Add me to this list. I have a 2025 Tucson Hybrid for about a month and a half now. 12V battery has disconnected about 8 or 9 times already. Can't get into the car when this happens, although manually opening the back hatch wakes up the car and then you can open the driver's door without resorting to the manual key lock. I do have to press the 12V battery reset button. Very frustrating to say the least. I talked to service department, and they suggested to disable the "Auto-Dry" option under the climate settings, but this hasn't help me.

 

Had similar issue 6 days after buying the car. I turned off auto dry and when leaving the car I turn off the climate, radio, and lights. Haven’t had an issue since ( about three weeks and counting)

 

Any update on hyndai 2025 d3ad battery?

 

I'm having a similar experience with my 2022 Limited hybrid. I was out of town and did not use the car for 5 days. I was locked out of my car. I took it to the dealership and was told that replacing the 12v battery would take one to three months. The dealership gave me a Kona for a loaner. Is anyone else experiencing these kinds of delays?

 

Mijn hybride van 2025:staat,met hetzelfde probleem al 2 maanden bij de dealer

 

We have had the same problem and when I was sitting in the car with the ignition off the circulating fan starting running. It ran for about ten minutes and was draining the battery so, rather than leaving it running I started the engine. Why would this happen? If the car is empty and the ignition is off why would this fan come on and drain the battery. I asked the dealer and he said it is a problem that they are working on and they would take out the fuse that controls the blue link. Time will tell if it works.

 

That's the auto dry feature that runs the fan to dry out the evaporator coil so that it won't develop that moldy "old sock" smell. The feature can be turned off in the settings.

 

I’m a first time car buyer, thinking to buy Tucson 2025 ultimate hybrid. Wanted to know is it good option to consider. Is this causing a lot of issues?

 

No issues for me in the US after 3 weeks. Seems to be a Canadian issue.

sorry, just realized you’re in Canada. 😞

 

Touch wood, I've had my 2025 Canadian Ultimate four weeks now and I have not experienced this issue.
Having said that, I'm not using the AC now the weather is cooler. I have heard the drier fan a couple of times, if that is the real cause.

 

In Canada... Seems my new 2025 Tucson HEV battery disconnecting issue is OK now. I have always made the changes to all 3 user profiles, Driver 1, Driver 2, and Guest. I have had the climate Auto-Dry option OFF for over a month but still have disconnecting battery issue after not driving for a day or two, happened more than 10 times. So, over the last few weeks, I have turned OFF all the other 3 options under the climate settings in all 3 user profiles in order to try something to solve this issue and it worked. Vehicle is now in sleep mode, meaning that Bluelink is not constantly connecting. Every time I check the Bluelink app previously it was always up to date within the last minute or two, now the time of last refresh is at the last time the vehicle was driven. So, I decided to turn back on the first 3 option under the climate setting one at a time to try and figure out which one was the issue, now all the first 3 are back on and vehicle is still sleeping. So, that's weird and I don't know what to think now. Maybe something changed on the Bluelink server side or maybe because of the weather now the AC doesn't really run now. I have confirmed with Bluelink and dealer that Hyundai OTA updates are not available for Canada at all.

 

I had the exact same issue two weeks after I purchased. Took it to dealer and they disabled over air updates or something... Now I cannot use the MyHyundai app to do anything remotely ie. remote start. Love that I am going to need to go outside in the winter to start my brand new vehicle!

 

Bluelink maybe disabled while they work to find and fix the cause of the battery drain issue, but you should still be able to use the remote start button on your key fob. Assuming you are close enough to your vehicle, of course.

 

Hello, is your problem solved? What was the issue?

 

Just a warning for those folks that have disconnected BlueLink by removing the fuse. By doing this your Automatic Collison Notification and Assistance and SOS Emergency Assistance services will not work. So, your vehicle will be unable to automatically detect and provide its location in order to respond to any emergencies or collisions.

 

All Bluelink features would naturally be disabled but better than a dead car every day or so if pulling the fuse for now is needed.

 

Guys, I just responded on another thread to the very same issue. It is simple.
1) Remove the Bluelink App from your phone memory after using it. No need to delete the app
2) Delete the digital key if you have configured.
I also had the same issue two weeks into buying this SUV. With suggestions from fellow owners I followed the above steps and for weeks now I am NOT seeing this issue. Unfortunately we are losing the benefits of the digital key but hoping for Hyundai to fix it. The thing is they both keeps pinging your car causing the battery to drain. Hope that helps!

 

I am alright with not using my digital key but I want to have Bluelink set up. However, I am scared that I will come across this 12V issue with it set up. Have you had the issue since you made the adjustments that you posted about?

 

I paid my dealer to unplug the phone module (mine is behind the radio in center cluster). Had them disconnect the Sirus module as well.

My two problems solved.

 

Any word on a solution yet? Has Hyundai admitted they have an issue?

 

Hyundai has issued instruction to pull out the fuse for Bluelink system. They did this to my car( Tucson Hybrid 2025) over a month ago and since then all is OK.

 

Are you still able to use the Bluelink and digital key?

 

I have a 1.75 year old 2023 Tucson Limited Hybrid with 11K miles. I experienced the 12V battery disconnect for the first time this week after I had parked the vehicle in my garage with the doors locked for 2.5 weeks. When I used the 12V Battery Reset to start the car, I noticed that the hybrid battery gauge showed 50% charge, and it backed out of the garage in EV mode using just the battery. So the battery was not discharged, and the system should not have disconnected the 12V battery tap. So far, it has worked normally in the week since. Has anyone else noted the state of their battery charge after resetting the 12V connection and starting the vehicle? I suspect there is an issue with the disconnect logic, not a battery drain issue. BTW, there is no 12V battery in this vehicle. It is a 12V tap off the hybrid lithium battery. Anyone who thinks they're getting a 12V battery replacement is sorely mistaken.

 

The battery gauge is showing the state-of-charge (SOC) of the traction battery not the 12V battery. Hyundai doesn't give us a 12V SOC indication unfortunately.

The 12V battery is not a tap of the HV traction battery. It is a fully separate battery that charges and discharges completely independent of the traction battery. There is no electrical (except ground) connection or physical connection between the 12V battery and HV traction battery. See this post for more discussion (esp post 9):

https://www.hyundai-forums.com/threads/storage.718112/?post_id=6304799#post-6304799

 

According to the 2023 Tucson HEV Owners Manual, page 8-4: "This vehicle does not have a regular 12V battery that needs periodic replacement. It is lithium ion polymer type integrated into the HEV high voltage battery." IMHO, this clearly states that there is no separate 12V battery in the HEV vehicle, it is an integrated part of the HEV high voltage battery, which you call the "traction battery". I don't know from where the rumor of a separate battery originates, but the Owners Manual for the HEV vehicle is quite explicit. The SOC indication reflects the charge of the HEV high voltage battery, of which the 12V output is an integrated part.

 

... I don't know from where the rumor of a separate battery originates...

The "rumor" originates from the drawings, schematics, and replacement instructions at hyundaitechinfo.com and kiatechinfo.com. Study the post 9 drawings in the other thread. You'll see the 12V battery. Can't miss it.

 

Locked out of my plugged-in but dead brand new 2025 Hyundai Tucson N-line after not driving for awhile. Thanks to everyone for posting, I obviously have a drain too. Can't get into dealership service department for a week! Very frustrated with this new car being less reliable in terms of the 12v battery than the junker I replaced. Also remote start from fob doesn't work, it won't let me set a digital key, the AEB light comes on randomly and the roof makes a flapping noise when a back window is open. Very disappointing.

 

Reporting in on the same issue for a 2025 Tucson AWD SEL ICE (non-hybrid) here in the US.

I have narrowed this down to an issue with leaving the car unlocked, and then returning to the car after 5-10 minutes of it being left in that unlocked state.

It is easy to replicate the issue:

• After turning off the car, leave the doors unlocked
• Return within 5-10 minutes (as soon as the Bluelink app gives you notification that your doors are unlocked)
• Open and close any door - including hood or trunk hatch
• You will see your push-button ignition and drivers' side USB port are lit up, and will remain on untli your 12V battery is dead (usually 1-2 days at most)

The only way to clear this condition is to do an ignition cycle (accessory, run, off) and then quickly lock your car with the fob or door handle touchless control within 5 minutes or so of the vehicle being off.

I asked dbest to post that Hyundai Canada 24-22 TSB for us in the states which he said is instructing dealers in Canada to remove fuse #17 (wireless DCU/data connectivity unit) until a permanent fix is made available. as there may be a "logic error in the CCU (central communication unit) and may be triggered by wireless communication." from his original post.

This issue persists no matter if you have multiple user profiles, automatic A/C fan turned on, key fobs near/away, or the digital key enabled. It appears completely unrelated.

 

My Tucson 2025 Hybrid is only 2 months old! Always plugged in under 15⁰C. Battery dead after 7 days not being driven. Had to boost. Had to use restart (though door had to be shut and I had to stay freezing in vehicle with fob) to manually started after 36 hours not driven when it was in -30⁰C. Just dropped off at dealer for battery drain check etc. The service dealer was a rude old crank who tried to tell me I had to pay to put a battery extender on myself. She said all new cars are like this because the manufacturer can't know every ones different driving habits! What a load of crap! We'll see if this dealership in Saskatchewan will admit any issues when I pick up the vehicle this afternoon. This is complete crap. Happy to join the class action suit.

 

Update. Nothing was done by dealership to vehicle at this appointment. I did get to have a talk with a mechanic who said he was willing to work with me on it. What a nuisance. I also to reduce drain set the always being logged into Bluelink button to off on my phone. In vehicle set to off the back seat alert, and on phone I unsubscribed to Sirius radio. Monitoring is ongoing, sigh.

 

Update on my issue from my post #117 on this thread:

Ended up being an OTA/over-the-air software update that was "stuck" and caused the wireless DCU (cellular) module to stay on, thus drawing power. My radio actually showed it had an update available in the settings menu, but would give an error message if you tried to apply that update.

Radio software was manually updated by the dealer via their hardwired diagnostic tool (not OTA), but the issue could happen again if future OTA/over-the-air updates get hung up.

After this update to the radio software, the USB and ignition button lights now properly turn off automatically after 5 minutes following the trigger of a door opening/closing.

So far so good!

 

Thanks for the update very helpful.

 

bonjour j,ai le meme probleme avec tucson hybride avez vous trouvee une solution merci

 

Pas encore. Je n'utilise toujours pas de clé numérique.... Not yet. I am still not using digital key

 

merci

 

Are these problem about battery drainage only for the 2025 Tucson N-line in Canada only?

 

Got a call from Hyundai for service CAMPAIGN 40D250 /40D254. CCU software update. Does any know what this fixes?

 

At dealership now and this update fixes the battery drain issue.