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Rough Shifting in 2020 ES 350 - Is this normal?

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Sarah K. · rep 0 · May 22, 4:46 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350 Luxury

Hi everyone, I recently bought a used 2020 Lexus ES 350 with about 35,000 miles on it. Overall, I love the car, but I've noticed some rough shifting, particularly between 2nd and 3rd gear, and sometimes a slight hesitation when accelerating from a stop. It's not constant, but it's noticeable enough to concern me.

It feels a bit clunky, not the smooth Lexus experience I was expecting. Is this a known issue with the 8-speed automatic transmission in the 2020 ES 350? Or could it be a sign of a bigger problem? I'm wondering if I should take it in for a transmission check.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:46 AM

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ClearTheCode admin answer:

Rough shifting in a 2020 Lexus ES 350 can be concerning, especially when you expect a smooth ride. Here's what you should know:

  1. Common Causes & TSBs:

    • Software Glitches: The 8-speed automatic transmission in some Lexus models, including the ES 350, can sometimes exhibit minor shifting irregularities due to software calibration. Lexus has released Technical Service Bulletins (TSBs) in the past for transmission control module (TCM) software updates to address harsh or delayed shifts. It's possible your vehicle hasn't received the latest update.
    • Transmission Fluid: While less common at 35,000 miles, low or degraded transmission fluid can contribute to shifting issues. However, Lexus transmissions are typically sealed and designed for long-life fluid, so this is usually not the primary cause unless there's a leak.
    • Adaptive Learning: Transmissions have adaptive learning capabilities, meaning they adjust shift points based on driving style. If the previous owner had a very different driving style, the transmission might be 're-learning' your habits, which can sometimes lead to temporary irregularities.

  2. When to See a Shop:

    • Immediate Action: You should definitely take your ES 350 to a Lexus dealership or a reputable independent shop specializing in Lexus vehicles. Describe the symptoms precisely: when it happens (specific gears, acceleration), and if it's intermittent or constant.
    • Diagnostics: They will connect to the vehicle's OBD-II port to check for any stored diagnostic trouble codes (DTCs) related to the transmission or engine. Even if the check engine light isn't on, there might be pending codes. They will also check for applicable TSBs and perform any necessary software updates for the Transmission Control Module (TCM).
    • Inspection: A physical inspection for fluid leaks or external damage is also important. If the issue persists after software updates, further mechanical diagnosis of the transmission components might be required.
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