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Rough Shifting on my Santa Fe - Time for a Transmission Fluid Change?

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Mike T. · rep 0 · May 25, 2:04 AM · 1 replies · solved · Question

Vehicle: 2019 Hyundai Santa Fe Ultimate

Hey everyone, I've got a 2019 Hyundai Santa Fe Ultimate with about 75,000 miles on it. Lately, I've noticed the transmission feels a bit rough, especially when shifting from 2nd to 3rd, and sometimes it hesitates a little when accelerating from a stop. It's not a huge jerk, but definitely noticeable and not as smooth as it used to be.

I'm wondering if it's time to consider a transmission fluid change. I looked through my service records, and it hasn't been done yet. Is this something that's generally recommended for these cars around this mileage? What kind of fluid does it take, and is it a DIY job or something best left to a professional shop?

Any advice or personal experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:04 AM

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ClearTheCode admin answer:

It's a good observation that your 2019 Hyundai Santa Fe Ultimate is experiencing rough shifting around 75,000 miles, as transmission fluid can indeed be a factor. Here's what you should know:

  1. Causes of Rough Shifting:

    • Degraded Transmission Fluid: Over time, transmission fluid loses its lubricating properties and can accumulate metallic particles, leading to increased friction and rougher shifts.
    • Low Fluid Level: A low fluid level can cause pressure issues within the transmission, leading to hesitation and poor shifting.
    • Transmission Solenoid Issues: Less commonly, a failing shift solenoid could be the culprit, though often this triggers a Check Engine Light.
    • Internal Transmission Wear: In some cases, wear within the transmission itself can cause these symptoms.

  2. Transmission Fluid Recommendation:

    • For your 2019 Santa Fe, Hyundai typically specifies SP-IV or SP-IV RR (Reduced Viscosity) automatic transmission fluid. It's crucial to use the correct type. Check your owner's manual for the exact specification. Using the wrong fluid can cause significant transmission damage.

  3. Service Interval:

    • Hyundai's recommended service intervals for transmission fluid can vary based on driving conditions. For 'normal' driving, some manuals suggest inspection at 60,000-100,000 miles, with replacement only if necessary. For 'severe' driving conditions (e.g., heavy towing, frequent stop-and-go, mountainous terrain), replacement might be recommended as early as 60,000 miles. Given your mileage and symptoms, a fluid inspection and potential change are warranted.

  4. DIY vs. Professional:

    • DIY: A simple 'drain and fill' can be done by a skilled DIYer, but it only replaces a portion of the fluid.
    • Professional: A full transmission fluid flush or exchange is generally recommended to replace nearly all the old fluid. This typically requires specialized equipment to cycle new fluid through the system while removing the old. Given the complexity and the importance of using the correct fluid and procedure, this is often best left to a professional mechanic or a Hyundai dealership. They can also inspect for any other underlying issues.

When to See a Shop: If the rough shifting persists after a fluid change, or if you notice any new noises, slipping, or a Check Engine Light (which might indicate a P07XX series transmission code), it's imperative to have a qualified technician diagnose the issue immediately to prevent further damage.

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