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2018 Santa Fe Sport 2.0T Transmission Jerking/Hard Shifts

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

Vehicle: 2018 Hyundai Santa Fe Sport 2.0T

Hi all,

I'm experiencing a worrying issue with my 2018 Hyundai Santa Fe Sport 2.0T. Lately, the transmission has started to feel really rough. It's most noticeable when accelerating from a stop – there's a distinct jerk or clunk as it shifts into gear. Sometimes, there's a noticeable delay before it engages.

It's also happening during downshifts, feeling less smooth than it used to be. There are no warning lights on the dash, but the problem seems to be getting progressively worse. I'm concerned this could be a major transmission problem.

Has anyone else with a similar Santa Fe experienced this? What could be causing it?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Transmission jerking and hard shifts are definitely concerning, especially in a relatively new vehicle. Here are some common causes for these symptoms in your 2018 Santa Fe Sport 2.0T:

  1. Low or Contaminated Transmission Fluid: This is often the simplest cause. Low fluid levels can prevent proper hydraulic pressure, leading to erratic shifts. Contaminated or old fluid can lose its lubricating and cooling properties.
  2. Software Issues: The Transmission Control Module (TCM) relies on software to manage shift points and pressures. Sometimes, a software glitch or an outdated calibration can cause shifting problems. Hyundai often releases updates to address these.
  3. Solenoid Problems: Solenoids within the transmission control the flow of fluid to engage different gears. If a solenoid is sticking or failing, it can cause harsh or delayed shifts.
  4. Internal Wear: While less likely in a 2018 model, wear in clutch packs, valve bodies, or other internal components can eventually lead to these symptoms.

What to do:

  • Check Transmission Fluid: If your vehicle has a dipstick, check the transmission fluid level and condition according to your owner's manual. Note if it looks dark or smells burnt. Many modern transmissions are sealed, requiring a shop to check.
  • Recall/TSB Check: Research if there are any active recalls or Technical Service Bulletins (TSBs) related to transmission issues for your specific model year.

When to see a shop:

Given the symptoms, it's highly recommended to have your Santa Fe inspected by a Hyundai dealership or a reputable transmission specialist as soon as possible. They can perform a diagnostic scan to check for any stored transmission codes (even if no check engine light is on), inspect the fluid, and check for available software updates. Addressing this early can prevent more extensive and costly transmission damage.

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