P0332 Code: Knock Sensor 2 Circuit Low Input (Bank 2)

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p0332 code displaying on an OBD-2 diagnostic tool

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P0332 code definition

Knock Sensor 2 Circuit Low Input (Bank 2)

What does the P0332 code mean?

The P0332 code means that the knock sensor is detecting a fault. The knock sensor senses engine knocks and detonation, which are sounds created when an engine burns fuel too quickly. The sensor is used to prevent engine damage by shutting down the ignition system if it detects these conditions.

The knock sensor is a part of the ignition system and can be found behind or next to your distributor cap in an older vehicle or near where you would find your spark plugs on newer vehicles—different depending on make and model.

What are the symptoms of the P0332 code?

The Check Engine Light will illuminate your instrument panel.

Your engine may run rough or stall significantly when you accelerate quickly from a stop or make sharp turns at low speeds. This can be caused by a lack of power from your engine because it’s not getting enough air to breathe properly.

You may have difficulty starting your car, which can be attributed to poor fuel economy and poor performance due to an issue with one or more cylinders in your engine not firing correctly (or at all).

What causes the P0332 code?

P0332 can be caused by several different issues, including:

  • A worn or damaged knock sensor
  • Engine knocking (also known as detonation)
  • A problem with engine timing that causes it to run too fast for the conditions you’re driving under (a high-compression ratio will cause this)
  • Low compression in one or more cylinders due to worn pistons, damaged piston rings, or cylinder head cracking/warping

How does a mechanic diagnose the P0332 code?

To diagnose a P0332 code, a mechanic will first use diagnostic trouble codes (DTCs) to narrow down the cause of your Check Engine Light. There are many ways to do this, but one of the most common is to perform an OBD scan using special equipment that can communicate with your vehicle’s computer.

Once they’ve identified the DTC that corresponds with this issue, they’ll need to perform tests on other components to determine which one is at fault. These might include:

  • Checking wiring and connectors for damage or corrosion
  • Testing sensors by manually moving them while monitoring readings from various gauges
  • Replacing control modules if necessary

What repairs can fix the P0332 code?

The repairs that can fix the P0332 code depend on its cause. If the problem is due to a faulty knock sensor, it must be replaced. However, suppose there is an issue with wiring or another component in your vehicle’s ECU (electronic control module). In that case, those components will also have to be repaired or replaced.

How serious is the P0332 code?

It’s a non-critical diagnostic trouble code, meaning your vehicle should be able to run just fine with the fault present.

The most common cause of this code is a bad knock sensor or its harness (the wiring between the sensor and ECU). Other causes include faulty signal circuit wiring, dirty connectors or corrosion on any part of this circuit.


As you can see, this is a very common code that can be fixed by replacing the knock sensor. It’s important to remember that if your car has this code and it seems like everything is fine with it, make sure you get it checked out anyway!