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Persistent battery drain on my 2017 Jeep Cherokee Limited

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Mike T. · rep 0 · May 25, 2:23 AM · 1 replies · solved · Question

Vehicle: 2017 Jeep Cherokee Limited

Hello everyone, I'm at my wit's end with a persistent battery drain issue on my 2017 Jeep Cherokee Limited. I've replaced the battery twice in the last year, and it still dies if the car sits for more than a day or two. It's incredibly frustrating to wake up to a dead car.

I've checked the basics like making sure all lights are off and doors are closed. I don't have any aftermarket accessories installed. Could this be a parasitic draw from a module that isn't shutting down properly? What's the best way to track something like this down?

Are there any known issues with specific modules in the Cherokee that tend to stay awake and drain the battery? Any help or suggestions on how to diagnose this would be fantastic.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:23 AM

0

ClearTheCode admin answer:

A parasitic draw on a vehicle's electrical system, especially in modern Jeeps with numerous electronic modules, can be incredibly challenging to diagnose. Here's a systematic approach to finding and fixing the issue in your 2017 Jeep Cherokee:

  1. Confirm the Draw:

    • Action: Use a multimeter set to amps. Disconnect the negative battery terminal and connect the multimeter in series between the negative battery post and the negative battery cable. Ensure all doors are closed, and the vehicle has been 'asleep' for at least 30 minutes (modules take time to power down). A normal draw is typically under 50mA (0.05 Amps). Anything significantly higher indicates a problem.

  2. Fuse Pull Method:

    • Cause: This method helps isolate which circuit is causing the draw.
    • Action: Once you've confirmed a high draw, start pulling fuses one by one from the fuse box (both under the hood and inside the cabin), while watching the multimeter. When the amperage drops significantly, you've found the circuit responsible. This points you to the module or component on that circuit.

  3. Common Culprits for Parasitic Draws in Jeeps:

    • Radio/Uconnect Module: These can sometimes fail to power down correctly. (No specific OBD code, but pulling the relevant fuse will show the drop).
    • Body Control Module (BCM): The BCM controls many functions and can sometimes stay awake. (Again, fuse pull is key).
    • Door Lock Actuators: A faulty actuator can continuously try to lock/unlock, drawing power.
    • Alternator Diode Failure: A bad diode in the alternator can allow current to leak back to ground, draining the battery. This can be tested by disconnecting the main power wire from the alternator and re-checking the draw.
    • Glove Box/Vanity Mirror Lights: Ensure these are truly off when closed. A faulty switch can keep them on.
    • Aftermarket Accessories: Even if you don't think you have any, double-check any non-factory wiring.

When to See a Shop:

  • If you're uncomfortable working with electrical systems or don't have a multimeter.
  • If you've pulled all fuses and still can't find the source of the draw, indicating a problem with a main power feed, alternator, or a very obscure component.
  • If the draw is intermittent and hard to reproduce.
  • While there aren't direct OBD codes for a general parasitic draw, a shop can use advanced scan tools to check for modules that are reporting as 'awake' when they should be asleep, which can help pinpoint the issue.
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