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Abnormal combustion (either pre-ignition or detonation) leads to spark knock. Because the phenomenon can easily damage the engine, it must be controlled.  The powertrain control module (PCM) monitors engine “knocking” with the help of a knock sensor. 

When a certain amount of spark knock is detected, the module will retard ignition timing to prevent engine damage. 

What Does the P0332 Code Mean?

Diagnostic trouble code (DTC) P0332 stands for “Knock Sensor 2 Circuit Low Input (Bank 2).”  It belongs to a range of trouble codes that are triggered by a knock sensor malfunction (P0325 to P0334). A P0332 code gets logged when the PCM receives a reading from the knock sensor that is lower than the voltage specified by the manufacturer.

An engine code P0332 means that knock sensor #2 is sending an output voltage to the PCM that is lower than the manufacturer-specified range. Without proper readings from the knock sensor, the PCM cannot accurately alter ignition timing to prevent engine knocking.

Knock sensor found in engine block
A knock sensor helps the powertrain control module (PCM) in monitoring engine “knocking.”

P0332 is a generic trouble code that applies to a variety of makes and models. While the definition of this code is common to vehicles from different manufacturers, the steps for diagnosis and repair may vary depending on make and model.

Many owners have reported p0332 for the following makes: Chevrolet (especially on a Chevy Silverado), GMC, Audi, Pontiac, and GMC.

What are the Possible Causes of the P0332 Code?

  • Faulty or broken knock sensor
  • Open, short, or wiring problem in the knock sensor circuit
  • Malfunctioning PCM

What are the Common Symptoms of the P0332 Code?

Code P0332 often comes with noticeable drivability problems. If you observe any of the symptoms below, get your vehicle checked by a licensed mechanic to prevent serious engine problems.

Check Engine Light

There are many trouble codes that can cause a Check Engine Light to illuminate. The only way to confirm that a P0332 code triggered it is by connecting your vehicle to a scan tool. You may do this at home if you have the tool at your disposal, or you may take your vehicle to a trusted mechanic instead.

Reduced Engine Performance and Fuel Efficiency

A bad knock sensor may also affect your engine’s performance and fuel efficiency. 

How to Diagnose the P0332 Code

It can be challenging to figure out why the P0332 code was logged in the first place, so it might be better to leave the job to your trusted mechanic. However, if you have the necessary DIY car repair skills, you can track down the root cause of the trouble code yourself.

You can check out the videos below to help you better understand the P0332 code and how to properly troubleshoot and fix it:

How to Fix the P0332 Code

There’s no single way to fix the P0332 code as there are several possible reasons why it was logged in the first place. This is why it might be best to leave the job to a professional mechanic.

However, if you believe you have the necessary DIY skills and decide to do the fix yourself, you first need to figure out what’s actually triggering the code. Once you’ve narrowed it down to the exact cause, use online auto repair resources and guides or an ALLDATA single-vehicle subscription to help you fix it.

Do remember that what works for someone else’s car may not work on your car as different carmakers have specific repair instructions for their models. Make sure to consult your owner’s manual before proceeding to fix the P0332 code.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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