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Rough Shifting & Hesitation in my 2017 Acura TLX V6 - Transmission Concerns

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Jennifer H. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Vehicle: 2017 Acura TLX V6

Hey everyone,

I've been experiencing some really rough shifting and hesitation with my 2017 Acura TLX V6, specifically the 9-speed automatic transmission. It's most noticeable during low-speed driving, like in stop-and-go traffic, and sometimes when downshifting from higher gears.

There's often a noticeable lurch or delay when accelerating from a stop, and sometimes a harsh clunk when shifting into lower gears. It feels like the transmission is struggling to find the right gear.

Has anyone else with a 2016-2019 TLX V6 experienced similar issues? I'm wondering if there are any known TSBs (Technical Service Bulletins) or recalls related to this. Is this something a software update can fix, or should I be preparing for a more significant repair? Any advice on what to tell the dealership would be greatly appreciated.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:00 AM

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ClearTheCode admin answer:

It sounds like you're describing common characteristics of the ZF 9-speed automatic transmission found in many 2015-2020 Acura TLX V6 and MDX models. This transmission has been known to exhibit rough shifting, hesitation, and occasional lurching, particularly at lower speeds or during specific gear changes.

Here's what you should consider:

  1. Software Updates: The most common initial fix for these symptoms is a transmission software update. Acura has released multiple TSBs (Technical Service Bulletins) over the years to address shifting logic and improve overall drivability. These updates aim to refine the transmission's adaptive learning process.
  2. Transmission Fluid Service: While less common for early issues, ensuring the transmission fluid is at the correct level and in good condition is crucial. Some owners have reported improvements after a transmission fluid drain and fill, especially if the fluid is old or contaminated.
  3. Adaptive Learning Reset: After a software update or fluid change, the transmission's adaptive learning values may need to be reset. This allows the transmission to "re-learn" your driving style and optimize shift points.
  4. Causes: The primary cause is often related to the complex electronic control unit (ECU) programming and the mechanical tolerances of the 9-speed unit itself. It's not necessarily a sign of imminent failure but rather a characteristic that Acura has tried to refine through software.
  5. When to See a Shop: You should definitely schedule an appointment with an authorized Acura dealership. Explain your symptoms clearly and specifically ask them to check for any outstanding TSBs related to the transmission software for your 2017 TLX V6. They will have the specialized diagnostic tools to check for codes (though rough shifting might not always trigger a specific OBD-II code unless it's severe) and perform the necessary updates. If software updates don't resolve the issue, they may investigate further into mechanical components, but this is less common for the initial symptoms you've described.

It's important to address this, as consistent harsh shifting can put undue stress on transmission components over time.

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