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2018 G80 Battery Draining Fast - Reliability Concern?

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Chris P. · rep 0 · May 22, 6:24 AM · 1 replies · solved · Question

Vehicle: 2018 Genesis G80 3.8

Hey everyone,

I'm a new owner of a 2018 Genesis G80 3.8 and I've been experiencing a really frustrating issue. It seems like the battery drains incredibly fast, especially if I don't drive the car for 2-3 days. I've had to jump-start it multiple times now, and it's becoming a major headache.

I've checked the obvious things like making sure all lights are off and nothing is left plugged into the USB ports. Is this a known reliability issue for the 2018 G80 model year? I'm wondering if there's a common culprit or if I should be looking into a specific part.

Any advice or shared experiences would be greatly appreciated before I take it into the dealership. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:24 AM

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ClearTheCode admin answer:

Battery drain issues, often referred to as parasitic draws, are a common concern across many vehicle makes, including the Genesis G80. While not necessarily a widespread recall item, certain modules or conditions can lead to excessive battery discharge. Here's a breakdown of potential causes and steps:

  1. Aging Battery: Even if it seems okay, a battery past its prime (typically 3-5 years) can lose its ability to hold a charge efficiently. Start by having your battery professionally tested with a load tester.

  2. Parasitic Draw: This is the most common cause of unexplained battery drain. It occurs when electrical components continue to draw power even when the vehicle is off. Common culprits in Genesis models can include:

    • Infotainment System Modules: Sometimes these modules don't fully shut down.
    • Telematics Unit (Genesis Connected Services): A faulty unit can continuously draw power.
    • Aftermarket Accessories: Anything added to the vehicle that taps into the electrical system.
    • Faulty Relays or Switches: A relay stuck in the 'on' position can keep a circuit active.
    • Alternator Diode Failure: A failing diode in the alternator can allow current to flow from the battery back into the alternator when the engine is off.

  3. Diagnostic Steps You Can Take:

    • Battery Test: As mentioned, get a professional battery health check. Many auto parts stores offer this for free.
    • Parasitic Draw Test (DIY with Multimeter): Disconnect the negative battery terminal and connect a multimeter in series between the terminal and the battery post. Set the multimeter to measure amperage. After allowing the vehicle to 'sleep' (can take 15-30 minutes for all modules to shut down), a normal draw should be around 20-50 milliamps (0.02-0.05 amps). If it's significantly higher, you have a draw. You can then pull fuses one by one to isolate the circuit causing the draw.
    • Check for TSBs: Visit a Genesis dealership or check online resources for Technical Service Bulletins (TSBs) related to battery drain for your 2018 G80. Sometimes software updates or specific component replacements are recommended.

  4. When to See a Shop:

    • If your battery tests fine and you're unable to pinpoint the parasitic draw yourself.
    • If the issue persists after replacing the battery.
    • If you suspect an alternator issue (e.g., if you see OBD-II codes like P0562 - System Voltage Low, or P0563 - System Voltage High, though these are less common for parasitic drain).
    • A professional technician has specialized tools and diagnostic software to identify module-specific draws and perform necessary software updates or repairs.
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