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2020 Enclave Battery Keeps Dying Overnight

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Mike T. · rep 0 · May 25, 2:46 AM · 1 replies · solved · Question

Vehicle: 2020 Buick Enclave Premium

Hey everyone, I'm pulling my hair out with my 2020 Buick Enclave Premium. For the past few weeks, the battery keeps dying overnight if I don't drive it daily. I've already replaced the battery with a brand new one, thinking that was the issue, but it's still happening.

I've checked to make sure all lights are off and doors are closed properly. It's really frustrating to wake up to a completely dead car. Has anyone experienced a parasitic draw or similar electrical issue with their Enclave? Any advice on where to start looking would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:46 AM

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ClearTheCode admin answer:

It sounds like your 2020 Buick Enclave Premium is suffering from a parasitic draw, which means something is still consuming power even when the vehicle is off. This is a common issue that can be tricky to diagnose but is definitely fixable.

Here's a breakdown of steps and potential causes:

  1. Perform a Parasitic Draw Test:

    • Connect a multimeter in series between the negative battery post and the negative battery cable. Ensure the vehicle is completely off and all doors are closed (you might need to trick the latch). Wait at least 15-30 minutes for all modules to 'go to sleep'.
    • A normal draw is typically under 50 milliamps (0.05 amps). If it's higher, you have a draw.
    • Start pulling fuses one by one while monitoring the multimeter. When the draw drops significantly, you've found the circuit responsible.

  2. Common Causes for Buick Enclave Parasitic Draws:

    • Infotainment System/Radio: Sometimes the head unit doesn't fully shut down.
    • Body Control Module (BCM): A faulty BCM can sometimes stay awake and drain the battery.
    • Door Ajar Switches: A faulty switch can make the car think a door is open, keeping interior lights or modules active.
    • Aftermarket Accessories: Any non-factory installed electronics (dash cams, remote starters) can be a culprit.
    • HVAC Blower Motor Resistor: Can sometimes fail in a way that causes a constant draw.

  3. When to See a Shop:

    • If you're uncomfortable performing the parasitic draw test yourself or can't pinpoint the circuit.
    • If the issue points to a complex module (BCM, infotainment) that requires specialized diagnostic tools or programming.
    • If the draw is intermittent or difficult to reproduce. A professional shop with advanced diagnostic equipment can often identify these elusive issues more efficiently.
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