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2017 XC90 T6 - "12V Battery Critical Charge" and Start/Stop Not Working

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Kim L. · rep 0 · May 22, 5:15 AM · 1 replies · solved · Question

My 2017 Volvo XC90 T6 Inscription has been showing the "12V Battery Critical Charge" message intermittently for a few weeks. Lately, the start/stop function has completely stopped working, which is annoying in city traffic.

I've noticed the car sometimes struggles a bit to crank, especially on colder mornings. I thought it might just be the auxiliary battery for the start/stop, but the main battery warning has me concerned.

Is this a common issue with these models? Should I be looking at replacing both batteries, or could it be something else like the alternator or a sensor? Any advice on what to check first would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:15 AM

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ClearTheCode guidance (Volvo · Electrical & electronics)

Summary: For 2017 XC90 T6 - "12V Battery Critical Charge" and Start/Stop 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: My 2017 Volvo XC90 T6 Inscription has been showing the "12V Battery Critical Charge" message intermittently for a few weeks. Lately, the start/stop function has completely stopped working, which is annoying in city traffic.

I've noticed the car sometimes struggles a bit to crank, especially on colder mornings. I thought it might just be the auxiliary battery for the start/stop, but the main batte…

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

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