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2019 Wrangler JL ESS Not Working & Intermittent Battery Light

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Melissa G. · rep 0 · May 22, 3:26 AM · 1 replies · solved · Question

My 2019 Jeep Wrangler JL Sahara has been acting up lately. The Engine Stop-Start (ESS) system stopped working a few weeks ago, and now I'm getting an intermittent battery light on the dash. Sometimes it cranks a bit slow too.

I had the main battery tested at AutoZone, and they said it was okay, but I'm not so sure. Could it be the auxiliary battery or something else entirely? It's really frustrating to have these electrical gremlins.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:26 AM

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ClearTheCode guidance (Jeep · Electrical & electronics)

Summary: For 2019 Wrangler JL ESS Not Working & Intermittent Battery Light, 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 2019 Jeep Wrangler JL Sahara has been acting up lately. The Engine Stop-Start (ESS) system stopped working a few weeks ago, and now I'm getting an intermittent battery light on the dash. Sometimes it cranks a bit slow too.

I had the main battery tested at AutoZone, and they said it was okay, but I'm not so sure. Could it be the auxiliary battery or something else entirely? It's really frustrat…

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

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