P0334 OBD-II Trouble Code: Knock Sensor 2 Circuit Input Intermittent (Bank 2)

P0334 code definition

The P0334 Trouble Code indicates that the knock sensor on a cylinder is not working according to the manufacturer’s specifications.

What the P0334 code means

The code means that there is a problem with one of the knock sensor circuits. These circuits have a single 5-volt signal wire. When the voltage is 10% too high or too low compared with the manufacturer’s guidelines, the P0334 code will be stored. With some vehicles, it will require several failure cycles before the malfunction indicator lights up on the vehicle.

What causes the P0334 code?

The P0334 code can occur for several reasons:

• Faulty knock sensor
• Broken, frayed, or corroded wiring
• Corroded or broken connectors
• Faulty Engine Control Module (ECM)
• Open or shorted knock sensor harness
• Poor electrical connection in the knock sensor circuit

What are the symptoms of the P0334 code?

One of the common symptoms of a P0334 code is a lack of power in the vehicle, along with a spark knock. There could also be hesitation when you try to accelerate. In addition, the engine light or the service light will likely turn on to indicate that there is a problem. The light could stay on constantly, or it might only appear intermittently.

How does a mechanic diagnose the P0334 code?

The mechanic will utilize an OBD-II scanner to help diagnose the problem. They may also make use of a voltmeter when trying to diagnose the code. They will perform a visual inspection of the wiring and the connectors to make sure there are no problems that they can see. They will also clear the codes and reset the system, and then see if it returns after restarting the vehicle and taking it for a road test.

Common mistakes when diagnosing the P0334 code

One of the biggest mistakes that can occur when diagnosing the P0334 code is believing that the only problem lies with the knock sensor. Replacing the knock sensor when there are other issues with the engine could cause greater issues down the road. It is important for the mechanic to make sure that the sensor is not just doing its job and indicating a serious problem with the engine.

How serious is the P0334 code?

The P0334 code’s seriousness can vary. In some cases, the mechanic might find that it is only a problematic sensor. This in and of itself would not cause serious engine problems. However, there is also the possibility that the sensor could be indicating a larger problem with the engine. It is never a good idea to ignore any issues with your vehicle, even if you feel it might only be a problem with the sensor.

What repairs can fix the P0334 code?

Depending on the overall issue, there are a number of repairs that can help to remove the P0334 code and get the car in shape. They include:

• Clearing the codes and testing the vehicle. If the code returns, the mechanic then needs to determine the cause.
• Replacing the knock sensor. This is only a solution if the problem is actually a faulty knock sensor and not something more serious.
• Checking connections.
• Checking for corrosion or broken and worn out engine parts.

The mechanic can clear the codes and retest the vehicle as they perform different repairs to find the cause of the problem.

Additional comments for consideration regarding the P0334 code

It is common for many people to pay very little attention to these codes, believing that they are just some simple sensor issues that can be ignored until later. In some cases, this might be true. However, there could be a much greater problem with your vehicle. It is always a good idea to take the vehicle to a mechanic as soon as possible. They can properly diagnose the vehicle and repair any issues they find.

Need help with a P0334 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.