Have they kept it overnight to see if they can verify the problem? That would be a logical next step. Make sure you keep good records.

 

Yeah they had it over night the first time and the second time for five days. Of course it doesn't happen when it's there haha. But they said it doesn't die and there is nothing on the diagnostic

 

Please don't take offense to this question, but are you certain you are shutting down your car properly? If so, there are several things you can try to see if there is some type of parasitic draw making your battery die. Do this before shutting down for the night: 1. Turn your headlights to the off position. 2. Turn off all courtesy lights. 3. Put your key fobs as far away from your car as possible, maybe in a metal box. 4. Turn your infotainment system and hvac system off before you shut your car down. 5. Before you shut your car down for the night, drive for a few minutes in sport mode, preferably on the highway until the battery gauge reads at least 3/4 charge, preferably to as high as you can get it. Lock your car before you leave it for the night. Take note of the state of charge at shut down and again in the morning. Importantly, take photos of the state of charge so you can document the battery draw overnight. If there is a draw, eliminate one of the first 4 suggestions at a time over a 4 day period to see if it affects the state of charge. I know it is a lot, but Hyundai isn't helping you at all. At least if you can document the rate of discharge overnight, you can prove your point. My guess is if you fully charge the traction battery before shutting down for the night, your state of charge will go down, but maybe not enough to prevent you from starting. If it won't start even after fully charging, you likely have a defective battery.

 

use the hybrid batt reset button.

also, i believe the 12v batt is a section of the larger hybrid batt. how have u been solving the issue thus far?

 

I have to use the 12volt restart button everytime

 

Thank you those are some helpful tips and I will try this out

 

Any of those automatic features could be malfunctioning , causing a battery draw, including the key fob, which sends signals to the car. Manually disabling them can't hurt in a process of elimination. Running the car in sport mode will provide a fully charged traction battery to start with. That way, checking the state of charge before and after will be more accurate. If you start with a low traction battery, you are less likely to see how much power is drawn overnight before the traction battery disconnects from the 12 volt system. I agree that something is wrong with the car. These suggestions are a way to collect data to show Hyundai that something is wrong. They had it for 5 days and couldn't find anything. Collecting data proving an overnight battery drain will prove to Hyundai something is wrong. One extra data point I would suggest would be to take video on startup to prove that the car isn't starting. They say the defintion of insanity is doing the same thing over and over and expecting a different result. At least i am suggesting something different, and explain here my reasoning.

 

Agreed and I appreciate all the tips and I. Going to try them for sure !

 

Hey! Obviously something is draining your battery. I have not gone through a full draining but on mine, I had the radiator fan staying on after the vehicule is turned off for long time. I'm actually trying to figure out what is going on. Wasn't able to reproduce this today. When the fan stays on, I know how to turn it off...(just plugging the vehicule on charge and it stops right away, Mine is a PHEV). The other method that worked for me is having the fan running for 10-15 minutes, restarting the car and turning it off after a few seconds. Seems to reset the sensors or something...

You don't have anything to lose. When you turn off the car, go close to the front bumper and listen, if the fan is not blowing, then you can eleminate the fan if your battery dies again...If it stays on, try coming back every 5 minutes.....
If it doesn't turn off, it might be the thing draining your battery. Generally, this is bad relay or sensor...

 

Hi there! I just came upon your post and can commiserate with you. I purchased my 2022 Tucson Luxury Hybrid on July 11th, 2022 - it had 56 km on it (I'm from Toronto, ON Canada). I drove it home. The next morning, the car was dead, the key fobs wouldn't even work. I called the dealership where I purchased the vehicle, they told me to call Roadside assistance (not a very helpful and/or ethical car dealership - Queensway Hyundai - I have since filed a complaint with Hyundai Canada). Roadside assistance came and boosted the battery, the car was drivable but only for that one time/trip. The next morning same issue, a dead battery, this time the dealership wouldn't even take my calls. I had to call roadside assistance again - they came and boosted the vehicle, after which I promptly drove to the nearest Hyundai dealership (not Queensway). That was on July 13th, 2022, and that is where the vehicle was until October 27th, 2022, it registered 64 km on the odometer. I was told that there was a faulty battery module and because of supply chain delays, the part was unavailable in Canada - it needed to be manufactured and delivered from Korea. So, the battery module finally arrived at the dealership sometime around the 25th of October. After a couple of days of testing the car, the dealership had me pick up my vehicle. But this was not a happy ending - my car is back at the dealership for the same problem, a dead battery. I drove the car around and then home on the 25th of October, it had about 105 km on the odometer. I did not start the vehicle the following day but when I went to start it up on the 27th of October, it was dead! I called the repairing dealership; they immediately told me to call Roadside assistance and bring the car back to them for inspection (this is a very conscientious dealership, unlike the Queensway folks). Well, here I am on the 2nd of November, my car has been at the repairing dealership (for the second time) since last Saturday (the 27th October). Their mechanics have escalated my car's case to "high" technical services because they don't know what is wrong or how to fix it. To summarize: I have owned the 2022 Tucson Luxury Hybrid since July 11th, 2022, but I have only driven it 4-5 times - mostly to and from dealerships - and it only has 120 km registered on its odometer. This car has been sitting at a Hyundai service centre for months rather than in my possession.