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2018 Enclave Battery Drain Mystery - New Battery Still Dies!

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Eric V. · rep 0 · May 22, 3:51 AM · 1 replies · solved · Question

Vehicle: 2018 Buick Enclave Premium

Hey everyone,

I'm pulling my hair out with my 2018 Buick Enclave Premium. About a month ago, the battery died completely. I figured it was just old, so I replaced it with a brand new one. Everything was fine for a couple of weeks, but now it's happening again – if I leave it parked for more than 24-36 hours, the battery is completely dead. I have to jump it every time.

I've checked the obvious things like lights being left on, but nothing. No aftermarket accessories installed either. It's really frustrating, especially since it's a relatively new battery. Has anyone experienced a parasitic draw issue with their Enclave? What could be causing this?

When I did get it started after the last drain, I scanned it and got a P0562 code, which points to low system voltage. Any advice on where to start looking would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:51 AM

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ClearTheCode admin answer:

It sounds like your 2018 Buick Enclave Premium is indeed suffering from a parasitic draw, which is a common issue that can be tricky to diagnose. The P0562 code (System Voltage Low) strongly supports this, indicating the battery isn't holding its charge or isn't being charged properly.

Here's a breakdown of potential causes and steps:

  1. Confirm Parasitic Draw:

    • Test: With the vehicle off and all doors closed (wait 15-30 minutes for modules to 'sleep'), disconnect the negative battery terminal. Connect a multimeter in series between the negative battery post and the disconnected negative cable, set to measure amperage (mA or A). A normal draw is typically under 50mA. If it's significantly higher, you have a draw.
    • Isolate: Start pulling fuses one by one while monitoring the multimeter. When the amperage drops significantly, you've found the circuit causing the draw.

  2. Common Culprits for Buick Enclaves:

    • Infotainment System/Radio: These modules can sometimes fail to power down correctly.
    • Body Control Module (BCM): A faulty BCM can keep various systems active.
    • OnStar/Telematics Module: These modules are always 'listening' but can sometimes malfunction and draw excessive power.
    • HVAC Blower Motor Resistor: Can sometimes stay partially active.
    • Glove Box/Trunk Lights: Ensure these are turning off when closed.
    • Alternator Diode Failure: A failing diode in the alternator can allow current to flow from the battery to the alternator even when the engine is off, effectively draining the battery. This can also cause the P0562 code.

  3. When to See a Shop:

    • If you're uncomfortable performing the multimeter tests or can't pinpoint the circuit, it's best to take your Enclave to a qualified mechanic or a Buick dealership. They have specialized diagnostic tools (like thermal cameras to spot warm modules) and experience with these types of issues. They can also perform a more thorough alternator test to rule out internal failure. Addressing this promptly will prevent further battery damage and ensure reliable starting.
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