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Mysterious Battery Drain on 2020 Ford Explorer XLT

0

Brian F. · rep 0 · May 22, 2:26 AM · 1 replies · solved · Question

Vehicle: 2020 Ford Explorer XLT

Hi all,

I'm having a persistent issue with my 2020 Ford Explorer XLT. If I leave it parked for more than 24-36 hours, the battery is completely dead. I've had the battery tested at two different auto parts stores, and they both say the battery itself is good and holds a charge.

I'm suspecting a parasitic draw, but I'm not sure where to start looking. I've checked for lights left on, but everything seems to be off. Could it be a module staying awake or something similar? It's really inconvenient to have to jump-start it every other day.

Any tips on how to diagnose this or common culprits for battery drain in these Explorers would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:26 AM

0

ClearTheCode admin answer:

A parasitic draw can be incredibly frustrating to diagnose, but it's a common cause of dead batteries. Here's a systematic approach to find the culprit in your 2020 Ford Explorer XLT:

  1. Perform a Parasitic Draw Test:

    • Ensure all doors are closed, lights are off, and the key is out of the ignition. Wait at least 30 minutes for all modules to 'go to sleep.'
    • Disconnect the negative battery terminal.
    • Connect a multimeter in series between the negative battery post and the negative battery cable. Set the multimeter to measure Amps (A). A normal draw should be under 50mA (0.05A).

  2. Fuse Pull Method:

    • While the multimeter is connected and showing a high draw, start pulling fuses one by one from the fuse boxes (under the hood and inside the cabin). Watch the multimeter reading. When the amperage drops significantly, you've found the circuit with the draw.
    • Common circuits for parasitic draws include:
      • Infotainment/Sync System: A module not shutting down properly.
      • Door Ajar Switches: A faulty switch can keep interior lights or modules active.
      • Glove Box/Trunk Lights: Often overlooked, these can stay on.
      • Aftermarket Accessories: Anything wired directly to the battery.
      • Body Control Module (BCM): A faulty BCM can prevent other modules from sleeping.

  3. Check for OBD Codes: Even without a Check Engine Light, some modules might store 'soft' codes related to power management or communication issues that could point to a problem.

When to See a Shop:

  • If you're uncomfortable performing electrical tests yourself.
  • If you've pulled all fuses and still can't find the source of the draw.
  • If the draw is traced to a complex module (like the BCM or infotainment system) that requires specialized diagnostic tools or programming to replace.
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