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2020 Outlander ES - Battery Draining Overnight, No Obvious Cause

0

Rachel A. · rep 0 · May 22, 5:35 AM · 1 replies · solved · Question

Hey everyone,

I'm having a really frustrating issue with my 2020 Mitsubishi Outlander ES. For the past few weeks, the battery keeps dying overnight or after sitting for more than 12 hours. I've had to jump-start it multiple times, and it's getting old fast. The battery itself is only about a year old, and I had it tested at AutoZone, and they said it's good and holds a charge.

I've checked the obvious things like making sure all the lights are off, doors are fully closed, and nothing is plugged into the accessory ports. I don't have any aftermarket stereo equipment or anything unusual installed. The car drives fine once it's started, and there are no warning lights on the dash.

Could this be a faulty module or some kind of parasitic draw? I'm not super handy with electrical diagnostics, but I'm willing to try some basic troubleshooting if anyone has suggestions. Any ideas on what might be causing this persistent drain on my Outlander?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:35 AM

0

ClearTheCode guidance (Mitsubishi · Electrical & electronics)

Summary: For 2020 Outlander ES - Battery Draining Overnight, No Obvious Cause, 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: Hey everyone,

I'm having a really frustrating issue with my 2020 Mitsubishi Outlander ES. For the past few weeks, the battery keeps dying overnight or after sitting for more than 12 hours. I've had to jump-start it multiple times, and it's getting old fast. The battery itself is only about a year old, and I had it tested at AutoZone, and they said it's good and holds a charge.

I've checked the o…

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

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