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2017 Sonata 2.4L Engine Knocking and P1326 Code

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Mike T. · rep 0 · May 25, 2:00 AM · 1 replies · solved · Question

Vehicle: 2017 Hyundai Sonata SE

Hey everyone,

I'm having a serious issue with my 2017 Hyundai Sonata SE, 2.4L engine. Recently, I've noticed a distinct knocking sound coming from the engine, especially when accelerating. It sounds pretty bad and has me worried.

To make matters worse, the check engine light came on, and when I scanned it, I got a P1326 code. I've read a bit online, and it seems like this is a known problem with these engines. Has anyone else experienced this with their Sonata? What was your fix?

The car has about 95,000 miles on it, and I've tried to keep up with regular oil changes. Any advice on what I should do next would be greatly appreciated. I'm hoping it's not a total engine replacement.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:00 AM

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ClearTheCode admin answer:

The P1326 code, often referred to as the 'Knock Sensor Detection System' code, is a critical diagnostic trouble code (DTC) for certain Hyundai and Kia vehicles, particularly those equipped with the Theta II GDI engine. This code indicates that the Engine Control Module (ECM) has detected an abnormal vibration pattern that suggests potential connecting rod bearing wear or other severe internal engine damage. This is a very serious issue that requires immediate attention.

Here's what you need to know and do:

  1. Stop Driving Immediately: If your check engine light is flashing or the P1326 code is present with a noticeable knocking sound, it is highly recommended to stop driving the vehicle as soon as it is safe to do so. Continuing to drive can lead to catastrophic engine failure.
  2. Understanding the Cause: The P1326 code is often a precursor to engine seizure or severe internal damage, frequently linked to manufacturing defects in the connecting rod bearings. Hyundai has extended warranties and initiated recalls for many vehicles affected by this issue.
  3. Diagnostics: A qualified technician will need to perform a thorough inspection, which may include:
    • Listening to the engine with a stethoscope to pinpoint the knocking source.
    • Checking oil pressure.
    • Potentially dropping the oil pan to inspect for metal shavings.
    • Using specialized diagnostic tools to analyze engine vibration patterns.
  4. When to See a Shop: You should arrange for your vehicle to be towed to a Hyundai dealership or a trusted independent repair shop specializing in Hyundai vehicles immediately. Do not attempt to diagnose or repair this yourself, as it involves internal engine components.
  5. Warranty and Recall Check: Provide your VIN to the dealership. They can check if your vehicle is covered under any extended warranties or recalls related to the Theta II engine issues. Many owners have had their engines replaced under these programs.

Ignoring this code and the knocking sound can result in complete engine failure, which is a significantly more expensive repair than addressing it promptly.

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