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2017 Optima EX Battery Dies Overnight - Parasitic Draw?

0

Mike T. · rep 0 · May 25, 2:10 AM · 1 replies · solved · Question

Vehicle: 2017 Kia Optima EX

My 2017 Kia Optima EX keeps dying overnight. I've replaced the battery twice in the last year, and the alternator was checked and seems fine. It starts perfectly after a jump, but if it sits for 8-10 hours, it's completely dead again.

I've tried unplugging my phone charger and other minor accessories, but no luck. There are no obvious lights left on inside the car. It's really frustrating and I'm tired of needing a jump every morning.

Any ideas what could be draining it? Could it be a faulty module or something more obscure?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:10 AM

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ClearTheCode admin answer:

A parasitic draw is a common culprit when a battery repeatedly dies. This occurs when an electrical component continues to draw power even after the vehicle is turned off. Diagnosing it can be tricky but is often manageable with a multimeter.

Here's how you might approach it:

  1. Perform a Parasitic Draw Test:

    • Ensure all doors are closed, lights are off, and accessories are unplugged. Let the car sit for 15-30 minutes to allow all modules to 'sleep'.
    • Disconnect the negative battery terminal.
    • Connect a multimeter in series between the negative battery post and the disconnected negative battery cable. Set the multimeter to measure amperage (amps).
    • A normal draw should be around 20-50 milliamps (0.02-0.05 amps). If it's significantly higher, you have a draw.

  2. Isolate the Circuit:

    • While the multimeter is connected and showing a high draw, systematically pull one fuse at a time from the fuse box (both under the hood and inside the cabin). Watch the multimeter reading. When the amperage drops significantly, you've found the circuit with the draw.

  3. Common Culprits for Kia Optimas:

    • Glove Box/Trunk Lights: These can sometimes stay on if the switch is faulty.
    • Aftermarket Accessories: Anything wired in after the factory can cause issues.
    • Faulty Audio/Infotainment Module: These can sometimes fail to power down completely.
    • Door Lock Actuators: A faulty actuator can keep a circuit active.
    • Relays: A stuck relay can keep a component energized.

When to See a Shop: If you're uncomfortable performing electrical tests, or if you've identified a circuit but can't pinpoint the exact component, it's best to take your Optima to a qualified mechanic. They have specialized diagnostic tools and expertise to trace complex electrical issues and can check for specific technical service bulletins (TSBs) related to parasitic draws on your model year.

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