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2018 Grand Cherokee Battery Drain & ESS Not Working

0

Jason D. · rep 0 · May 22, 3:24 AM · 1 replies · solved · Question

Hey everyone,

I've been having a persistent issue with my 2018 Jeep Grand Cherokee Limited. The battery keeps dying if the car sits for more than a day or two. I've had it jumped multiple times, and even replaced the main battery, but the problem persists.

On top of that, the Engine Stop/Start (ESS) system hasn't been working for months. It always says 'ESS Not Ready' or 'Battery Charging' even after long drives. I suspect these issues might be related to a parasitic draw or a problem with the charging system. Has anyone experienced this with their Grand Cherokee?

Any tips on where to start looking would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:24 AM

0

ClearTheCode guidance (Jeep · Electrical & electronics)

Summary: For 2018 Grand Cherokee Battery Drain & ESS Not Working, 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've been having a persistent issue with my 2018 Jeep Grand Cherokee Limited. The battery keeps dying if the car sits for more than a day or two. I've had it jumped multiple times, and even replaced the main battery, but the problem persists.

On top of that, the Engine Stop/Start (ESS) system hasn't been working for months. It always says 'ESS Not Ready' or 'Battery Charging' even …

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

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