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2017 G90 5.0L battery dying overnight - parasitic draw suspected

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Mike T. · rep 0 · May 25, 4:40 AM · 1 replies · solved · Question

Vehicle: 2017 Genesis G90 5.0L Ultimate

My 2017 Genesis G90 5.0L Ultimate keeps having its battery die overnight or after sitting for a day or two. It's incredibly frustrating to find a dead car in the morning.

I've already replaced the battery once with a brand new one, thinking that was the problem, but the issue persists. This leads me to believe there's something draining the battery while the car is off.

Could this be a parasitic draw? What are common culprits for this in a luxury car like the G90, and how can I or a mechanic diagnose it?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:40 AM

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ClearTheCode admin answer:

Experiencing a dead battery repeatedly, especially after replacing it, is a strong indicator of a parasitic draw on your 2017 Genesis G90 5.0L. This means an electrical component is continuously drawing power even when the vehicle is turned off.

  1. Understanding Parasitic Draw:

    • All modern cars have a small, normal parasitic draw for things like the clock, radio memory, and alarm system. However, an excessive draw indicates a fault.
    • The acceptable draw is typically under 50 milliamps (0.05 amps) after the vehicle has 'gone to sleep' (all modules have powered down, which can take 15-30 minutes).

  2. Common Culprits in Luxury Vehicles like the G90:

    • Infotainment System/Navigation: A module failing to shut down properly can be a significant draw.
    • Bluetooth Modules: Similar to infotainment, these can sometimes stay active.
    • Power Seats/Mirrors/Windows: Faulty switches or modules that control these features can sometimes remain energized.
    • Trunk or Glove Box Light: A light that stays on due to a faulty switch.
    • Aftermarket Accessories: Anything added to the car (remote start, alarm, dash cam, stereo upgrades) can be a source if wired incorrectly or malfunctioning.
    • Faulty Relays: A relay that sticks in the 'on' position can keep a circuit powered.
    • Door/Hood Ajar Switches: If a switch is faulty, the car might think a door is open, keeping interior lights or other modules active.
    • Alternator Diode Failure: A failing diode in the alternator can create a circuit that drains the battery.

How to Diagnose (DIY/Shop):

  • Multimeter Test: A skilled DIYer can perform a parasitic draw test using a multimeter. This involves disconnecting the negative battery terminal, connecting the multimeter in series between the terminal and the battery post, and then pulling fuses one by one while monitoring the amperage draw. When the draw significantly drops, you've found the circuit.

When to See a Shop: Given the complexity of the G90's electrical system, it's highly recommended to have a professional technician diagnose this. They have specialized tools and diagnostic software to pinpoint the exact module or circuit causing the excessive draw more efficiently. They can also check for any relevant TSBs related to battery drain for your specific model year. This is not an issue you want to leave unresolved, as it can damage your new battery and other electrical components over time.

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