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2020 Enclave Battery Draining Overnight - Help!

0

Ashley M. · rep 0 · May 22, 3:52 AM · 1 replies · solved · Question

My 2020 Buick Enclave Premium has been having a strange issue lately. If I leave it parked overnight, especially for more than 12 hours, the battery is completely dead in the morning. I've had it jumped a few times, and it starts fine, but the problem keeps coming back.

I had the battery tested at AutoZone, and they said it's good. Could it be a parasitic drain? What should I even look for? This is a relatively new car, and it's frustrating.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:52 AM

0

ClearTheCode guidance (Buick · Electrical & electronics)

Summary: For 2020 Enclave Battery Draining Overnight - Help!, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: My 2020 Buick Enclave Premium has been having a strange issue lately. If I leave it parked overnight, especially for more than 12 hours, the battery is completely dead in the morning. I've had it jumped a few times, and it starts fine, but the problem keeps coming back.

I had the battery tested at AutoZone, and they said it's good. Could it be a parasitic drain? What should I even look for? This …

This is educational guidance, not a substitute for hands-on diagnosis.

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