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2018 Sorento EX: Battery Draining Overnight - Help!

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Jennifer H. · rep 0 · May 22, 3:09 AM · 1 replies · solved · Question

Vehicle: 2018 Kia Sorento EX

Hey everyone, I'm having a really frustrating issue with my 2018 Kia Sorento EX. For the past few weeks, the battery keeps dying overnight. I've had it jump-started multiple times, and it starts fine after a jump, but if it sits for more than 8-10 hours, it's completely dead again.

I had the battery tested at AutoZone, and they said it's good. The alternator also seems to be charging fine when the car is running. Could this be a parasitic draw? I'm not sure how to even begin looking for something like that. Any ideas on what could be causing this or how to diagnose it myself before taking it to a shop?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:09 AM

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ClearTheCode admin answer:

It sounds like your 2018 Kia Sorento EX is indeed experiencing a parasitic draw, where an electrical component continues to draw power even when the vehicle is turned off. While your battery and alternator tested good, a persistent draw will deplete even a new battery.

Common Causes of Parasitic Draw:

  1. Aftermarket Accessories: Non-OEM alarms, stereos, dash cams, or remote starters can sometimes be wired incorrectly and draw power constantly.
  2. Stuck Relays: A relay that's stuck in the 'on' position can keep a circuit active, such as for the interior lights, fuel pump, or infotainment system.
  3. Faulty Modules: Control modules (e.g., body control module, infotainment module) can sometimes fail and not enter 'sleep' mode, leading to a constant draw.
  4. Interior/Trunk Lights: A light that isn't turning off completely due to a faulty switch or sensor.
  5. Corrosion: Corroded wiring or connections can sometimes create unintended circuits.

When to See a Shop:

If you're not comfortable with electrical diagnostics, it's best to take your Sorento to a qualified mechanic or Kia dealership. They have specialized tools to perform a parasitic draw test accurately and efficiently. This involves connecting an ammeter in series with the battery and systematically pulling fuses to isolate the circuit causing the draw.

Potential OBD Codes (less common for direct parasitic draw, but related to low voltage):

  • P0562: System Voltage Low
  • P0563: System Voltage High (less likely, but can indicate charging system issues that might mask a draw)

DIY Initial Checks (if comfortable):

  1. Check for Visible Lights: Ensure all interior lights, trunk lights, and glove box lights are off when the doors are closed.
  2. Listen for Sounds: After turning off the car and locking it, listen for any faint humming or clicking sounds that persist, which could indicate a module or relay staying active.
  3. Disconnect Accessories: If you have any aftermarket accessories, try temporarily disconnecting them to see if the problem resolves.

Given the consistent overnight drain, a professional diagnosis will save you time and prevent further battery damage.

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