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2019 G70 3.3T Rough Idle and Misfire - CEL On

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Mike T. · rep 0 · May 22, 6:16 AM · 1 replies · solved · Question

Hey everyone,

I've been experiencing some frustrating issues with my 2019 Genesis G70 3.3T Sport lately. For the past week or so, the car has developed a noticeable rough idle, especially when cold or at stoplights. It feels like a slight shudder through the car.

Yesterday, the check engine light came on and stayed on. I also noticed a slight hesitation and what felt like an occasional misfire under light acceleration. It's not constant, but definitely concerning. I haven't noticed any significant loss of power, but the overall smoothness isn't what it used to be.

Has anyone else with a G70 3.3T experienced something similar? Any ideas on what might be causing this? I'm trying to gather some info before I take it to the dealership.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:16 AM

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ClearTheCode guidance (Genesis · Engine & drivetrain)

Summary: For 2019 G70 3.3T Rough Idle and Misfire - CEL On, 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: Hey everyone,

I've been experiencing some frustrating issues with my 2019 Genesis G70 3.3T Sport lately. For the past week or so, the car has developed a noticeable rough idle, especially when cold or at stoplights. It feels like a slight shudder through the car.

Yesterday, the check engine light came on and stayed on. I also noticed a slight hesitation and what felt like an occasional misfire u…

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

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