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They first did the TSB on mine, and it didn't work. Then they replaced the transmission.
did you ever find a definitive issue with this problem? I just bought a 2017 and noticed this shudder also. I assumed it is the act of transferring power and activating the electric motors on the axles themselves or something like that. Maybe mine has the same problem. Good thing I’ve got it certified bumper to bumper I guess.
 

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did you ever find a definitive issue with this problem? I just bought a 2017 and noticed this shudder also. I assumed it is the act of transferring power and activating the electric motors on the axles themselves or something like that. Maybe mine has the same problem. Good thing I’ve got it certified bumper to bumper I guess.
Sorry, I never followed up on the issue. In fact, they replaced not only the transmission, but also the computer that controls the transmission itself, and also the power flow and drive train. According to Honda, the transmission was faulty from the factory and it damaged the transmission with false instructions. Since the fix, the drive train has become much smoother, particularly in stop-and-go traffic, where originally it could become noticeably rough. I still find that moving away from a stop without the engine stopped, I feel a slight roughness when the engine is cold, and it takes about five minutes of driving (during which time the engine runs continuously for warm up) to fix this. Otherwise, it's very smooth on startup from a stop with the engine off, with only the slightest roughness, which you'd have to be looking for to even notice it. The computer that failed is mounted under the center console, and this change required removing both of the front seats and the entire console, from the dashboard all the way to the back. They got it all back in perfectly aligned and rattle free. The power flow diagram (in "info") for the upper screen is getting the information from the computer and shows how the computer is shifting flow.
 

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All that work sounds like a $6,000-$8,000 fix for parts and labor. No way I could fix out of warranty. Haven't felt the same issue on my 19 MDX hybrid; but, I need to take it in if I do.
 

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All that work sounds like a $6,000-$8,000 fix for parts and labor. No way I could fix out of warranty. Haven't felt the same issue on my 19 MDX hybrid; but, I need to take it in if I do.
I'm sorry, but I made an error in my last post. It was the COMPUTER that was defective from the factory, not the transmission itself. And the computer then "mishandled" the transmission and caused some damage, which I felt from the beginning as erratic, peculiar "clunky" behavior that I thought was normal. But yes, this would be an expensive repair if you were paying for it. This is a very complex system, but I suspect it will be reliable, as Honda has had a lot of experience with this system with the RDX and NSX. I also believe that the warranty on the hybrid system is seven or eight years (I don't remember which) and that this would be considered part of the hybrid system. The computer is controlling power source and flow, high voltage recharging and engine stop and start. To me the complexity is worth it because of the performance and pleasure it provides.
 

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My 2018 Black-Copper Pearl Hybrid with 24k miles is at a dealer getting having it's transmission replaced with new. I bought the MDX new, off the production line two years ago this month. Within a month or two after taking delivery I started hearing a short duration (1-second) buzz when shifting the lower gears between 1500 & 2000 RPM. Short story is that local mechanics had no idea what was causing the buzz.Over time the buzz grew more frequent, and shifting became herky-jerky. Visits to the local dealership were going nowhere, so I wrote a letter to Acura Customer Service in Torrance.

The letter quickly got things moving. AHM (American Honda Motors) scheduled a Field Technical Specialist to evaluate my issue. Turns out the Field Technical Specialists not only knows what he's doing, he has access to technical resources that local service department don't have, and most importantly...he has a BUDGET to make things happen. And happening they are. A new transmission was shipped overnight from NC to Ft. Myers FL, and the replacement process is underway as we speak. So sometime during the first part of next week I expect to have my 2018 MDX hybrid. sporting a brand new up-to-date transmission back.
 

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another reason to put it in park as a habit. Get used to it doing it automatically, then get in a car that doesn't and then forget to put it in park....... you get the picture!
 

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My 2018 Black-Copper Pearl Hybrid with 24k miles is at a dealer getting having it's transmission replaced with new. I bought the MDX new, off the production line two years ago this month. Within a month or two after taking delivery I started hearing a short duration (1-second) buzz when shifting the lower gears between 1500 & 2000 RPM. Short story is that local mechanics had no idea what was causing the buzz.Over time the buzz grew more frequent, and shifting became herky-jerky. Visits to the local dealership were going nowhere, so I wrote a letter to Acura Customer Service in Torrance.

The letter quickly got things moving. AHM (American Honda Motors) scheduled a Field Technical Specialist to evaluate my issue. Turns out the Field Technical Specialists not only knows what he's doing, he has access to technical resources that local service department don't have, and most importantly...he has a BUDGET to make things happen. And happening they are. A new transmission was shipped overnight from NC to Ft. Myers FL, and the replacement process is underway as we speak. So sometime during the first part of next week I expect to have my 2018 MDX hybrid. sporting a brand new up-to-date transmission back.
another reason to put it in park as a habit. Get used to it doing it automatically, then get in a car that doesn't and then forget to put it in park....... you get the picture!
Fortunately, I've never had symptoms anything like what you're describing. Mine situation was rooted in the defective computer.
 

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My 2018 Black-Copper Pearl Hybrid with 24k miles is at a dealer getting having it's transmission replaced with new. I bought the MDX new, off the production line two years ago this month. Within a month or two after taking delivery I started hearing a short duration (1-second) buzz when shifting the lower gears between 1500 & 2000 RPM. Short story is that local mechanics had no idea what was causing the buzz.Over time the buzz grew more frequent, and shifting became herky-jerky. Visits to the local dealership were going nowhere, so I wrote a letter to Acura Customer Service in Torrance.

The letter quickly got things moving. AHM (American Honda Motors) scheduled a Field Technical Specialist to evaluate my issue. Turns out the Field Technical Specialists not only knows what he's doing, he has access to technical resources that local service department don't have, and most importantly...he has a BUDGET to make things happen. And happening they are. A new transmission was shipped overnight from NC to Ft. Myers FL, and the replacement process is underway as we speak. So sometime during the first part of next week I expect to have my 2018 MDX hybrid. sporting a brand new up-to-date transmission back.
6/18/20
Well, the transmission replacement completed last Tuesday the 9th. Smooth as silk she glides through the gears, and switches between battery and gas engine power. Gone are the herky-jerkies and the mysterious buzz. I suspect that this is not the fires Hybrid transmission Acura has had to replace because the replacement is a prepackage "kit", part#06210-5WV-A02RM :WARRANTY A/T KIT.Google
it. As a kit it contains all the various bits-n-pieces, plus a brand new transmission. I occures to me that this must occur frequently enough that it's expeditious to build and market a transmission replacement warranty replacement kit. Everything you need in one very expensive box.
 
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