

  • Knock sensor replacement
  • Faulty ECU replacement
  • Open or short in wiring harness repaired or replaced
  • Fixing connection issues
  • Resolving engine coolant system faults
  • Lean condition repair

Additional comments for consideration regarding the P0330 code

An advanced level scan tool is important for diagnosing the P0330 code. To accurately and quickly diagnose this code, access to the vehicle's live data stream if required. The live data stream lets technicians view the voltage, proper operation, resistance, and many other items that are not available with a standard scan tool.

Need help with a P0330 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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