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2018 Discovery HSE Battery Draining Overnight - Help!

0

Emily N. · rep 0 · May 22, 6:32 AM · 1 replies · solved · Question

My 2018 Land Rover Discovery HSE has been having a persistent battery drain issue. If I leave it parked overnight, especially for more than 12 hours, the battery is completely dead in the morning. I've had to jump-start it several times this week, and it's getting really frustrating.

I recently replaced the battery, thinking that was the problem, but the new one is also draining. I've checked that all lights are off and nothing obvious is left plugged in. I'm worried it's something more serious like a faulty module. Could it be the infotainment system or something with the keyless entry? Any ideas on where to start looking to diagnose this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:32 AM

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ClearTheCode guidance (Land Rover · Electrical & electronics)

Summary: For 2018 Discovery HSE 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 2018 Land Rover Discovery HSE has been having a persistent battery drain issue. If I leave it parked overnight, especially for more than 12 hours, the battery is completely dead in the morning. I've had to jump-start it several times this week, and it's getting really frustrating.

I recently replaced the battery, thinking that was the problem, but the new one is also draining. I've checked tha…

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

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