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2018 MDX 9-Speed Transmission - Rough Shifts and Hesitation Concerns

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Kevin B. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2018 Acura MDX Advance

Hey everyone,

I've got a 2018 Acura MDX Advance with the 9-speed automatic transmission, and I've been noticing some really rough shifts, especially between 2nd and 3rd gear, and sometimes a noticeable hesitation when accelerating from a stop or at lower speeds. It's not constant, but it's frequent enough to be concerning.

I bought the car used a few months ago, and while it's generally great, this transmission behavior is making me question the long-term reliability. Is this a common characteristic of the 9-speed in these MDX models, or should I be worried? I've heard some mixed reviews about this transmission.

Has anyone else experienced similar issues with their 2018 MDX or other Acura models with the 9-speed? What did you do about it? I'm trying to figure out if this is something I need to take to the dealership immediately or if it's just how these transmissions operate.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It's understandable to be concerned about rough shifts and hesitation in your 2018 Acura MDX's 9-speed automatic transmission. This particular transmission, while designed for efficiency, has had some documented characteristics that owners have reported.

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

  1. Common Characteristics & Causes:

    • Software Calibration: Early versions of the 9-speed transmission (ZF 9HP) in various Acura and Honda models often had software calibrations that could lead to less-than-smooth shifts, especially in lower gears. Acura has released several software updates (TSBs - Technical Service Bulletins) over the years to address these shifting behaviors.
    • Adaptive Learning: The transmission has an adaptive learning system that adjusts shift points based on driving style. Sometimes, a reset or re-learning procedure performed by a dealership can improve shift quality.
    • Transmission Fluid: Incorrect fluid levels or degraded fluid can significantly impact shift quality. The 9-speed requires specific ZF-approved fluid.
    • Sensor Issues: Less commonly, a faulty transmission speed sensor or pressure sensor could contribute to erratic shifting, though this often triggers a Check Engine Light (CEL) with codes like P0700 (Transmission Control System Malfunction) or specific P07xx codes.

  2. When to See a Shop:

    • Immediate Concern: If the rough shifts are accompanied by a Check Engine Light, a flashing D light, a noticeable loss of power, or any unusual noises, it's crucial to have it inspected by an Acura dealership or a trusted independent mechanic specializing in transmissions right away.
    • Persistent Discomfort: Even without a CEL, if the shifting behavior is consistently bothersome and detracts from the driving experience, it's worth having a professional diagnose it.

  3. Recommended Steps:

    • Check for TSBs: Contact an Acura dealership with your VIN. Ask them to check for any outstanding Technical Service Bulletins (TSBs) or software updates related to the transmission for your specific 2018 MDX. This is often the first and most effective step.
    • Transmission Fluid Inspection: Have the transmission fluid level and condition checked. Ensure it's the correct fluid type and that it's not discolored or burnt. A fluid change might be recommended if it hasn't been done according to the maintenance schedule.
    • Diagnostic Scan: Even without a CEL, a professional scan tool can sometimes reveal pending or historical transmission-related fault codes that haven't illuminated the dash light yet.

Addressing these concerns proactively can help ensure the longevity and reliability of your MDX's transmission.

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