The Check Engine Light (CEL) on your car isn’t always a sign of impending doom, but you should never assume the issue is minor. In the case of error code P1326 being triggered by your vehicle’s diagnostic system, applicable to Hyundai and Kia models exclusively, you definitely don’t want to put off seeing your mechanic.
P1326 relates to a fault with the Knock Sensor Detection System (KSDS), an engine monitoring technology that can detect excessive bearing wear.
The issue has been prevalent enough for Hyundai to recall some vehicles, while dealers were instructed to replace engines outright or update software. Here’s everything you need to know about the P1326 error code.
What Does the P1326 Code Mean?
P1326 code stands for “Knock Sensor Detection System (Kia/Hyundai).”
The P1326 code indicates that the powertrain control module (PCM) of your vehicle detects that the signal coming out of the KSDS (Knock Sensor Detection System) determines the vibrations occurring are unusual.
The Knock Sensor Detection System (KSDS) is a new engine monitoring technology. The Knock Sensor Detection System monitors vibration to ensure connecting rod bearings are not subject to extreme wear. This system is mainly designed to avoid engine wear.
This system of your vehicle alerts you about an early stage of bearing wear, as serious engine damage or failure can occur. Constant vibrations due to functional wear cause the MIL (Malfunction Indicator Lamp) to illuminate continuously. The illuminated MIL alerts the driver about a problem.
Symptoms of P1326 Code
- Check engine light is flashing
- A reduction in the engine power
- Rough idle
- Halting performance
- Limp mode
- Hard to start the vehicle
- Engine stalling
Causes of P1326 Code
- Bad knock sensor
- Open or shorted harness to the knock sensor
- A motor in poor condition
- Loose connections to the knock sensor
- PCM needs reprogramming
- Corroded or faulty wires to the knock sensor
How to Diagnose the P1326 Trouble Code?
Not every vehicle is going to use the same diagnostic procedures for the P1326 trouble code. For that reason, it’s important that you follow all of the guidelines set out in the service manual for your vehicle. If you need general steps to follow, here are a few to consider.
- Erase the codes from the computer with a scan tool.
- Start the engine until the Check Engine Light comes back on. Run the code scanner once again. If you see other DTCs present, make sure you use this information in the diagnostics steps. If something indicates a problem with the same system, you may be able to figure out what’s going on easier.
- Check the software version for the engine control module. If it’s not the newest version, you need to update the software or take the vehicle to a Kia or Hyundai dealership to update it.
- Check all of the connections and wiring to the knock sensor. You want to fully inspect the wiring harness and the connections to the ECM. If you notice anything loose or damaged, fix it now.
- Inspect and measure the knock sensor’s resistance. It is usually found on the engine block beneath the intake manifold. To find the correct values, you need to check a repair manual.
If these steps haven’t helped you figure out the problem, it’s best to get some further guidance from a professional mechanic. There’s the possibility that something bad has happened to your engine, although this problem would normally come with other trouble codes and symptoms added on.
Common P1326 Code Diagnostic Mistakes
- Not replacing the parts that have failed because of overuse or dirt
- Locating the wrong cause of the problem
- Not using the freeze data of the scan tool
- Not fixing other trouble codes before fixing the P1326 code
- Replacing the knock sensor before inspecting the other parts.
- Not following proper repair procedure according to the repair manual.
How serious is the P1326 Code?
The P1326 trouble code is considered a serious trouble code. This code may generate different drivability issues, such as rough idling, engine stalling, or limp mode. If you do not fix this code immediately, it may lead to engine failure. Therefore, you should fix this trouble code as soon as possible.
What repairs can fix the P1326?
- Replacing the faulty knock sensor
- Repairing the damaged or loose electrical connections to knock the sensor circuit
- Updating or replacing the bad PCM
- Repairing the shorted or opened harness
How much does it cost to fix the P1326 Code?
If the P1326 code is caused by a bad KIA or Hyundai ECM software, you can have it upgraded for free at the dealer. If it’s caused by a faulty knock sensor, expect it to cost $150 to $450. However, a seized engine can cost over $10,000.
If you’ve done the diagnostics and you know what’s wrong, you are ready to proceed with the fix. However, you might also be wondering what it could cost you. In general, here are a few average prices with the labor and parts rates included.
- Repair connection to knock sensor circuit – $50-$550
- Replace knock sensor – $150-$450
- Update Engine Control Module (ECM) – $0-$450
- Replace/rebuilt failed engine – $1,500-$10,000
FAQs.
Can you drive with P1326 code?
It is not recommended to drive with the P3126 code. Driving with this code may produce various drivability problems, such as engine stalling or rough idling. You shouldn’t drive with this code for a long time because it may lead to the complete failure of the engine. Therefore, you must fix the main issue of this code immediately as you observe it.
Will P1326 clear itself?
In most vehicles, the engine code P1326 clears itself as you fix the main issue of this code. However, in some models, you need to clear this code through a scan tool. You shouldn’t ignore this code. Ignoring the P1326 code may lead to the complete failure of the engine.
What does the knock sensor do to the engine?
The main function of the knock sensor is to identify the high-frequency engine vibrations that lead to knocking and transmit this information to the PCM/ECM of your vehicle. The main purpose of the installation of this sensor is to get the maximum energy yield by starting the ignition as soon as possible. This sensor also helps to improve engine torque and improve fuel economy.
Can I fix the knock engine?
Yes, you can fix the engine knocking by replacing the damaged or worn bearings. Most commonly, the worn bearings lead to the engine knocking. When your bearings are worn-out, they don’t properly support the engine weight, which may lead to knocking.