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2018 Acura TLX V6 9-Speed Transmission Rough Shifting & Hesitation

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Mark S. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2018 Acura TLX V6 Advance

Hey everyone,

I'm experiencing some concerning issues with the 9-speed automatic transmission in my 2018 Acura TLX V6 Advance. It's got around 65,000 miles on it, and lately, the shifts have become noticeably rough, especially when going from 2nd to 3rd gear. Sometimes, there's a noticeable hesitation before it engages a gear, which feels really unsettling.

I've heard some chatter online about these ZF 9-speed transmissions having quirks. Is this a common reliability problem for the 2018 TLX? I'm trying to figure out if this is just normal behavior for this transmission or if I should be seriously worried about a potential failure.

Has anyone else with a similar model year TLX experienced this? What steps did you take, and what was the outcome? I'm hoping it's something simple like a software update, but I'm preparing for the worst.

✓ 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 common characteristics of the ZF 9HP 9-speed automatic transmission, which was used in various Acura models, including your 2018 TLX V6. While designed for efficiency, some owners have reported issues with rough shifting, hesitation, and occasional clunking, particularly in earlier model years.

Here's what you should know and what steps to consider:

  1. Software Updates (TSBs): Acura has released several Technical Service Bulletins (TSBs) over the years addressing transmission shifting quality for the 9-speed unit. These TSBs often involve software recalibrations designed to smooth out shifts and improve overall drivability. It's highly recommended to check if your vehicle has any outstanding TSBs related to the transmission control module (TCM) software. A dealership can check this using your VIN.

  2. Transmission Fluid Condition: The condition of your transmission fluid is crucial. While Acura specifies a long service interval, severe driving conditions can accelerate fluid degradation. Old or contaminated fluid can contribute to rough shifting. A transmission fluid drain and fill (using genuine Acura DW-1 fluid) might help, especially if it hasn't been done recently. Note that a full flush is generally not recommended; multiple drain-and-fills are preferred.

  3. Adaptation Procedure: After software updates or fluid changes, the transmission may need to 're-learn' its shift points through an adaptation procedure. This can sometimes be done by a technician or, in some cases, through specific driving cycles. Initial driving after these procedures might still feel a bit off until the transmission fully adapts.

  4. Potential Causes:

    • Software Glitches: The most common cause for these symptoms in the 9HP is often software-related, leading to incorrect shift timing or pressure control.
    • Fluid Degradation: As mentioned, poor fluid quality impacts performance.
    • Internal Wear (Less Common for your mileage): While less likely at 65,000 miles without severe abuse, internal component wear (e.g., clutch packs, solenoids) can eventually lead to these issues. However, typically, software and fluid are the first culprits.

  5. When to See a Shop:

    • Immediately: If you experience any warning lights (e.g., Check Engine Light, Transmission Malfunction Indicator), hear grinding noises, or the transmission completely fails to engage a gear. A diagnostic scan might reveal codes like P0700 (Transmission Control System Malfunction) or more specific P07xx codes.
    • Soon: If the rough shifting or hesitation is persistent, worsening, or significantly impacting your driving experience. A qualified Acura technician can perform a thorough diagnostic, check for TSBs, and recommend the appropriate service, starting with software updates and fluid inspection.
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