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2017 Optima Battery Drain Mystery - New Battery Still Dies

0

Emily N. · rep 0 · May 25, 2:10 AM · 1 replies · solved · Question

Hey everyone, I'm at my wit's end with my 2017 Kia Optima EX. For the past few weeks, the battery keeps dying overnight. I thought it was just an old battery, so I replaced it with a brand new one last weekend. Guess what? Same problem! Woke up this morning, and it was completely dead again.

I've checked the obvious things like lights being left on, but everything seems off. No interior lights, no trunk light, nothing. Could this be a parasitic draw? I don't have any aftermarket accessories installed, just the standard factory setup. It's really frustrating and I'm worried about getting stranded.

Has anyone else experienced this with their Optima or any other Kia? What should I be looking for? Any common culprits for phantom battery drains in these cars?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:10 AM

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ClearTheCode guidance (Kia · Electrical & electronics)

Summary: For 2017 Optima Battery Drain Mystery - New Battery Still Dies, work through these steps on your 2015+ 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: Hey everyone, I'm at my wit's end with my 2017 Kia Optima EX. For the past few weeks, the battery keeps dying overnight. I thought it was just an old battery, so I replaced it with a brand new one last weekend. Guess what? Same problem! Woke up this morning, and it was completely dead again.

I've checked the obvious things like lights being left on, but everything seems off. No interior lights, n…

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

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