Unexplained Total Battery Drain - Kia Niro Forum
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post #1 of 26 (permalink) Old 04-17-2018, 11:18 AM Thread Starter
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Unexplained Total Battery Drain

I had a problem last weekend with the battery system. Following a four hour drive and overnight parking, I returned to the Niro on Saturday to find it completely unresponsive. Lights are always on auto. Used the mechanical key to open the door and got no response when trying to start the engine. Using the battery reset button did not help. Got roadside assistance after a wait and the guy jump started the engine using Kia's prescribed method. Niro has driven and behaved fine since. Took it into dealer today (Tuesday) to see what the problem is and was surprised to learn that the car has no error codes or other indication that there was ever a problem. Service guys say everything checks out fine. Kia Customer Service says you only get error codes if the Check Engine light comes on which apparently doesn't happen if both batteries are dead.

Any idea what would cause this kind of behavior?
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post #2 of 26 (permalink) Old 04-17-2018, 08:52 PM
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Something that was using electricity in your absence. You knew that of course. There were a couple of known issues with the 2017 like a door handle/lock and a junction box, but I've not heard about much since. Could be very random never to happen again. More disturbing is your battery reset didn't work. I'd ask your dealer to leave the dome light on overnight and test that function. I'm sure they have already checked that static electrical drain is within spec.

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post #3 of 26 (permalink) Old 04-18-2018, 02:47 AM
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Could you have left the vehicle on?
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post #4 of 26 (permalink) Old 04-18-2018, 10:02 AM
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Might just not be a battery drain at all. Could be the sensor that checks battery level is bad.

From what I understand, draining a hybrid vehicles battery is a huge problem, the gauge on the dash that goes from 0 to 100% is actually closer to 50 - 80% because thats where the batteries like to live, less than that causes damage and more than that wouldn't allow the regenerative brakes to function.

My guess is a sensor, not the battery pack, but if it is the batteries, get ready for failure.
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post #5 of 26 (permalink) Old 04-19-2018, 11:29 PM
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I have read that leaving ANYTHING plugged in any of the usb ports or the 12V ports can drain the battery...........just a thought
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post #6 of 26 (permalink) Old 04-20-2018, 10:34 AM
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Don't think it would take much to fully drain the battery overnight. Even a single interior light could do that over a matter of hours. At least it doesn't seem like you need to spend any money on repairs, just try and keep a closer eye on what's being used when driving.
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post #7 of 26 (permalink) Old 04-21-2018, 09:19 AM
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The USB port powers off when you exit the car. However, the OBD2 port does not and I've experienced a misbehaving device that drained my battery. Fortunately the restore button worked.
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post #8 of 26 (permalink) Old 04-21-2018, 02:13 PM
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Go to your dealer. Any device left in USB port or power outlet could not discharge battery because all are disconnected when you turn off ignition.

However there was some repair action to replace BSI/GEM unit, which was described similar. Could cause battery drain. If I find some identifier will post it here. My dealer replaced this unit in mine car.
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post #9 of 26 (permalink) Old 04-21-2018, 10:11 PM
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Quote:
Originally Posted by wrzoch View Post
Go to your dealer. Any device left in USB port or power outlet could not discharge battery because all are disconnected when you turn off ignition.
My USB ports are not disconnected when the car is turned off. They do time out after 10 minutes or so, or when I exit the car.
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post #10 of 26 (permalink) Old 04-24-2018, 03:47 PM Thread Starter
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Thanks for all the suggestions. The only thing plugged in was a dashcam powered by the cigarette lighter port. The camera also has an auto-off feature. Car was definitely not left on when parked.

Dealer's only suggestion was to have it brought in via tow truck if the problem reoccurred and not to have it jumped off. I will mention your suggestions for possible failure points when I am next in for service.
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