OBD-II Trouble Codes

P0327: Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

Reading Time: 3 minutes

Your vehicle is equipped with a number of sensors that are used for monitoring all kinds of information. Among them is the knock sensor, which is located near the engine that detects vibrations caused by  engine detonation or “knock.” 

P0327 is one of several trouble codes related to a faulty knock sensor. If your scan tool is showing this code, read on to learn more about the symptoms, probable causes, and other pertinent information

What Does the P0327 Code Mean? 

Diagnostic trouble code (DTC) P0327 stands for “Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor).” It is triggered when the powertrain control module (PCM) detects very low voltage readings from your vehicle’s primary knock sensor circuit. 

Take note that the voltage value may vary depending on your vehicle’s make and model. 

Mechanic using car diagnostic scan tool
If your scan tool is showing code P0327, the problem could be related to a faulty knock sensor.

What Do Knock Sensors Do? 

The main purpose of your knock sensor is to alert the PCM when one or more engine cylinders are knocking. Once it detects knocking or pinging in your engine, it will send a voltage signal to the PCM. The latter will then use this data to retard ignition timing and avoid engine knocking. 

Knocking (detonation) results from abnormal combustion that is usually caused by low octane fuel, over-advanced ignition timing, or high engine operating temperatures.

A bad knock sensor should not be taken lightly because it may lead to engine damage. 

What are the Possible Causes of the P0327 Code? 

P0327 is a generic code. This means that it is supported by various makes and models. However, the diagnostic and repair procedures may vary depending on your vehicle’s make and model. 

Here are the possible triggers of a P0327 code: 

What are the Common Symptoms of the P0327 Code? 

Symptoms related to the P0327 code may vary depending on your vehicle. Here are the common ones you should watch for: 

In some cases, the engine may not exhibit any noticeable symptoms related to the P0327 code. As a general rule, once your check engine light illuminates, make sure to have your vehicle checked by your mechanic. 

How to Diagnose the P0327 Code 

With numerous possible causes, it usually takes an expert to be able to pinpoint the underlying cause of an OBD-II code. However, that doesn’t mean that you can’t attempt to diagnose the issue yourself, especially if you have some automotive repair skills and know-how.  

Here’s a helpful video reference you can watch to help you understand and do the diagnostic process:

How to Fix the P0327 Code 

The solution for the P0327 code varies based on two main factors: what triggered the code, and your vehicle’s make and model. This can make it difficult to determine the right fix if you aren’t well-versed in automotive repair or OBD-II codes in general. 

Not only will you have to identify the exact cause of the issue, but you also need to ensure that the solution is appropriate to your vehicle. 

Once you’ve diagnosed the problem that’s causing it, the next step is to do some research on the repairs that have worked for other vehicle owners who have experienced the code due to the same issue. The exact repair may differ depending on the vehicle, so make sure to limit your research to similar vehicles. 

For example, replacing the affected knock sensor is reported to have resolved code P0327 in certain Chevy vehicles, so if you have a Chevy Astro or Silverado 1500, this could work for you as well⁠—provided that the knock sensor is the underlying cause for you, of course.

Mechanic reading instructions from car manual
When fixing the P0327 code, it helps consulting your car manual.

When doing any kind of work on your car, make sure to consult online auto repair resources to ensure that you are guided accordingly. You can also secure an ALLDATA subscription for single vehicles for in-depth factory repair information. 

And remember⁠—always consult your owner’s manual when doing any DIY work on your vehicle.

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