P0330 - OBD Trouble Code

<<See All OBD Codes

P0330 is a diagnostic trouble code for knock sensor 2 Circuit Malfunction (Bank 2). This trouble code is detected when an excessively low or high voltage from a sensor is sent to Engine Control Module. When trouble code P0330 is set, this means that the knock sensor 2 in Bank 2 is not operating properly. Once the ECU detects the malfunction a Check Engine Light will be displayed on the dashboard. You may even not face any noticeable drivability issues. However, along with all Diagnostic Trouble Codes, there should be a sense of quickness in getting this repaired so that there is no further damage to the engine.

P0330 is a diagnostic trouble code that is set when a malfunction is detected in the knock sensor 2 circuit that causes it to not operate properly. Knock sensors are usually bolt into or thread into the engine block. They work by sending a message to the PCM when one or more of the cylinders of the engine is knocking. If the knock sensor is not working properly, and it’s always indicating a knock, the PCM will then response to change the ignition timing of the engine. Code P0330 Indicates there's a malfunction in the circuitry that controls and monitors the #2 knock sensor. Due to this you may face a little lack of engine power while driving. Trouble codes should be rectified as soon as possible to avoid any serious problems in near future as it is a matter of your expensive automobile.

What causes the problem of Knock Sensor 2 Circuit Malfunction (Bank 2)?

• Knock sensor 2 failure
• Knock sensor harness has poor electrical connections
• Knock sensor wiring harness is shorted
• ECU failure
• Extremely lean condition
• Faulty engine coolant system

1. Knock Sensor - Knock sensors are usually bolt into or thread into the engine block. They work by sending a message to the PCM when one or more of the cylinders of the engine is ‘knocking.’ The PCM then uses this information to fine tune the engine so it will stop from knocking. So, if you want your vehicle to run smoothly then always replace the faulty knock sensors.
2. Engine Coolant System - Your car's cooling system always releases the surplus heat from the engine as the car burns fuel and ensure its efficient working. If you ever discover that any part of your engine cooling system is frayed or faulty, please repair or replace them on priority basis.
3. Electronic Control Unit - Electronic Control Units, which are among the most crucial components of a modern-day automobile as they control a series of actuators on an internal combustion engine to ensure optimal engine performance. Ensure its proper functionality to avoid any associated trouble codes.

You may notice drivability problems including a lack of power and perhaps some hesitation. There may also be other symptoms like,

• Check Engine Light will illuminate
• Engine pings on acceleration
• Engine may be running hotter than normal
• In rare cases, the engine may not exhibit noticeable symptoms

P0330 does not usually have any drivability concerns associated with it. This code should not prevent vehicle operation even after the Check Engine Light is seen. However, P0330 will cause the vehicle to fail OBD-II based emission testing and may cause damage to the engine in near future. Below are some repairs or replacements which may help to fix this trouble code:

• Replacement of faulty knock sensor
• Replacement of Faulty ECU
• Repair or replace open or short in wiring harness
• Always Fix connection issues
• Resolve engine coolant system faults

Kindly replace the faulty parts immediately for the smooth functioning of your expensive automobile. We offer you a wide range of all top-grade replacement parts on the best prices available. Have a tour of our web and discover more.

This trouble code is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model. Steps to diagnose this code are as follows:

• Verify if there are any other codes along with P0330 and clear your Check Engine Light.
• Test drives the vehicle and attempt to replicate the driving conditions that will also give similar freeze frame data.
• Check if knock sensor is sending signals to PCM or not? If so, there may be an issue with the coolant temperature readings. If not, the knock sensor may need to be replaced.
• If the issues are with the coolant temperature readings then solve this issue ASAP because an overheated engine can always cause the engine to knock.
• Visually inspect the knock sensor wiring and connector, check is there is any sign of cuts or corrosions.
• 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.

Common Mistakes When Diagnosing the P0330 Code

The most common mistake while diagnosing this trouble code is that people usually replace the knock sensors without checking them thoroughly as the problem could be because of fuel system or even coolant system as well. So, it’s always recommended that the diagnosis should be done by an experienced diagnostician.