What is the 12V Auxiliary Battery Failure problem on a 2019 BMW i3 (I01)?

Common Problems with the
2019–2022 BMW i3 (I01)

We've identified 1 known issue that can affect the 2019–2022 BMW i3 (I01). None are considered critical, but they're worth knowing about before you buy.

Known Issues

Serious

Moderate

Minor

The 2019–2022 period has an average number of reported issues compared to other BMW i3 (I01) year periods.

All Known Issues

12V Auxiliary Battery Failure

MinorElectrics & Electronics

The small 12v battery powers the car's computers. When it fails, the car throws dozens of unrelated error codes and may refuse to engage the high-voltage system.

Most affected: All models

Estimated cost: £150–£250Affects: 2013–2022Often appears around: Age-related (4+ years)

Typical symptoms

•Random "High Voltage System" errors
•Car won't "Ready" or unlock
•Screen glitches

What to inspect before you buy

✓Check the date code on the 12v battery (should be replaced every 4-5 years)
✓If original, budget for immediate replacement

Buying Tips for the 2019 BMW i3 (I01)

✓On REx models, ensure the petrol engine starts and runs smoothly; many are never used and can seize or corrode internally
✓Check the custom narrow Bridgestone Ecopia tyres for wear; they are expensive and can wear quickly on the rear
✓Inspect the CFRP door sills and the plastic body panels for any cracks or structural damage
✓Verify the high-voltage battery capacity via the hidden service menu to ensure it hasn't degraded excessively

2018 BMW i3 (I01)