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2020 Kona battery keeps dying, parasitic draw?

0

Mike T. · rep 0 · May 24, 1:22 PM · 1 replies · solved · Question

Vehicle: 2020 Hyundai Kona SEL

Hey everyone,

I'm having a super frustrating issue with my 2020 Hyundai Kona SEL. For the past month or so, if I leave it parked for more than 2-3 days, the 12V battery is completely dead. I've had to jump it multiple times now.

I had the battery tested at AutoZone, and they said it's good, holding a charge fine after it's been running. The alternator also tested fine. It seems like something is draining the battery while the car is off.

Has anyone else experienced this with their Kona or another Hyundai? Any ideas on what could be causing a parasitic draw? I'm trying to avoid an expensive diagnostic at the dealer if it's something I can check myself.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 1:22 PM

0

ClearTheCode admin answer:

A parasitic draw is a common issue where an electrical component continues to draw power from the battery even when the vehicle is turned off. This can lead to a dead battery over time.

Here's what you can investigate:

  1. Confirm the Draw:

    • Ensure all lights (dome, glove box, trunk) are off when doors are closed.
    • Check for aftermarket accessories (dash cams, remote starters) that might be wired improperly.
    • Listen for any sounds after the car is off and locked (e.g., cooling fans, relays clicking).

  2. Basic Diagnostics (Requires a Multimeter):

    • Safety First: Disconnect the negative battery terminal. Connect your multimeter in series between the negative battery post and the negative battery cable (set to Amps, typically 10A or 20A range).
    • Establish Baseline: After connecting, wait 15-30 minutes for all modules to 'go to sleep.' A normal parasitic draw should be under 50 milliamps (0.05 amps). If it's higher, you have a draw.
    • Fuse Pull Test: With the multimeter connected, 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. Consult your owner's manual for fuse diagrams.

  3. Common Culprits in Hyundai Vehicles (2016-2026):

    • Infotainment System/Radio: Sometimes the head unit doesn't fully shut down.
    • Telematics Unit (Blue Link): Issues with the Blue Link module can keep it active.
    • Relays: A stuck relay can keep a circuit energized.
    • Door Lock Actuators: Faulty actuators can keep drawing power.
    • Alternator Diode Leak: Although less common if the alternator tested 'good,' a leaking diode can cause a draw.

When to See a Shop: If you're uncomfortable performing electrical tests, or if you can't isolate the draw with the fuse pull test, it's best to take your 2020 Hyundai Kona SEL to a qualified automotive technician. They have specialized diagnostic tools (like thermal cameras or advanced scan tools) that can pinpoint the exact module or component causing the issue much faster and safer. Mentioning the "parasitic draw" will help them narrow down their diagnostic approach.

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