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Persistent Battery Drain on my 2018 Genesis G80 - parasitic draw?

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Jennifer H. · rep 0 · May 22, 6:20 AM · 1 replies · solved · Question

Vehicle: 2018 Genesis G80 3.8

Hey everyone,

I'm having a really frustrating issue with my 2018 Genesis G80 3.8. For the past few weeks, the battery keeps dying overnight or after sitting for just a day or two. I've already replaced the battery with a brand new one, thinking that was the problem, but it's still happening.

I've had to jump-start it multiple times, and it's getting old fast. It seems like there's something constantly drawing power, even when the car is off. I don't have any aftermarket accessories installed, and I've checked the obvious things like lights being left on.

Has anyone else experienced a parasitic draw on their Genesis G80? What were the common culprits you found? Any advice on how to diagnose this myself before taking it to the dealership would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:20 AM

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ClearTheCode admin answer:

Persistent battery drain, often referred to as a parasitic draw, is a common and frustrating issue. It means something is consuming power even when the vehicle is turned off. Here's how to approach diagnosing and resolving it:

  1. Initial Checks:

    • Ensure all interior lights (glove box, trunk, vanity mirrors) are off when doors/trunk are closed. Sometimes a faulty switch can keep a light on.
    • Check for any aftermarket accessories (dash cams, chargers) that might be hardwired and drawing power.

  2. Diagnosing Parasitic Draw with a Multimeter:

    • Safety First: Disconnect the negative battery terminal first. Then, connect a multimeter in series between the negative battery post and the disconnected negative battery cable. Set the multimeter to measure amperage (amps).
    • Baseline Reading: After connecting, wait about 20-30 minutes for all vehicle modules to 'go to sleep.' A normal parasitic draw should be less than 50 milliamps (0.05 amps). If it's significantly higher, you have a draw.
    • Fuse Pull Method: While monitoring the multimeter, systematically pull one fuse at a time from the fuse box (both under the hood and inside the cabin). When the amperage drops significantly, you've identified the circuit causing the draw. Refer to your owner's manual for fuse diagrams.

  3. Common Causes for Genesis Models:

    • Infotainment/Navigation Module: These modules can sometimes fail to power down correctly, leading to a constant draw. This is a known issue in some luxury vehicles.
    • Faulty Relays: A stuck relay can keep a circuit active. Common culprits include fuel pump relays, accessory relays, or even starter relays.
    • Alternator Diode Failure: A failing diode in the alternator can allow current to flow back to the alternator when the engine is off, draining the battery.
    • Door Lock Actuators/Switches: A faulty door switch or actuator might keep a module awake, thinking a door is ajar.
    • Blind Spot Monitoring (BSM) or Parking Sensor Modules: These can sometimes develop internal faults that cause a draw.

  4. When to See a Shop:

    • If you're uncomfortable performing electrical diagnostics yourself, or if you can't pinpoint the exact circuit after pulling fuses, it's best to take your 2018 Genesis G80 to a qualified automotive technician or a Genesis dealership. They have specialized diagnostic tools (like scan tools that can monitor module sleep states) that can quickly identify the faulty component. They can also check for relevant OBD-II codes, though parasitic draws don't always trigger specific codes unless a module completely fails or causes a low voltage condition (e.g., P0562 - System Voltage Low).
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