P1326 Code: Causes, Symptoms and Diagnosis

The P1326 code indicates an issue with the Knock Sensor Detection System (KSDS) of your vehicle. Learn everything you need to about the P1326 meaning, symptoms and causes.

P1326 Code

The latest cars have a Knock Sensor Detection System. The Knock Sensor Detection System constantly detects the vibrations and sounds coming from the engine. When the engine control module (ECM) of your car monitors an issue with the knock sensor detection system, it activates the P1326 code.

This article describes the P1326 code meaning, symptoms, causes, and how to fix it.

Code P1326 Definition

P1326 code – Knock Sensor Detection System (Hyundai/ Kia)

What Does the P1326 Code Mean?

The Engine Control Module (ECM) of your car triggers the P1326 code when it detects that your vehicle’s Knock Sensor Detection System (KSDS) monitors abnormal vibration.

Knock Sensor Error Code

Specifically found in Hyundai and Kia cars, the P1326 is a manufacturer-specific code.

The primary function of the Knock Sensor Detection System is to monitor engine vibrations meticulously, acting as a preventative measure against any potential excessive wear to the connecting rod bearing. By proactively detecting irregular vibrations, this system effectively safeguards the engine from wear and tear before it can occur.

Causes of Error Code P1326

A faulty knock sensor is one of the most frequent causes of the P1326 code. It may also be triggered due to damaged wiring associated with the knock sensor, making them the most common culprits. Nevertheless, in numerous Hyundai and Kia cars, the P1326 error code may also result from a software error within the KSDS system, necessitating a software update.

It’s essential to promptly diagnose the issues leading to the P1326 trouble code, as they can range from minor to major.

The following are the major causes of the P1326 trouble code:

  • Faulty knock sensor
  • Damaged wiring or loose connections connected to the knock sensor
  • The software of the ECM requires an update
  • Main engine failure (such as seized engine or rod knock)

Symptoms Of P1326 Code

  • Illuminated check engine light on your car dashboard
  • Engine stalling
  • Reduced engine power
  • Poor acceleration
  • Limp mode activation
  • Rough idle
  • Engine starting issue

How to Diagnose the P1326 Error Code?

The diagnostic trouble code (DTC) P1326 is considered a serious trouble code. When your ECM triggers this error code, you should immediately diagnose it and fix the main issue. Follow the below-given steps to diagnose the P1326 code:

  • Connect an OBD2 scan tool to your vehicle’s ECM to confirm the existence of the P1326.
  • If the code is detected, clear all the trouble codes stored in the ECM memory. If the P1326 code reappears after clearing, proceed for a deep inspection.
  • Thoroughly examine the harness of the sensor for any potential short circuits or open circuits.
  • Inspect the connections and wiring connected to the knock sensor for damage or looseness.
  • Turn the ignition key in the ON position to examine if the engine starts or not. Once the check is complete, switch OFF the key.
  • Conduct a comprehensive examination of the knock sensor for any physical damage or malfunction.
  • If engine misfiring is also observed, carefully examine the spark plugs and ignition coils.
  • Verify the current software version of the ECM and upgrade it if required to address any potential software-related issues.

If the above-discussed solutions do not resolve the issue, it is advisable to seek assistance from a certified technician. They possess the expertise to diagnose the problem accurately. While there are chances that the engine might have encountered a significant issue, such problems usually come with additional fault codes and accompanying symptoms.

Read More: Bad ECM Symptoms and Causes

P1326 Code Diagnostic Mistakes

Many drivers or mechanics can make the following mistakes while diagnosing the P1326 code:

  • Drawing conclusions about the problem based on information gathered from different codes.
  • Failing to replace components that have worn out or become dirty leads to the issue.
  • Making unwarranted assumptions that the scanning method is infallible and always yields 100% accuracy.
  • Neglecting to check for other possible Diagnostic Trouble Codes (DTCs) that may be contributing to the P1326 code.
  • Wrong attributing a symptom to a specific cause without thorough verification.
  • Not adhering to appropriate repair measures, such as using recommended lubricants, cleaners, and fluids when working with automotive components.

What repairs can fix the P1326 Code?

You can fix the P1326 code by performing one or more of the below-given repairs:

  • Change the bad knock sensor
  • Repair the damaged or opened sensor harness
  • Update the ECM software
  • Replace or repair the damaged or loose electrical connections and wires connected to the knock sensor

How Much Does It Cost To Fix Code P1326?

If the bad ECM software of the Hyundai or KIA is the cause of the P1326 code, the good news is that you can upgrade it for free at the dealer. The fixing cost of the P1326 varies according to the type and amount of the faulty parts and labor as labor time.

The following list describes the repair cost of the P1326 code depending on the relevant faulty part:  

Knock sensor connections repairing$40 to $560
ECM software update$0 to $460
Knock sensor replacement$140 to $470
Engine rebuilt$1,400 to $10,000


What is the function of the knock sensor?

The knock sensor is used to monitor the knocking sound coming from the engine, convert it into electrical signals and delivers that signal to the engine control module (ECM).

What does P1326 mean on a Hyundai Sonata?

The Hyundai Sonata P1326 code indicates that your ECM monitors that the   Knock Sensor Detection System observes an unusual vibration.

How to clear the P1326 code?

Before attempting to clear the P1326 code, it is essential to identify and resolve its root cause. Once the issue has been repaired, you can use a scan tool compatible with your car to clear the codes. Remember, it is crucial to address the underlying problem before attempting to clear the codes.

How serious is the P1326 Code?

The P1326 code is classified as a severe issue, leading to various performance problems such as entering the limp mode, engine stalling, poor fuel economy, or poor idle. It is crucial to address this code promptly to prevent potential engine issues.

Can I drive with code P1326 code?

Avoid driving with the error code P1326 without addressing its cause, as neglecting it may lead to severe consequences, including potential engine failure. Therefore, it is important to address the issue before driving further.

What is a Limp Mode?

Limp mode, also known as limp home mode, is a security feature in vehicles which activates when a critical issue is detected. It is triggered by the engine control module or powertrain control module. When this mode is activated, it limits the speed of your car and deactivates less important parts like the air conditioning.

Is the P1326 code a recall?

The fault code P1326 is frequently subject to a recall for both Hyundai and Kia models. For Kia vehicles, the remedy usually involves a simple software update, while certain Hyundai models may need the harness replacement. In some instances, the code might indicate a more serious problem, such as a complete engine bearing failure. It is recommended to contact your dealer to obtain more detailed information regarding the specific recall and the appropriate steps to address the issue. 

Can P1326 code clear itself?

In maximum cars, resolving the issues that triggered the P1326 code will automatically clear the code when you drive. However, it is crucial not to expect the code to disappear without addressing the underlying issues. Overlooking the DTC P1326 for a long time may ultimately result in the complete failure of your engine. Therefore, it is vital to promptly diagnose and rectify the issue to ensure the vehicle’s proper functioning and safety.

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