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2018 MDX Rough Shifting & Jerking - Is this normal or a known issue?

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Mike T. · rep 0 · May 24, 2:45 PM · 1 replies · solved · Question

Vehicle: 2018 Acura MDX Advance

Hey everyone,

I've got a 2018 Acura MDX Advance with about 65,000 miles, and lately, I've noticed some really rough shifting, especially at lower speeds or when the transmission is cold. It feels like a distinct jerk when shifting between 1st and 2nd gear, and sometimes even 2nd to 3rd. It's not constant, but it's happening more frequently and it's quite noticeable.

Is this something common with the 9-speed automatic transmission in these MDXs? I'm trying to figure out if this is just 'characteristic' of the transmission or if it's a sign of a potential problem. I've heard some chatter online about these transmissions, but I'm not sure if it applies to my model year.

Has anyone else experienced similar issues with their 2018 MDX or similar Acura models? What did you do to resolve it, or what was the diagnosis? I'm debating whether to take it to the dealer right away or if there's something simple I should check first.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 2:45 PM

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ClearTheCode admin answer:

Rough shifting in your 2018 Acura MDX Advance is a concern that should be addressed. While the 9-speed automatic transmission in some Acura models has had various reported characteristics, persistent jerking or harsh shifts, especially when cold or at low speeds, typically indicates an underlying issue rather than normal operation. Here's a breakdown of common causes and steps to consider:

  1. Check for Technical Service Bulletins (TSBs) and Software Updates:

    • Acura has released TSBs related to transmission shifting performance for various models and years, including those equipped with the 9-speed automatic. These often involve software updates to the Transmission Control Module (TCM) to refine shift logic and improve smoothness. Your dealer can check if your VIN is covered by any applicable TSBs or if there's a newer software calibration available for your vehicle.

  2. Transmission Fluid Condition and Level:

    • Contaminated or low transmission fluid can significantly impact shifting performance. The 9-speed transmission requires specific Acura DW-1 or ATF 3.1 fluid. While often overlooked, a fluid flush and filter replacement (if applicable to your model) can sometimes resolve minor shifting issues. Ensure the fluid level is checked correctly according to the manufacturer's procedure, which often involves specific temperature ranges.

  3. Transmission Component Wear:

    • Less commonly for a 2018 model with 65,000 miles, but possible, could be wear in internal transmission components like clutch packs or solenoids. These issues typically present with more consistent and severe symptoms. If a software update and fluid service don't resolve the problem, further diagnostic testing may be needed.

  4. When to See a Shop:

    • Given the nature of the problem, it's highly recommended to have your MDX inspected by an authorized Acura dealership or a reputable transmission specialist. They have the necessary diagnostic tools to read specific Acura trouble codes (which may not trigger a generic OBD-II check engine light but could be stored in the TCM), check for TSBs, and perform proper diagnostic procedures.
    • Don't delay addressing this issue, as continued rough shifting can accelerate wear on transmission components, potentially leading to more costly repairs down the line. If you notice any warning lights (like a 'D' light flashing) or a significant change in driving behavior, pull over safely and have the vehicle towed to prevent further damage.
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