The largest online repair guide library for every car

About us
Contact support
FAQ
Sign up
Sign in

2018 Enclave Battery Draining Fast - "Service Charging System" Light

0

Angela R. · rep 0 · May 22, 3:50 AM · 1 replies · solved · Question

My 2018 Buick Enclave Premium has been having battery issues lately. Over the past few weeks, the battery seems to drain overnight, and I've had to jump-start it a few times. The "Service Charging System" light also came on last week.

I had the battery tested at AutoZone, and they said it was good, but the charging system might be the problem. I'm worried about getting stranded. Has anyone else experienced this with their Enclave? What could be causing this?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:50 AM

0

ClearTheCode guidance (Buick · Electrical & electronics)

Summary: For 2018 Enclave Battery Draining Fast - "Service Charging System" 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 2018 Buick Enclave Premium has been having battery issues lately. Over the past few weeks, the battery seems to drain overnight, and I've had to jump-start it a few times. The "Service Charging System" light also came on last week.

I had the battery tested at AutoZone, and they said it was good, but the charging system might be the problem. I'm worried about getting stranded. Has anyone else e…

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

Menu

Help & account