Transmission Fluid Plug
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That is the fill plug.I want to make sure this is the transmission fluid plug where I can refill the transmission fluid. It is located near the battery. If someone can confirm for me, I would appreciate it. Thank you!View attachment 30259
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Yes. A 10" pair of pliers will grab it. It's a confined space. It's enough room to reach your pliers down and pull it out and and push it in. You can see some fluid on the end of it (if it's full) to give you a rough idea of the condition of the fluid. Not my favorite design. I prefer a dip stick for automatic transmissions. But, at least you don't have to pump it through the check plug on the side of the case from underneath the vehicle. I had to buy a special funnel to fill it. I serviced mine for the first time at 24,700 miles. It was dark brown. My friend has a civic with over 100,000 miles and never changed his. I'm curious to see how long his car lasts with the kind of abuse he puts it through and no preventative maintenance.
Thank you!
Why does the owners manual recommend filling the transmission fluid from the filler plug hole?
pg. 92
1. Remove the filler plug and the sealing washer
2. Refill the transmission with the recommended fluid into the filler hole plug until the transmission fluid overflows.
So I've got some bad news.
I decided to visit my mechanic and make sure the CVT fill plug was still in place before a road trip and he confirmed it came off again!!
Since I haven't been checking it, we have no idea when it came off the second time..
He said this has happened to two other customers of his, both with Honda CVTs so it was his opinion that there MUST be a TSB out there about this.
I've contacted the dealer to see if there's an updated part or a TSB, but I have my doubts.
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I decided to visit my mechanic and make sure the CVT fill plug was still in place before a road trip and he confirmed it came off again!!
Since I haven't been checking it, we have no idea when it came off the second time..
He said this has happened to two other customers of his, both with Honda CVTs so it was his opinion that there MUST be a TSB out there about this.
I've contacted the dealer to see if there's an updated part or a TSB, but I have my doubts.
I just came across a thread of someone with a civic and the same issue
He bought a new CVT fill plug, which has the same part number as the one required for the HRV - 25615-5T0-004
He wrote : "The replacement plug was .75 of a mm larger in diameter according to my calipers."
Source: ATF filler cap came off. Has this happened to anyone else? - Honda-Tech - Honda Forum Discussion
He bought a new CVT fill plug, which has the same part number as the one required for the HRV - 25615-5T0-004
He wrote : "The replacement plug was .75 of a mm larger in diameter according to my calipers."
Source: ATF filler cap came off. Has this happened to anyone else? - Honda-Tech - Honda Forum Discussion
Latest update on the saga:
-Dealer confirmed that there's no TSB on this issue and that the fill plug part number has always remained the same
-I found another thread about this issue which found a solution (link below). They wrote that the fill plug pops out of place because there's a breather vent that's clogged. I'll have my mechanic check it out next week and will update y'all to confirm if it is indeed clogged or not.
Thread with a solution: Honda CVT Fill Plug
The cap for the breather vent is part# 4 in this diagram (21396-P20-000):
https://www.hondapartsnow.com/parts...atic/at_torque_converter_case_components.html
Here's what a clogged breather vent looks like (from searching online - not my car) :
![30319]()
-Dealer confirmed that there's no TSB on this issue and that the fill plug part number has always remained the same
-I found another thread about this issue which found a solution (link below). They wrote that the fill plug pops out of place because there's a breather vent that's clogged. I'll have my mechanic check it out next week and will update y'all to confirm if it is indeed clogged or not.
Thread with a solution: Honda CVT Fill Plug
The cap for the breather vent is part# 4 in this diagram (21396-P20-000):
https://www.hondapartsnow.com/parts...atic/at_torque_converter_case_components.html
Here's what a clogged breather vent looks like (from searching online - not my car) :
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Where under the hood is the breather?
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Why is so grase that plug? my is clean and dry.So I've got some bad news.
I decided to visit my mechanic and make sure the CVT fill plug was still in place before a road trip and he confirmed it came off again!!
Since I haven't been checking it, we have no idea when it came off the second time..
He said this has happened to two other customers of his, both with Honda CVTs so it was his opinion that there MUST be a TSB out there about this.
I've contacted the dealer to see if there's an updated part or a TSB, but I have my doubts.
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Good question. I don't know why. The car is at 106,000km so maybe it's just a dirtier engine bay.
I bought a new plug to replace it. So far, the new plug has stayed in place for 400km.
Will ask my mechanic when he replaces the cap for the breather vent. I couldn't find it while looking around
Lo and behold, the cap for the breather vent was completely clogged (photo attached).
I feel bad for everyone who has this happen after 100,000km or so and has no idea it could eventually result in transmission failure.
![Finger Hand Thumb Rim]()
my mechanic was busy today so I couldn’t ask him to show me where the breather vent is located. I’m seeing him again next Thursday so I will ask him then.
I feel bad for everyone who has this happen after 100,000km or so and has no idea it could eventually result in transmission failure.
my mechanic was busy today so I couldn’t ask him to show me where the breather vent is located. I’m seeing him again next Thursday so I will ask him then.
Thanks for the info. Please try to post a photo of the breather location when you find it.
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Thanks for the information. I found this official Honda service article regarding that breather cap.
https://www.google.com/url?sa=t&sou...FjAFegQIAhAB&usg=AOvVaw2EoroiMuS6GRfxLEoQb0zO
Thanks to that article I was able to locate the breather cap. Not an readily visible location but easily accessed by feel once you know where it is. My 2016 only has about 20,000 miles but the breather was almost completely blocked. Quickly removed and cleaned with a piece of wire but I don't recall seeing that as a regular maintenance or inspection item. I will be doing that as part of every oil change from now on.
SlowFosho, this is unbelievable. Good for you for finding it. My mechanic kept telling me the dealership isn't being honest and that they must be dealing with this all the time.
I'm hoping the manager I spoke to was simply mistaken. I'd hate to think they're keeping quiet in hopes that they'll get the business from a failed transmission.
If that is the breather cap, the price sounds high. No need to replace it, just clean it out.
$16.42 was for the rubber fill cap
Breather cap was $7.61
(Canadian dollars)
You're 100% right that the cap can be cleaned but I wasn't sure if it would be missing once it was located so I had bought it.
Breather cap was $7.61
(Canadian dollars)
You're 100% right that the cap can be cleaned but I wasn't sure if it would be missing once it was located so I had bought it.
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Where under the hood is it?
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