MyTeslaMate
STITCH4 family

STITCH4_a027_FW_HV_BUS_TOP_UV

Not Available

What does the STITCH4_a027_FW_HV_BUS_TOP_UV alert mean?

A fast firmware trip has been detected due to High Voltage (HV) readings being below the expected bus top half voltage threshold.

What you'll see in your Tesla

  • Not Available

What triggers it

Single HV top half bus voltage drops below the expected threshold.

When it clears

Single HV top half bus voltage exceeds the expected threshold.

Potential impact

STITCH will halt operation, low voltage will not be supported.

Affected models

Semitruck

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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.