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2016 TLX V6 9-Speed Transmission - Hesitation and Hard Shifts

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Chris P. · rep 0 · May 25, 3:40 AM · 1 replies · solved · Question

Vehicle: 2016 Acura TLX V6 SH-AWD

Hey everyone,

I've got a 2016 Acura TLX V6 with about 85,000 miles, and I've been experiencing some really frustrating transmission issues lately. Specifically, the 9-speed automatic transmission seems to hesitate when shifting from 1st to 2nd gear, and sometimes from 2nd to 3rd. It often feels like a hard, jerky shift, especially when the car is cold or in stop-and-go traffic.

It's not throwing any check engine lights, but the driving experience is definitely degraded. I've heard some things about these 9-speed transmissions. Has anyone else with a 2015-2017 TLX V6 experienced this, and what was your solution? Should I be looking at a transmission fluid flush or something more serious?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:40 AM

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ClearTheCode admin answer:

It sounds like you're describing common characteristics of the ZF 9HP 9-speed automatic transmission used in your 2016 Acura TLX V6. While often not a sign of catastrophic failure, these symptoms can be concerning and should be addressed.

Possible Causes:

  1. Software Updates: The most frequent cause of harsh or delayed shifts in these transmissions is outdated transmission control module (TCM) software. Acura has released several software updates to improve shift quality and drivability.
  2. Transmission Fluid Condition: While your mileage isn't excessively high, old or degraded transmission fluid can contribute to poor shift performance. The 9HP requires a specific ZF LifeguardFluid 9 or equivalent.
  3. Adaptive Learning: The transmission's adaptive learning process can sometimes get 'confused' or retain old driving habits. A reset of the adaptive values might help.
  4. Internal Component Wear: Less commonly, internal solenoids or clutch packs could be showing signs of wear, though this is usually accompanied by more consistent and severe symptoms or fault codes.

Recommended Steps:

  1. Check for Software Updates: This is the first and most crucial step. Visit an Acura dealership and inquire about any outstanding TCM software updates for your specific VIN. This often resolves the issue entirely.
  2. Transmission Fluid Service: If software updates don't resolve it, consider a transmission fluid drain and fill (not a flush, which can sometimes dislodge debris). Ensure the correct fluid type is used.
  3. Adaptive Learning Reset: A dealership or a specialized independent shop with the right diagnostic tools can perform an adaptive learning reset.
  4. Professional Diagnosis: If the problem persists after these steps, it's time for a professional transmission diagnosis. They can check fluid pressure, solenoid operation, and look for any internal fault codes that might not trigger a dashboard light.

When to See a Shop:

  • Immediately, if the software update and fluid service don't resolve the issue.
  • If you notice any new noises, slipping, or a complete loss of a gear.
  • If a check engine light illuminates, especially with transmission-related codes.
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