HVREX family
HVREX_a074_BrickUnderVoltageFault
High voltage battery requires service
What does the HVREX_a074_BrickUnderVoltageFault alert mean?
A battery pack brick voltage is below the under voltage fault limit
What you'll see in your Tesla
- High voltage battery requires service
- Vehicle may not restart
What triggers it
A battery pack brick voltage is below the under voltage fault limit for X duration (in seconds)
When it clears
All battery pack brick voltages are above the under voltage fault limit
Potential impact
Inability to enter drive or support the low voltage (LV) system
Affected models
Cybertruck
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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.