I have not experienced that, but I only have 5,000 miles on mine. I did have a weird shift about three weeks ago where I was accelerating hard after turning onto a highway and the shift to 3rd gear was really sloppy. In your case, it sounds like the transmission fluid might be low, causing the low pressure when cold and then once it warms up and expands, the pressure increases. I had that happen on my Mercedes and it started doing all kinds of weird shifting things. But even if that is the case, it could indicate a leak, unless it was filled right at the minimum at the factory. I don't even know how to check the level or if there is a way, or what the service interval is on the transmission. Guess I should break out the manual. Anyway, hope it's nothing serious.

 

There's no dipstick or way to easily check the transmission fluid level. I've read the manual and the manual does not say how to check it. Regardless it should not be low at this point in it's life. It's 6 months old and has less than 30k miles, the manual only says to inspect the fluid every 40k miles and replace every 62k miles.

 

I'd be seeing the dealer. Demand a loaner.

 

The vehicle has to be on a level lift to check it by removing the transmission fill bolt, inserting finger to feel for fluid and adding until it starts to pour out of the fill hole. These are sealed transmissions so no dipstick.

 

Where is the fill bolt? I'm assuming I'll be crawling under the vehicle for this. I'm guessing since I've seen no leaking (my house is pretty new with zero stains on my driveway), that there's some pumpin the transmission that's going out, or not priming properly when the car is first starting and is taking too long to get going. I used to be a jet engine mechanic, Dual Clutch Transmissions are way more complicated than a High Bypass Turbofan. 🤣

 

The dealer said there's a leak in the transmission and it will need to be replaced. I don't have a ton of details, and the dealer doesn't know how long the transmission will take to even get in. They won't know for a few more days, they'll provide me with a rental car as soon as Enterprise has some available (should be Thursday). I'll keep this post updated when I find out more about what caused the leak, how long it will take to get the transmission and whatever else I find out from Hyundai.

 

I have a 2021 Santa FE that I bought 7 weeks ago. I have 1100 miles on it and just discovered the tranny leaking. Took it into the dealership where I bought it 7 weeks ago and they said they are replacing the whole transmission. 4 days to get in tranny and 1 day to replace. Still would like to know more details myself.

 

Sorry to hear about this new problem you have as you had expended and awful lot of energy in the past finally getting that spare tire problem taken care of. I'm wondering why, if it is a leak which usually indicates a failed seal, that it cannot simply be repaired. I suppose it may be something internal and I'm wondering if the service personnel are sufficiently trained or have the necessary experience working with DCT's. Regardless, you have a good warranty so might as well use it. Keep us posted.

 

I'm wondering why, if it is a leak which usually indicates a failed seal, that it cannot simply be repaired.

Why speculate? There’s probably a dozen reasons for a leak to occur that are far simpler than a failed seal. But I’m more surprised that the OP didn’t notice the fluid was indeed escaping/leaking.

Blue link now reports on fluid levels for Oil, Brake, and Washer. Maybe they can add a DCT fluid level sensor report.

 

That certainly sucks...sorry! It must be a really slow leak that has been going on maybe since you purchased it if it got low enough to cause issues and not show up on the driveway or anything. Surprised they didn't just add oil and have you keep driving it until it can be fixed or replaced, but maybe they did that and it was still misbehaving, thus the decision to replace and get you a rental. Hope it's not too long of a wait.

 

Sorry to hear of the trouble. I would speculate that Hyundai wants to replace so that engineers can get their hands on the transmission to study and test it.

 

The 10 Day estimate to get my transmission installed has now turned into 30 days. I received a text from my service advisor this morning letting me know that the transmission wouldn't be done until mid-October. I'm looking now to see if the dealership will trade the car in or buy it from me. I'm stuck with a POS rental car that I'm paying part of (they're paying the majority of it, but I'm stuck with $9 a day on it which adds up over the month to the equivalent of a car payment. I had a feeling this would happen, my guess is that the transmission is coming from Korea, but that's anybodies guess at this point. I'm going to the dealership tomorrow and I'll post more when I find out more.

 

After reading a post on another thread where someone is waiting on a starter which is on back order (pretty integral component to getting your vehicle started) I wondered if you would suffer the same fate. There is still a record backlog of cargo ships at California ports which account for about half of all cargo containers entering the US. Hopefully your wait will not drag on for too long. I also ran across a review recently on the 2022 Corvette where there have been a few complaints of leaking DCT's but no idea how prevalent it is with that vehicle or yours.

 

I'm pretty annoyed, I have a feeling that there are thousands of them in Alabama right now that are waiting to be put in cars that haven't been assembled due to the chip shortage. My windshield that I just replaced took six weeks to arrive and I'm really not willing to wait that long. I'm just hoping that I can get the dealer to agree to a reasonable offer for a trade in or even to buy the car off of me for KBB trade in price.

 

I own a 2021 Hyundai Santa FE Limited.(Bought it new in January 21) Today after shopping and loading the groceries in the back. The following occured:
As normal started the car, put it into Reverse, hear the RPM going higher...but no movement. Put it into Drive same thing. Called BLUE LINK - waste of time.... Towed the vehicle to my house (my expense) and after an hour or so, tried to start the car, backed out of the driveway..and got stuck in the middle of the road. With some help from neighbors pushed it to the driveway. Tomorrow I will call the dealership and see what the story is. Very disapointed, to say the least.

 

Look at the manufacture date stamp on the B pillar. If it says between January-March of 21 or a week or so either direction, there was a significant bubble of DCT failures for cars built in that range. Not saying that's what it but your date brings it to mind.

 

Is there any way you can have someone check it or do you have the Monroney label which should give you the codes and build codes? If it's in that range, you have a pretty strong BBB and Lemon law case, I believe, that you can pursue.

 

The BBB is worthless (it's just a place where you can see complaints about a company), and lemon laws only kick in after the dealer has tried on numerous occasions to repair, and has failed (number/frequency depends on state law). I don't think it covers parts back-orders.

 

My 2021 S.F. shifts beautifully and I have not read or heard of any major problems with this DCT except on this forum
Will, I ever check fluid levels..... NO
If I should have any problems I'll let the 10 years 100K warranty take care of this.

 

My 2021 S.F. shifts beautifully and I have not read or heard of any major problems with this DCT except on this forum

I mean, where else would you have heard about it except in a group of owners? Talking to your neighbors who don’t even own the same vehicle as you?

It took Hyundai years to finally recognize the problem and issue a recall for the Theta II engine debacle, and those engines were used across multiple vehicle platforms with NHTSA investigations.

If I should have any problems I'll let the 10 years 100K warranty take care of this.

That’s all fine and dandy, except current owners who’ve been affected by their transmission failure have been without their vehicle for months, all while being put up in a stripper compact rental or loaner (a far cry from a fully loaded mid-size SUV in features and space).

The warranty isn’t much good when there’s a parts shortage and Hyundai prioritizes the available parts to building new vehicles over fixing an existing customer’s vehicle.

 

Hi there I had exactly the same problem with a 2021 Santa Fe 2.2 diesel with 14000 kilometres.

Engine on, full electrical but push the throttle and no revs. RACQ couldn'tdiagnose it. It was towed. Local service dealer (Northside Hyundai) and the place of purchase (Metro Hyundai) have been great but am waiting 2 months for a new transmission.

Hyundai Customer service are woeful. So under Qld Lemon Laws I took the first steps in seeking a refund.

 

I'm sure there's a way to change fluid, but we need instructions. I remember reading a post about that, but didn't bookmark it, as I didn't expect having to mess with that. I remember reading it has TWO fluid chambers (the gearbox and control fluid), and the control one was a real PITA to do, especially the fill plug, requiring removal of the transmission side wheel, and a very long extension. When I changed the oil, I didn't scrutinize the tranny in depth, but saw a drain plug, probably the gearbox one. For the future, always remove the fill plug first, in case you can't, so you still have the vehicle operational. Finally, DCT trannies can have a complicated procedure to check fluid level, so hope it's simpler on this one. Even the torque-converter ones need to check fluid at a certain temperature range (typically 120-140F), which is hard to do without a lift, and special equipment to read fluid temperature. Somebody with access to the service manual could shed some light on the procedure .