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2018 Elantra CVT Hesitation and Jerking at Low Speeds

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Laura J. · rep 0 · May 22, 2:59 AM · 1 replies · solved · Question

Vehicle: 2018 Hyundai Elantra Limited

Hi all,

I own a 2018 Hyundai Elantra Limited with about 65,000 miles, and I've been experiencing some really frustrating transmission issues lately. When I'm accelerating from a stop or at very low speeds (under 20 mph), the car often hesitates before engaging, and then sometimes jerks forward quite noticeably.

It feels like the transmission is slipping or struggling to find the right ratio. I haven't seen any warning lights on the dash, but the driving experience is definitely degraded. Has anyone with a similar Elantra and its CVT experienced this? Is this a common problem, and what should I be looking at?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Your 2018 Hyundai Elantra's symptoms of hesitation and jerking at low speeds are classic indicators of potential issues with a Continuously Variable Transmission (CVT). While CVTs offer smooth operation when functioning correctly, they can develop specific problems.

Common Causes:

  1. CVT Fluid Degradation: The most common cause of CVT performance issues is old or low transmission fluid. CVT fluid is crucial for lubrication, cooling, and transmitting power via the belt and pulleys. Over time, it can break down, leading to slipping or erratic behavior.
  2. Worn Belt or Pulleys: The internal belt and pulley system in a CVT can wear out, causing slippage, hesitation, and jerking as the transmission struggles to maintain the correct ratio.
  3. Software Glitches: Sometimes, the Transmission Control Module (TCM) software can have bugs or require an update to optimize shifting logic and address performance anomalies.
  4. Torque Converter Issues: While less common in CVTs than traditional automatics, a failing torque converter can also contribute to hesitation and poor power transfer.

Diagnostics & When to See a Shop:

  1. Check for OBD Codes: Even without a check engine light, the TCM might have stored codes. Common CVT-related codes include P0700 (Transmission Control System Malfunction) or P0741 (Torque Converter Clutch Performance).
  2. CVT Fluid Inspection: A qualified technician should inspect the CVT fluid level, condition, and color. If it's dark, burnt, or low, a fluid change might be recommended.
  3. Software Update: Check if there are any available software updates for your vehicle's TCM.
  4. Transmission Diagnostic: A professional diagnostic scan can pinpoint specific sensor failures or internal component wear.

Recommendations:

  • Do not delay: CVT issues can worsen quickly. Continuing to drive with these symptoms can lead to more severe and costly damage.
  • Visit a Hyundai Dealership or Transmission Specialist: They have the specific tools and expertise to properly diagnose and service CVTs. They can perform a thorough inspection, check for technical service bulletins (TSBs) related to your model year, and recommend the appropriate repair, which could range from a fluid change and software update to internal component repair or even transmission replacement. Early diagnosis is key to potentially avoiding a full transmission replacement.
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