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2017 MDX 9-Speed Transmission Hesitation and Rough Shifts

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Eric V. · rep 0 · May 22, 5:00 AM · 1 replies · solved · Question

Vehicle: 2017 Acura MDX Advance

Hey everyone,

I've been experiencing some really frustrating issues with the 9-speed automatic transmission in my 2017 Acura MDX Advance. It often hesitates when accelerating from a stop, and the shifts, especially between 1st and 3rd gear, can be quite harsh and clunky. It feels like the car is struggling to decide which gear to be in.

I've heard about some software updates or TSBs for these ZF transmissions. Has anyone else with a 2016-2017 MDX or TLX had similar problems? What was your experience getting it resolved at the dealership? I'm worried about long-term reliability.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:00 AM

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ClearTheCode admin answer:

  1. Identify the Symptoms: The 9-speed ZF transmission in certain 2016-2017 Acura MDX and TLX models is known for exhibiting symptoms like harsh shifts, hesitation, and clunking, particularly at lower speeds or during stop-and-go traffic. These issues often stem from software calibration rather than a mechanical failure.

  2. Check for Technical Service Bulletins (TSBs): Acura released several TSBs related to the 9-speed transmission for these model years. These TSBs often involve software updates designed to improve shift quality and address hesitation. You can ask your Acura dealership to check for any outstanding TSBs or recalls applicable to your specific VIN.

  3. Causes: The primary cause is typically the original transmission control module (TCM) software calibration, which can lead to suboptimal shift logic. In some cases, low transmission fluid levels or contaminated fluid could contribute, though less common for these specific symptoms.

  4. When to See a Shop: You should schedule an appointment with an authorized Acura dealership as soon as possible. Explain the symptoms clearly. They will connect your vehicle to their diagnostic system to check for fault codes and determine if a software update (reflash) is available and necessary. If a software update doesn't resolve the issue, they may investigate further for mechanical components like the valve body or solenoids, but this is less common for the described symptoms.

  5. Diagnostic Codes: While these issues might not always trigger a Check Engine Light, a dealership scan tool might reveal pending or historical transmission-related codes (e.g., P0700 - Transmission Control System Malfunction, or specific manufacturer codes related to shift solenoid performance or gear ratio errors) that can guide diagnosis.

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