The P1326 code is a knock sensor-related error code in Hyundai and Kia vehicles that is displayed on the dashboard when the engine vibrates or the knock sensor fails. However, there can be many different reasons why the engine vibrates in a Hyundai Sonata.
In this post, we will discuss the P1326 Hyundai Sonata code in detail. Such as what is Hyundai Sonata P1326 code, its causes, and how to fix it.
What Does ”P1326 Hyundai Sonata” Mean?
The P1326 code in the Hyundai Sonata indicates a problem with the engine knock sensor or a problem in the engine. This code is triggered by the vehicle’s ECM when the knock sensor detects abnormal vibrations in the engine.
The knock sensor detection system (KSDS) monitors vibrations that may indicate the early stages of excessive connecting rod bearing wear.
If the vibration is caused by wear in the connecting rod bearings, the system will trigger the P1326 code, which is a diagnostic trouble code (DTC) specific to the KSDS in the Hyundai Sonata. In many cases, the P1326 code can also appear due to a malfunction in the knock sensor or a problem with the wiring related to the sensor.
Causes of P1326 Hyundai Sonata code
The P1326 code in the Hyundai Sonata can be caused by a knock sensor malfunction, electrical or wiring problems, faulty ECM, software glitches, or engine malfunction. Let’s take a closer look at all the reasons why this code can appear.
#1. Faulty Knock Sensor
In most cases, the reason for the P1326 code appearing in the Hyundai Sonata may be a failed or damaged knock sensor, which may prevent it from detecting engine knock and sending the proper signal to the ECM/PCM. Therefore, the knock sensor must be checked, and if the P1326 code is displayed, the bad or damaged knock sensor must be replaced.
#2. Wiring or Connector Problems
The cause of the P1326 code in the Hyundai Sonata may be damaged or worn wiring or connectors in the sensor circuit, causing a poor connection or short circuit. A bad knocking sensor causes the vehicle’s ECM/PCM to receive signals about engine knocking and detonation conditions, which it is unable to respond to and may result in poor engine fuel combustion.
#3. Faulty ECM
If the Hyundai Sonata’s ECM/PCM has failed, it may be unable to properly receive and interpret signals from the knocking sensor, causing the P1326 code to appear in the Hyundai Sonata.
In many cases, the ECM/PCM encounters some sort of error or the ECM memory is reset, causing the vehicle’s ECM/PCM to not be able to correctly read the signals received by the sensor.
#4. Engine Mechanical Problems
The P1326 code in the Hyundai Sonata can also be triggered by mechanical problems in the engine, such as worn engine bearings or damaged pistons, which are causing excessive engine knocking.
Therefore, unnecessary loud noises coming from the engine can also affect the functioning of the knocking sensor, and the knocking sensor signals the loud engine noise to the vehicle’s ECM, which can cause code P1326 in the Hyundai Sonata.
#5. Fuel Quality Problems
Sometimes, low-quality fuel or fuel contaminated with water or other impurities in the Hyundai Sonata can cause knocking in the engine, which can trigger the P1326 code.
Since low-quality fuel can cause excessive knocking during fuel explosion in the engine’s combustion chamber, and cause misfires and vibrations in the engine. The knocking sensor detects engine knocking and signals the vehicle’s ECM/PCM, causing the ECM to trigger this trouble code.
Symptoms of the P1326 Hyundai Sonata code
The P1326 code in the Hyundai Sonata is a fault code for the knock sensor circuit, which can affect the power performance of the engine in the Hyundai Sonata and ignoring this code in the long run can cause engine damage.
Bad Engine Ignition Timing: The knock sensor is responsible for detecting engine knock or detonation and sending a signal to the ECM to adjust the ignition timing accordingly. If the knock sensor circuit is faulty, the ECM may not be able to properly adjust the ignition timing.
Reduced Performance: A bad or failed knock sensor in the Hyundai Sonata can lead to reduced engine performance, including reduced power, acceleration and fuel efficiency as well as increased fuel consumption.
Rough Idle: In the Hyundai Sonata, if the knocking sensor fails or the ignition timing is not adjusted properly, the engine may experience rough idling, stalling, or hesitation. The bad knocking sensor is not able to signal the engine knocking and detonation condition to the vehicle’s ECM/PCM. The problem with the P1326 code in the Hyundai Sonata is often caused by the engine idle RPM needle going up/down.
Engine Damage: Ignoring the P1326 code in the Hyundai Sonata or any other vehicle can cause engine damage over time, as excessive knocking or detonation without proper adjustment of the engine’s ignition timing damages the engine’s internal parts and can sometimes even cause wear and tear on the engine’s internal parts. Improper ignition timing of the engine can badly affect the engine’s pistons and head valves.
Check Engine light Illuminated: Often, a problem with the P1326 code in a Hyundai Sonata or any other vehicle can cause the check engine light to come on in the vehicle’s cluster meter. However, there can be many reasons behind the light coming on on the dashboard of a Hyundai Sonata or any other vehicle. For this, you should first scan the system with an OBD scanner.
Diagnosing and Fixing P1326 Code in Hyundai Sonata
First of all, to fix the P1326 code in Hyundai Sonata you should check its causes. For this, you should inspect and diagnose the engine knock sensor and the associated wiring. If the knock sensor is bad or there is a problem with the wiring, you will have to replace the knock sensor or repair the wiring.
But in many cases, the P1326 code in Hyundai Sonata can also be caused by a faulty engine control module. In these cases, the P1326 code can also be fixed by updating the software of the engine control module. An OBD-II scanner can help you determine what is causing the P1326 code to occur, which will guide you through the troubleshooting process.
If your Hyundai Sonata displays the P1326 code, it is necessary to perform a thorough diagnosis to identify the root cause.
#1. Scan The Vehicle for Diagnostic Trouble Codes (DTCs)
Use a compatible OBD-II scanner to read the P1326 code.
Record any other associated codes that appear along with P1326, as these may provide additional information about the problem.
#2. Check The Knock Sensor
The P1326 code is usually associated with a bad knock sensor.
Check for any visible signs of damage, wear, or corrosion in the knock sensor.
Test the resistance of the knock sensor using a multimeter to make sure it is working correctly.
#3. Inspect The Wiring and Connectors
Check the wiring connected to the knock sensor for any damage, wear, or loose connections.
Check for corrosion or poor contact in the connectors.
Use a multimeter to check voltage and continuity in the sensor circuits.
#4. Verify ECM Functionality
Check for any signs of malfunction or damage to the ECM/PCM.
Perform a visual inspection for burned components or loose connections.
Use diagnostic software to test the ECM’s ability to communicate and receive signals from the knock sensor.
#5. Inspect The Engine’s Mechanical Components
Listen for abnormal knocking sounds coming from the engine, which may indicate mechanical problems.
Check for worn engine bearings or damaged pistons that may cause excessive knocking.
#6. Review Fuel Quality
Inspect the quality of the fuel used in the vehicle. Poor quality fuel may cause engine knocking.
Check for water contamination or impurities in the fuel.
#7. Clear The Code and Test Drive
After fixing the problem, clear the P1326 code using an OBD-II scanner.
Test drive the vehicle to make sure the problem is resolved and the code does not return.
The top fixes for the P1326 code in Hyundai Sonata are:
Knock sensor replacement
Knock sensor wiring repair
Engine control module update
Engine replacement or rebuild as needed
Cost To fix P1326 in Hyundai Sonata
The cost of troubleshooting the P1326 code in Hyundai Sonata depends on its cause. There are many reasons why the P1326 code may appear.
If the knock sensor in your Hyundai Sonata is bad, you may have to pay $120 to $400 for it. But expect to pay $2500 to $7000 for a seized engine including replacement parts and mechanic labor costs. However, you can get the ECM software upgraded for free from any Hyundai or Kia dealership.
Frequently Asked Questions
Is P1326 a recall For Hyundai Sonata?
Yes, in many cases of the P1326 code, there has been a recall by Hyundai for several vehicles. On Hyundai and Kia vehicles, the harness will be replaced under warranty, and ECM software upgrades were provided free of charge.
Can you drive with code P1326?
No, it is not recommended to drive with the P1326 code without checking the code. Because this code indicates a problem with your vehicle’s engine.
