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P0326 OBD-II Trouble Code: Knock Sensor Range/Performance (Bank 1 or Single Sensor)

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P0326 code definition

Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

What the P0326 code means

The P0326 code means that the Engine Control Module (ECM) has detected a reference voltage from the knock sensor that has fallen outside the threshold of acceptance set by the manufacturer.

The knock sensor’s job is to inform the ECM of any abnormal engine noises that may be occurring, such as spark knock.

What are the causes of the P0326 code?

This code is sometimes accompanied by other codes, and it is important to address these other issues first. If no other engine issues exist but a P0326 code is still present, some potential causes of the P0326 code may include:

  • Damaged wiring or connectors associated with the knock sensor
  • A faulty knock sensor
  • A connector that has come unplugged
  • A faulty ECM

What are the symptoms of the P0326 code?

  • Loss of power
  • Hesitation upon acceleration
  • Spark knock
  • Check Engine Light illumination
  • Abnormal engine noise

How does a mechanic diagnose the P0326 code?

If this code is accompanied by any other trouble codes, the mechanic would resolve those issues first. If no other issues exist, the mechanic would visually inspect the knock sensor to ensure that it is plugged in, the wiring is not damaged, and that is is functioning properly.

To ensure the functionality of the knock sensor, the mechanic may test it with a digital multimeter using the manufacturer’s recommended procedure. If any issues are found during this test, the faulty parts would be replaced at the customer’s request.

If no issues were found, the ECM would be tested next and replaced if necessary.

Common mistakes when diagnosing the P0326 code

This is a code where it is easy to misdiagnose the problem due to the fact that a particular part is mentioned in the trouble code itself. If this code is stored in your vehicle, do not just replace the knock sensor. Ensure that the sensor is malfunctioning before replacing it.

How serious is the P0326 code?

If other codes are associated with this code, it can be more serious than if this code were set by itself. The other codes that may cause this code to pop up can cause very serious drivability issues and may cause the engine not to run at all. If the P0326 code is stored by itself, it is likely that the driver can drive on it for a short time before having the issue resolved.

What repairs can fix the P0326 code?

  • Replacing the knock sensor
  • Repairing or replacing any wiring or connectors that are associated with the knock sensor.
  • Plugging the knock sensor back in
  • Replacing the Engine Control Module

Additional comments regarding the P0326 code?

Spark knock can be very loud and is usually immediately noticeable to the driver. If the engine in your vehicle starts to sound abnormal while it is running, be sure to have the issue resolved as soon as possible to prevent any further engine damage.

Need help with a P0326 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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