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Discussion Starter · #1 ·
First timer here on the forum and posting if it may help others.

Last week, I noticed a couple of oil stains on the garage floor. Lifted the car and noticed the bottom of the trans axle case was covered in oil. The proceeded to trace the origins of the leak by spraying the entire are down with brake cleaner and wiped down.
From there I took the car for test drive for about 5-10 miles, lifted the car on jack stands, removed the driver front wheel and the bottom plastic tray/panel under the
engine/trans.
On the image below is where the leak was found. Over the weekend trying to find what this was ( case plug, cover for shaft race) but came up with nothing. Best schematics I could find were found here 2019 Hyundai Veloster N Transaxle Case-Manual. Today I dropped it off at the dealer, they responded this part not to be found was not serviceable and Hyundai will be providing a new transmission for replacement.
If others have a similar issue my leg work may save someone some time.
2745
 

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Discussion Starter · #4 ·
Yup, what JoeJoe said. I was told the alignment pins in the casing were either bent (when the two cases were mated) or malformed (when manufactured) thus not completely sealing the case. See also: Trans Fluid Leak
I don't believe this is the same issue as I think what you are referring to are alignment pins from the transmission housing that align with the trans axle case.

Either way. good on Hyundai and the dealer on handling this issue.

Day 1, dropped the car off to the dealer with a printed image from the original post. Told the service writer, the tech doesn't need to trouble shoot, tear down or test as I've verified the origin of the leak. Morning of day 2, the dealer calls, Hyundai say's they want the transmission and sending out a new replacement. Day 5, transmission arrives and Day 6, around noon, the transmission has been installed and ready for pick up.
 

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So I just did my first oil change at 1k - my brother in law is a mechanic by trade so him and I did it together. After lifting the vehicle up to access the oil pan and filter we noticed a few oil droplets accumulating on the bottom of the trans case. This was just a couple of days ago.
I just lifted the car back up about 30 mins ago to inspect the trans case for leakage again and sure enough there were some droplets accumulating. Looks like I’ll have to call the dealership tomorrow when the service desk is open and schedule to have it go in. Ugh, not really what I want to deal with but I’m sure it’ll all be covered under warranty.
 

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Discussion Starter · #7 ·
So I just did my first oil change at 1k - my brother in law is a mechanic by trade so him and I did it together. After lifting the vehicle up to access the oil pan and filter we noticed a few oil droplets accumulating on the bottom of the trans case. This was just a couple of days ago.
I just lifted the car back up about 30 mins ago to inspect the trans case for leakage again and sure enough there were some droplets accumulating. Looks like I’ll have to call the dealership tomorrow when the service desk is open and schedule to have it go in. Ugh, not really what I want to deal with but I’m sure it’ll all be covered under warranty.
If you find the origin/location of the leak, please share.
 

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Dealer is replacing the transmission. They’re going to contact me on Monday with an ETA and once I hear more details on where it was leaking from I’ll update the thread.
 

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You can also add me on to the list of replaced transmissions 2020 pp at 1800 miles🙃
Man. It sucks. They’ve hade my car for going on two weeks. I took it in a week prior and they said it was a leaky seal. They replaced the seal and it continued to leak. I’m thinking the seal replacement was just a bandaid because this is clearly a known issue with our cars now.
 

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Man. It sucks. They’ve hade my car for going on two weeks. I took it in a week prior and they said it was a leaky seal. They replaced the seal and it continued to leak. I’m thinking the seal replacement was just a bandaid because this is clearly a known issue with our cars now.
agreed. Just to clarify they still haven’t even ordered a new tranny for you yet? Plan on taking it in first thing in the morning so they can look at it and come up with a decision even though it clearly needs a new unit.
 

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Ugh... I'm really curious now as to if all of these "defective" casements were from the same shift during manufacturing. There's gotta be a way to correlate all of these units (since going by blocks of VINs doesn't seem to work).
 

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Update: went to dealership this morning and they threw on lift. Guy Claimed to be a transmission plug leak 🧐 In which I told him to look further as I don’t want to keep visiting dealership when the car needs a new transmission . This seems to be slowly forming into a problem
 

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agreed. Just to clarify they still haven’t even ordered a new tranny for you yet? Plan on taking it in first thing in the morning so they can look at it and come up with a decision even though it clearly needs a new unit.
As of this morning apparently they’ve ordered it up and it will be here next week sometime. By the time I actually get it back together it will be almost 3 weeks since they’ve had my car for this issue. They have no choice but to replace your transmission, no questions asked. There’s some other threads on here as well where people have had to get a new trans. 😟
 

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Update: went to dealership this morning and they threw on lift. Guy Claimed to be a transmission plug leak 🧐 In which I told him to look further as I don’t want to keep visiting dealership when the car needs a new transmission . This seems to be slowly forming into a problem
Oh wow! That’s a carbon copy of what they did and told me! Oh it was just a minor plug leak, nothing major they said. As soon as I got it home after about 2 hours it started to leak worse that before. My whole thing is, wouldn’t you pull the plug/seal and see it’s not damaged then further investigate?
 

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The initial thought on mine was that the trans fluid was overfilled and it was seeping out of the upper bung ...nope. What I was told on how they localized it was by bringing the transmission up to temp and then letting it cool. From there they were able to pinpoint the leak at the locator pins on the casing.

Keep on 'em!

--JamesT
 

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update was actually told it was the oil plug and that the oil was slowly tricking down to the transmission but this is impossible. The oil drain plug is no where near the transmission. It’s smells like transmission fluid! I even did an oil change the day before , even added a new oil drain plug from Hyundaiparts. Was asked if I had done an oil change and was not sure to say yes or no so said no just so I didn’t end up voiding warranty. I used liqui moly 5w40
 

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Oh wow! That’s a carbon copy of what they did and told me! Oh it was just a minor plug leak, nothing major they said. As soon as I got it home after about 2 hours it started to leak worse that before. My whole thing is, wouldn’t you pull the plug/seal and see it’s not damaged then further investigate?
exactly. Same happened to me. The leak is worse now!
 

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Man. It sucks. They’ve hade my car for going on two weeks. I took it in a week prior and they said it was a leaky seal. They replaced the seal and it continued to leak. I’m thinking the seal replacement was just a bandaid because this is clearly a known issue with our cars now.
That’s weird, my dealer put a brand new tranny in mine. They didn’t even bother with the seal.
 
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