HomeOBD 2 CodesP0325: Knock Sensor (KS) Circuit Bank 1

P0325: Knock Sensor (KS) Circuit Bank 1

The Diagnostic Trouble Code P0325 means the Powertrain control model (PCM) has detected a malfunction with the knock Sensor circuit on bank 1. 

We have created this easy to use guide to help you if your vehicle experiences this code. Find our guide below where we cover many aspects of this error code. From symptoms of this code, causes and also common costs to repair the issue, read on to learn more. 

Meaning of Code P0325

Code P0325 indicates that Knock Sensor 1 in Bank 1 is not functioning properly, mainly due to a circuit fault. The knock sensors are built in the vehicle solely to sense engine knocking. 

Knock sensors play an essential role in modern engines because of their reasonably high compression ratios. 

These knock sensors are built to detect the pre-detention or knocking in the engine due to the high pressure built in the combustion tank. This is caused when there is  an uncontrolled explosion in the air/fuel mixture in a way that can damage the engine. 

The PCM of the vehicle will set this error code in the powertrain control module (PCM) when it does not receive the correct information from the knock sensor. It causes the  check engine light to be illuminated on the dashboard.

It is necessary to resolve this problem as soon as possible to avoid engine damage. High emissions can also result when the knock sensors are not working properly.


Symptoms of Code P0325

Sometimes, there may be no noticeable symptoms and major drivability issues associated with faulty knock sensors. However, the potential symptoms of faulty knock sensors are:

  • Illuminated check engine light
  • Increased Fuel Consumption
  • Detonation of engine
  • Decreased engine power
  • An audible pinging engine noise while accelerating.

Root Causes of this trouble code

The most common cause of the code P0325 is a faulty knock sensor. Well, that is not the only thing that could be causing your vehicle to set OBD-II DTC P0325.

Below are some possible causes of code P0325:

  • Defective knock sensor on bank 1 
  • Failed powertrain control module
  • Broken electrical connection
  • Wiring short/fault in the sensor circuit
  • Excessive engine knock
  • Engine cooling system fault
  • Improperly Installed Knock Sensor
  • Damaged or loose connections

Possible Solutions to DTC P0325

As far as troubleshooting and repairing of DTC P0325, the following factory repair details are suggested because different automotive manufacturers have different instructions on fixing the root cause of trouble codes.

The only surefire way to grab the root cause and replace the right part in the first turn is by using an automotive scanner. The other strategy that might work is replacing the knock sensor considering it usually is the main culprit behind code P0325.

However, if it’s not, then double-check the wiring of the knock sensor circuit. You will need to access the correct wiring information before attempting this type of diagnosis. 

A good multimeter and service information is required when trying to diagnose this yourself. Check the resistance of the circuits that run to this knock sensor. Checking the resistance of the sensor is another strategy if you have the specifications.

Associated Risks with Code P0325

If you find this code stored in the PCM we suggest not driving the vehicle any further. While it may be a simple electrical fault, any issue with a knock sensor may be an internal engine fault. 

If it is an internal engine fault, this could result in internal engine damage if you continue to drive the vehicle. 

So, if you cannot complete this repair yourself we would highly recommend going to a repair facility as soon as possible to get this issue fixed. 

Estimated Repair Cost for DTC P0325

It is advised to check the labor rates of different mechanics and compare the parts and labor costs offered by them. This way you can cut off some expenses. Also, compare your quote with other individuals in your area to confirm that you are getting the best deal.

  • Knock sensor replacement  $120-$250
  • Wiring or connector repair  $150-$350
  • PCM replacement $500-$1500

These costs vary from manufacturer to manufacturer. 

Other Codes Related to P0325

Some other codes related to the knock sensor circuit are P0328, P0330, and P0335.

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