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2019 Tahoe - Battery Dies Overnight (Parasitic Draw)

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Mike T. · rep 0 · May 25, 1:41 AM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Tahoe LT

Hello everyone, I own a 2019 Chevrolet Tahoe LT, and I'm experiencing a really frustrating problem: my battery keeps dying overnight.

If I don't drive it for 12-24 hours, the battery is completely dead and I need a jump start. I've already replaced the battery, thinking that was the issue, but the new one is doing the exact same thing.

This points to a parasitic draw, but I have no idea where to even begin looking. Has anyone had similar issues with their Tahoe or other Chevy models? What are the common culprits for this kind of battery drain?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:41 AM

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ClearTheCode admin answer:

A parasitic draw is definitely the most likely cause when a new battery dies overnight in your 2019 Chevrolet Tahoe LT. This means something in the vehicle's electrical system is drawing power even when the vehicle is off and all accessories are supposed to be shut down.

Diagnostic Steps (Requires a Multimeter):

  1. Verify Draw: Connect a multimeter in series between the negative battery post and the negative battery cable. Ensure all doors are closed, lights off, and the vehicle has been 'asleep' for at least 15-30 minutes (modules can take time to power down). A normal draw is typically under 50 milliamps (0.05 amps). Anything significantly higher indicates a problem.
  2. Fuse Pull Method: Once you've confirmed a high draw, start pulling fuses one by one (both under the hood and inside the cabin) while monitoring the multimeter. When the amperage drops significantly, you've identified the circuit causing the draw.
  3. Check Common Culprits: Pay close attention to fuses for the infotainment system, BCM, OnStar, door modules, glove box lights, under-hood lights, and aftermarket accessories.

Common Causes for Parasitic Draw in Tahoes/GM Trucks:

  • Infotainment System/Radio: The head unit or amplifier sometimes fails to power down completely.
  • OnStar Module: A faulty OnStar module can stay active and drain the battery.
  • Body Control Module (BCM): The BCM controls many electrical functions and can sometimes malfunction, preventing proper shutdown.
  • Door Lock Actuators/Window Motors: Sticky or faulty actuators can keep a circuit active.
  • Glove Box/Console/Under-Hood Lights: A light that stays on due to a faulty switch or latch.
  • Aftermarket Accessories: Anything wired into the vehicle (remote start, dash cam, stereo) can be a source if installed incorrectly.

When to See a Shop: Diagnosing a parasitic draw can be time-consuming and requires patience and a good understanding of electrical systems. If you're uncomfortable with electrical testing or can't locate the source after checking common areas, it's highly recommended to take your Tahoe to a professional mechanic or a dealership. They have advanced diagnostic equipment and experience with these specific issues to quickly pinpoint and resolve the draw without damaging sensitive electronics.

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