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2020 Kia Forte GT-Line CVT Hesitation and Rough Shifting

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Sarah K. · rep 0 · May 22, 3:12 AM · 1 replies · solved · Question

Vehicle: 2020 Kia Forte GT-Line

My 2020 Kia Forte GT-Line, with the IVT (Intelligent Variable Transmission), has been acting a bit strange lately. When I'm accelerating from a stop, especially in stop-and-go traffic, there's a noticeable hesitation before it really gets going. It feels like it's struggling to find the right 'gear' or ratio.

Sometimes, it also feels like it's 'lurching' or shifting roughly, which I thought wasn't supposed to happen with a CVT. It's not consistent, but it's frequent enough to be annoying and make me wonder if something is wrong with the transmission.

Is this normal behavior for Kia's IVT, or should I be concerned? What should I ask my mechanic to look for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:12 AM

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ClearTheCode admin answer:

It's understandable to be concerned when your vehicle's transmission isn't performing as expected, especially with a newer technology like an IVT (Kia's term for CVT). While CVTs are designed for smooth, stepless acceleration, some characteristics can be misinterpreted, or genuine issues can arise.

  1. Normal CVT Characteristics: CVTs can sometimes feel different from traditional automatics. A slight 'rubber band' effect or a momentary delay in power delivery when accelerating hard from a stop can be normal as the transmission adjusts its ratio. However, a distinct 'lurching' or rough 'shifting' (which shouldn't occur in a true CVT) is not typical.

  2. Potential Causes for Hesitation/Roughness:

    • Low or Contaminated Transmission Fluid: Incorrect fluid levels or degraded fluid can significantly impact CVT performance. CVTs require specific fluid types.
    • Software Glitch: The transmission control module (TCM) might have a software issue or require an update to optimize shift logic and responsiveness.
    • Belt/Pulley Wear: While less common in newer vehicles, wear in the CVT's belt or pulley system can cause hesitation or slipping.
    • Sensor Malfunction: Sensors that monitor vehicle speed, engine RPM, or transmission fluid pressure can send incorrect data to the TCM, leading to erratic behavior.

When to See a Shop:

  • If the hesitation is pronounced, consistent, or accompanied by unusual noises, it's time for a professional diagnosis.
  • Visit a Kia dealership or a reputable transmission specialist.
  • Request a diagnostic scan for any stored transmission-related trouble codes (e.g., P0700 series codes).
  • Ask them to check the transmission fluid level and condition, and inquire about any available software updates for the TCM.
  • Describe the symptoms precisely, noting when they occur (e.g., cold start, specific speeds, heavy acceleration).
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