Check the water levels. I had my 2011 sonata for two years and it started doing the same thing. You can look on line to see how to check and fill water levels. It's a really simple fix and cost the price of distilled water if you dont have any on hand.
It can be a number of problems one can be you have something is staying on it can be a light in the boot,you alarm is wired wrong or a radio is not off or it can be the battery no good. By jumping the car with a jumper leads can damage the battery, or you alternator is not charging good. First to check your alternator you will need a volt meter and place the negative from your meter to the negative of the batter and the positive to the positive and start your car. If the reading is 14.3 V to 14.8 V your alternator is good than the problem it can be any of the other things that I indicated
SOURCE: Hyundai Santa Fe battery dies after 2 days with no use
Hi, I have had similar intemittent dead\low battery problems with my 2008 CDX+.
The garage could never find anything wrong with the charging system, battery or drain. I bought a replacement battery, jump start power pack, battery tester and battery charger, in total costing hunders of pounds in an attempt to resolve the problem.
I was on the point of selling it when one day I heard the roof mounted DVD player making noises when I hadn't switched it on (I never switch it on). After disconnecting it the car started perfectly for months. After reconnecting it the issue came back, however I could never recreate the problem at the dealership as it was intermittent, and they had it for days. Eventually the DVD player took in a disc and refused to eject it. This was enough to have it replaced under warranty. Unfortunately the new one took about 4 months to come in and I have never recieved my disc back.
The new DVD player seems to have helped, however I can still report that in the 6 months or so since fitting I have had one of the new overhead bulbs blow and the battery has been dead on 2 occassions. The last occassion was yesterday and we had driven the car fine the day before.
I now carry the power pack in the car at all times, however as this is my wife's car she is concerned about being stranded with our new baby. My thoughts have once again turned to changing cars (new diesel auto crv 2010?) which is a shame as the Santa Fe ticks the boxes in so many other areas.
Hope this helps. ?
SOURCE: stereo problem with hyundai sonata 2000 after dead battery
After verifying all the connections to the radio are good (power and ground, antenna, speakers, etc), the audio unit has an internal malfunction. Solution: Replace the audio unit.
SOURCE: 2005 Hyundai Sonata cranks, no spark
usually the distributor MODULE
they are renound for this sort of drama
get the wiring checked aswell as it may be due to faulty charging & causing computor errors [I hope you didnt short out the battery when you changed it!!!! ]
SOURCE: Radio Reset for 2006 Hyundai Sonata
doubtful probably burnt up a component in radio thats why when jumping a vehicle u turn off all accessories so when something gets crossed it doesnt short it out usually will blow a couple of fuses
SOURCE: 2002 Hyundai Sonata "battery" light
The Alternator may not be charging at the proper level. If the car is running while you're trying to open the sunroof or turn on the defroster, then the battery light has nothing to do with those and they are separate problems. Have an ASE Certified mechanic check the charging system.
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