MyTeslaMate
BMS family

BMS_w156_SW_BMB_Vref_bad

Service is required

What does the BMS_w156_SW_BMB_Vref_bad alert mean?

The battery management system (BMS) has detected a battery monitoring board (BMB) voltage reference is unstable.

What you'll see in your Tesla

  • Service is required
  • Schedule service

What triggers it

The BMS detects a BMB voltage reference is unstable.

When it clears

The BMS detects that the condition clears.

Potential impact

This alert is primarily informational.

Affected models

Model S 2012-2020 Model X 2015-2020

Track your Tesla's alerts automatically

Alerts like this reach MyTeslaMate through your car's Tesla telemetry API. MyTeslaMate logs every alert your Tesla reports and turns it into readable history and real-time notifications — hosted TeslaMate with no server to run.