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2018 TLX V6 A-Spec - Rough Shifts and Hesitation from 9-Speed Transmission

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Chris P. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2018 Acura TLX V6 A-Spec

Hey everyone,

I've got a 2018 Acura TLX V6 A-Spec with about 65,000 miles, and lately, the 9-speed automatic transmission has been acting up. I'm experiencing noticeable hesitation, especially when accelerating from a stop or at low speeds. It often feels like it's searching for the right gear, and the shifts themselves can be quite rough, particularly between 2nd and 3rd gear.

It's not throwing any check engine lights, but the driving experience is definitely degraded. I've heard some chatter online about these ZF 9-speed transmissions having issues. Is this a known problem for this model year and trim? What should I be looking into?

I'm trying to figure out if this is something I can address with a software update, a fluid change, or if it's a more serious mechanical issue. Any advice from other 2016-2020 TLX owners would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:02 AM

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ClearTheCode admin answer:

It sounds like you're describing a common characteristic, and sometimes a developing issue, with the ZF 9-speed automatic transmission found in your 2018 Acura TLX V6. While these transmissions are known for their wide gear ratio spread, some owners do report rough shifting, hesitation, and clunking, particularly at lower speeds or during specific gear changes.

Here's what you should investigate:

  1. Check for Technical Service Bulletins (TSBs): Acura has released several TSBs related to the 9-speed transmission for various model years, often addressing shifting quality with software updates. Your local Acura dealership can check if there are any outstanding TSBs or software updates applicable to your specific VIN. This is often the first and most effective step.
  2. Transmission Fluid Condition: While not always the primary cause for these specific symptoms without a fault code, ensuring the transmission fluid is at the correct level and in good condition is crucial. The ZF 9HP transmission uses a specific fluid (ZF LifeguardFluid 9 or equivalent). If the fluid is old, contaminated, or low, it can contribute to shifting issues. A 'drain and fill' service might be beneficial if the fluid hasn't been changed according to the maintenance schedule.
  3. Adaptive Learning Reset: Sometimes, the transmission's adaptive learning parameters can become skewed. A dealership or a shop with advanced diagnostic tools can perform a transmission adaptive learning reset, which allows the transmission to 're-learn' your driving style and potentially smooth out shifts.
  4. Solenoid or Valve Body Issues: In more severe or persistent cases, internal components like solenoids within the valve body can begin to fail, leading to inconsistent fluid pressure and rough shifts. This is less common without a diagnostic trouble code but is a possibility if other solutions fail.

When to see a shop:

  • Immediately if you experience any new warning lights (e.g., Check Engine Light, Transmission System Warning). While you mentioned no lights, a P0700 (Transmission Control System Malfunction) or other P07xx series codes would indicate a specific fault.
  • If checking for TSBs and performing a transmission fluid service (if due) does not resolve the issue.
  • If the hesitation or rough shifts worsen significantly, or if you hear any new grinding or clunking noises. Continued severe symptoms could indicate internal wear that needs professional attention to prevent further damage.
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