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I created an account to let y'all know there's a Technical Service Bulletin about this issue:

https://static.nhtsa.gov/odi/tsbs/2019/MC-10165374-0001.pdf

I asked my dealer if there was a TSB and they said no....

My HRV had the exact same issue and thanks to this thread, I figured out the cause of the fill plug popping out twice.

The cap for the breather vent was clogged shut (photo from my car can be found in the following link)
Transmission Fluid Plug

492007
 

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Interesting. They left off the 2014-15 Civics.
Thanks for sharing.

Sent from my SAMSUNG-SM-G900A using Tapatalk
 
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Just found this happened to me today. Was trying to figure why I was getting some hesitation in my shifts. Cap was just sitting on top of the body next to the hole. I was hoping the shift issue had something to do with it. It seemed a bit better going from first to second but I still have something to worry about cause irs a little rough still on the higher one. Thanks for letting me know a replacement is the way to go. I'll grab one tomorrow.
 

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My friend had this issue. He took it to the dealer and they replaced the plug. Told him they had no idea why it happened. They didn’t recommend changing the fluid and they charged him to replace the plug. A couple months later the transmission failed, and I assume this was due to all the contamination that entered the transmission while the plug was out. In my opinion, Honda needs to replace the transmissions for people if the plug ever comes out. A minute amount of contamination in a hydraulic system can cause permanent damage.
My buddy has 4 kids and really couldn’t afford for this to happen. F**k Honda
 

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What year(s) are these vehicles? Im curious if it is happening across the board or only certain years.

The fill plug will typically pop out if the fluid is over filled or the breather/vent tube is plugged.

However it could also simply be a crappy design. Not the first time.

ATF dipsticks on late 90s to mid 2000 Civics also would pop out as the dipsticks started to age.
I've got a 2014 civic touring 1.8L and it keeps popping out every time I drive.
 

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I found
I created an account to let y'all know there's a Technical Service Bulletin about this issue:

https://static.nhtsa.gov/odi/tsbs/2019/MC-10165374-0001.pdf

I asked my dealer if there was a TSB and they said no....

My HRV had the exact same issue and thanks to this thread, I figured out the cause of the fill plug popping out twice.

The cap for the breather vent was clogged shut (photo from my car can be found in the following link)
Transmission Fluid Plug

View attachment 492007
Thanks for posting the bulletin. My vent was clogged and the rubber was cracked, possibly from pressure. I'll have to see about replacing the vent cap and I'll see if this stops the fill plug from ejecting.
 

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I cleaned out the vent cap, went for an hour long drive and the fill plug hasn't popped out! Thanks for the help.
 

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Today will be day 5 of owning my 2015 Civic. The night I bought it saw the fill plug missing. The dealer I bought it from said they found it laying on the transmission. They say they serviced the transmission and it's fine. Yesterday the plug was out again.
Honda Service bulletin A19090B States this is a know issue. The CVT transmission vent is plugged/ blocked. They say to simply pull the vent plug and clean with compressed air and reinstall. It also says to replace the fill plug if it appears to fit loosely in the transmission. Guess I am heading back to the dealer to give them a 3ard chance to get this right.
 
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