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Hesitation and Hard Shifts in my 2020 ES 350 Transmission

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David L. · rep 0 · May 22, 4:42 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350 Luxury

Hi everyone,

I'm reaching out because I've noticed some concerning behavior with the transmission in my 2020 Lexus ES 350 Luxury. When accelerating from a stop, especially in stop-and-go traffic, there's a noticeable hesitation before the car really gets going. It feels like it's struggling to find the right gear.

Additionally, I've started experiencing some hard shifts, particularly between 2nd and 3rd gear, and sometimes downshifting. It's not constant, but it's happening frequently enough to be a concern. There's no check engine light on, which makes it even more confusing.

Has anyone with a 2019-2026 ES 350 experienced similar transmission issues? Is this something that could be fixed with a software update, or am I looking at a more serious mechanical problem? Any insights would be helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:42 AM

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Hello David,

Transmission hesitation and hard shifts on a 2020 Lexus ES 350 can be unsettling, especially without a check engine light. Here are some potential causes and steps to consider:

Common Causes:

  1. Transmission Fluid Issues: Low or degraded transmission fluid can cause shifting problems. While modern transmissions are often 'sealed for life,' fluid can still degrade or leak over time, affecting hydraulic pressure and lubrication.
  2. Software Glitch/Update: The transmission control module (TCM) relies on complex software. Sometimes, a software bug or an outdated calibration can lead to erratic shifting behavior. Lexus often releases software updates to address known transmission quirks.
  3. Solenoid Problems: Solenoids within the transmission valve body control the flow of fluid to engage different gears. A failing or sticking solenoid can cause delayed shifts or harsh engagement.
  4. Valve Body Issues: The valve body is the 'brain' of the automatic transmission, directing fluid pressure. Internal wear or blockages in the valve body can lead to inconsistent shifting.
  5. Throttle Position Sensor (TPS): A faulty TPS can send incorrect signals to the TCM, causing it to misinterpret driver input and select the wrong gear or shift at the wrong time.

When to See a Shop:

  1. Initial Check: Start by checking your transmission fluid level and condition, if accessible. However, for many newer Lexus models, this requires specialized tools and knowledge.
  2. Dealership Visit: Given the complexity of modern transmissions, a visit to a Lexus dealership is highly recommended. They can check for any pending software updates for your specific VIN and perform a thorough diagnostic scan for any hidden codes or abnormal sensor readings that might not trigger a dashboard light.
  3. Early Intervention: Addressing transmission issues early can prevent more significant and costly repairs down the line. Continuing to drive with noticeable shifting problems can exacerbate wear on internal components.
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