Accidentally put the battery in backwards

2006 HYUNDAI SONATA
154,645 MILES • 3.3L • V6 • AUTOMATIC
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RUDEBOY18
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The car will only start if I give it a jump start. When I remove the cables it shuts off. I saw on YouTube it could be a fuse. Also my heating and A/C don't turn on. Any advice would be appreciated. thank you.
Sep 29, 2019 at 3:09 PM
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KASEKENNY
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Hi,

There could be blown fuses however, when this happens you basically put the voltage backwards through the circuit. So it goes through the ground and the first thing it goes through is the control module or the switch then gets to the fuse. So the more likely failure is the various modules or switches that the current passes through.

Unfortunately you need to treat this like a lightening strike. If you have something that is not working like the HVAC is not working then you need to check the fuse for it then the power and ground for the module. If they check out then you will need to replace the module.

Let me know if you need more info and we can go from there. Thanks.
Sep 30, 2019 at 5:41 PM