BMS_a131_Bleed_FET_Failure
BMS_a131_Bleed_FET_Failure
Alert Information
Category
Battery
Severity
critical
Live Incidence Rate
<0.01%
Models
Model 3Model YModel SModel X
Description
A bleed Field-Effect Transistor (FET) on the Battery Management Board (BMB) is not operating as designed. This will prevent the battery from balancing the brick by decreasing the brick voltage.
Potential Impact
The bleed FET will prevent the battery from properly balancing the brick by bleeding the voltage down. There is a decrease in available energy to the vehicle potentially leading to decreased range.
Set Condition
Upon a periodic wake, after an ECU reset, or every 6 hours, the Battery Management System (BMS) will test all bleed switches by switching them on in turn. If the sensed brick voltage does not significantly change, this alert is set.
Clear Condition
The bleed test reports sufficient voltage change across each brick.