If your doors won't unlock and your car won't start, the 12v battery is faulty/dead Even if you have very low miles on the car. It seems the original calcium 12v battery is of very poor quality - other forum members had the same problem. Be sure to have the Utility Mode to ON
I suggest, when parking car inside garage, always double click the fob to lock it and shut off all computers. If left unlocked, computers may keep running background, forcing constant drain and recharge on the 12V which is powering everything except the motor.
The original 'Rocket' battery is lead-calcium. Hyundai may be replacing it with a regular lead-acid one. I suggest removing the fuse for the AMS battery temperature sensor, if using a lead-acid battery, it may help keeping the charging voltage to a better voltage for the acid-lead battery
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8 сен 2024