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2018 Sonata 2.4L GDI - Engine Knocking Noise and Oil Consumption

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Mike T. · rep 0 · May 22, 2:59 AM · 1 replies · solved · Question

My 2018 Hyundai Sonata SE, with the 2.4L GDI engine, has developed a concerning knocking noise, especially noticeable during acceleration. It sounds like it's coming from the bottom end.

I've also noticed I'm going through oil much faster than I used to. I have to top it off every few weeks, which wasn't the case before. The check engine light came on briefly a couple of times but then went off.

I'm worried this could be a serious engine issue. Has anyone else experienced this with their Sonata? What should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:59 AM

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ClearTheCode guidance (Hyundai · Engine & drivetrain)

Summary: For 2018 Sonata 2.4L GDI - Engine Knocking Noise and Oil Consumption, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: My 2018 Hyundai Sonata SE, with the 2.4L GDI engine, has developed a concerning knocking noise, especially noticeable during acceleration. It sounds like it's coming from the bottom end.

I've also noticed I'm going through oil much faster than I used to. I have to top it off every few weeks, which wasn't the case before. The check engine light came on briefly a couple of times but then went off. …

This is educational guidance, not a substitute for hands-on diagnosis.

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