MyTeslaMate App

Signal Name	Description	Condition	Impact
BMS_w036_SW_HVIL	The battery management system (BMS) detects an issue with the high voltage interlock loop (HVIL). The voltage at the HVIL output pin of the BMS is too low (in respect to the number of HVIL nodes the vehicle has) or too close to the HVIL open voltage.	HVIL output voltage sensed by the BMS is outside of the expected bounds.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w035_SW_Isolation	There is an external or internal isolation alert while pack contactors are closed.	The BMS detects that isolation is below the minimum threshold while contactors are closed.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w034_SW_Isolation_Sensor	The battery management system (BMS) detects that there is an isolation sensor error.	The BMS runs into an abnormality during the isolation circuit test.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w033_SW_Crash	The battery management system (BMS) detects that there was loss of power to pack contactors while they are closed. The BMS assumes that the pyro fuse on the contactor power supply signal blew during a crash.	The BMS detects that there is a loss of power to pack contactors while they are closed.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w032_SW_BusVNotReducing	The battery management system (BMS) detects that bus voltage is not reducing quickly enough.	The BMS detects that the DC link voltage has not discharged to below 60V within 5 seconds of opening the contactors.	Power is reduced.
BMS_w031_SW_Precharge_Res_Hot	The battery management system (BMS) has detected that the HV battery precharge resistor is above the maximum operating temperature.	The BMS detects that pack contactors have opened and closed too many times in a short period of time.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w030_SW_Chg_Port_Door_Open	The battery management system (BMS) has detected that the charge port door is open and the fast charge (FC) contactors are welded.	The BMS detects that the charge port door is open and the FC contactors are welded.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w029_SW_Current_Sensor_Reset	The battery management system (BMS) senses that the current sensor is undergoing a hard reset.	The battery management system (BMS) detects that a hard reset begins.	This alert is primarily informational and used for logging purposes.
BMS_w028_SW_Drive_Iso_StdDev	The battery management system (BMS) detects that the standard deviation of isolation resistance while in drive is high.	The BMS detects that the standard deviation of the high voltage (HV) isolation is outside of the set threshold.	This alert is primarily informational and indicates a potential isolation issue.
BMS_w027_SW_Drive_Iso_Repeated	The battery management system (BMS) detects that there was a repeated loss of isolation during drive.	The BMS detects that isolation dropped multiple times below the minimum threshold while driving.	The vehicle will not start.
BMS_w026_SW_Ctrs_Disabled	The battery management system (BMS) detects that pack contactors have been disabled.	The BMS detects a condition that requires the contactors to stay open until they are serviced.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w025_SW_FC_Ctrs_Open_Undr_Ld	The battery management system (BMS) has detected that the fast charge contactors opened under load.	The battery management system (BMS) has detected that the fast charge contactors opened under load.	This alert is primarily informational and is used for logging purposes.
BMS_w051_SW_Current_Sensor_MIA	The battery management system (BMS) cannot communicate with the high voltage (HV) battery internal current sensor and has reported it as missing (MIA).	The BMS is not receiving one or more communication messages from the internal current sensor/shunt when expected.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w023_SW_Contactors_Open_HWOC	This alert is used as a counter to record the number of hardware overcurrents (HWOC) detected by the battery management system (BMS).	The BMS detects that the contactors were opened under load because of a HWOC event.	This alert is primarily informational and is used for logging purposes.
BMS_w022_SW_Over_Current	The battery management system (BMS) has detected a software overcurrent event.	The high voltage (HV) battery pack current (discharge or charge) exceeded the maximum limit.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w021_SW_Dr_Limits_Regulation	The battery management system (BMS) limits power because the pack current, pack voltage, or brick voltage, is outside of the expected bounds.	The BMS detects that regen current, discharge current, pack voltage, or brick voltage is too high or too low. Alert log signal data provides information on the specific condition(s) detected.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w052_SW_Charger_MIA	The battery management system (BMS) cannot communicate with the master charger and has reported it as missing (MIA).	The BMS is not receiving one or more CAN communication messages from the master charger when expected.	Inability to charge.
BMS_w054_SW_Current_Sensor	The battery management system (BMS) detects an issue with the high voltage (HV) internal current sensor.	The measured current is sufficiently far from zero with contactors open, the current sensor is reporting the same current for too many samples in a row, or the current sensor is behaving irrationally (for example, it is dropping packets).	Inability to charge, drive, or support the low voltage (LV) system
BMS_w056_SW_Module_Temp_Outlier	The battery management system (BMS) detects one or more thermistors report that a specific module has an outlier temperature when compared to the other modules. This alert is for logging purposes only.	One or more thermistors report that a specific module has an outlier temperature when compared to the other modules.	This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.
BMS_w059_SW_Pack_Voltage_Sensing	The battery management system (BMS) detects that the pack voltage does not match the sum of the brick voltages.	The BMS detects that the HV pack voltage differs from the sum of the brick voltages by more than 3%.	Inability to charge, drive, or support the low voltage (LV) system

BMS_w036_SW_HVIL

The battery management system (BMS) detects an issue with the high voltage interlock loop (HVIL). The voltage at the HVIL output pin of the BMS is too low (in respect to the number of HVIL nodes the vehicle has) or too close to the HVIL open voltage.

HVIL output voltage sensed by the BMS is outside of the expected bounds.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w035_SW_Isolation

There is an external or internal isolation alert while pack contactors are closed.

The BMS detects that isolation is below the minimum threshold while contactors are closed.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w034_SW_Isolation_Sensor

The battery management system (BMS) detects that there is an isolation sensor error.

The BMS runs into an abnormality during the isolation circuit test.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w033_SW_Crash

The battery management system (BMS) detects that there was loss of power to pack contactors while they are closed. The BMS assumes that the pyro fuse on the contactor power supply signal blew during a crash.

The BMS detects that there is a loss of power to pack contactors while they are closed.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w032_SW_BusVNotReducing

The battery management system (BMS) detects that bus voltage is not reducing quickly enough.

The BMS detects that the DC link voltage has not discharged to below 60V within 5 seconds of opening the contactors.

Power is reduced.

BMS_w031_SW_Precharge_Res_Hot

The battery management system (BMS) has detected that the HV battery precharge resistor is above the maximum operating temperature.

The BMS detects that pack contactors have opened and closed too many times in a short period of time.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w030_SW_Chg_Port_Door_Open

The battery management system (BMS) has detected that the charge port door is open and the fast charge (FC) contactors are welded.

The BMS detects that the charge port door is open and the FC contactors are welded.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w029_SW_Current_Sensor_Reset

The battery management system (BMS) senses that the current sensor is undergoing a hard reset.

The battery management system (BMS) detects that a hard reset begins.

This alert is primarily informational and used for logging purposes.

BMS_w028_SW_Drive_Iso_StdDev

The battery management system (BMS) detects that the standard deviation of isolation resistance while in drive is high.

The BMS detects that the standard deviation of the high voltage (HV) isolation is outside of the set threshold.

This alert is primarily informational and indicates a potential isolation issue.

BMS_w027_SW_Drive_Iso_Repeated

The battery management system (BMS) detects that there was a repeated loss of isolation during drive.

The BMS detects that isolation dropped multiple times below the minimum threshold while driving.

The vehicle will not start.

BMS_w026_SW_Ctrs_Disabled

The battery management system (BMS) detects that pack contactors have been disabled.

The BMS detects a condition that requires the contactors to stay open until they are serviced.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w025_SW_FC_Ctrs_Open_Undr_Ld

The battery management system (BMS) has detected that the fast charge contactors opened under load.

This alert is primarily informational and is used for logging purposes.

BMS_w051_SW_Current_Sensor_MIA

The battery management system (BMS) cannot communicate with the high voltage (HV) battery internal current sensor and has reported it as missing (MIA).

The BMS is not receiving one or more communication messages from the internal current sensor/shunt when expected.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w023_SW_Contactors_Open_HWOC

This alert is used as a counter to record the number of hardware overcurrents (HWOC) detected by the battery management system (BMS).

The BMS detects that the contactors were opened under load because of a HWOC event.

This alert is primarily informational and is used for logging purposes.

BMS_w022_SW_Over_Current

The battery management system (BMS) has detected a software overcurrent event.

The high voltage (HV) battery pack current (discharge or charge) exceeded the maximum limit.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w021_SW_Dr_Limits_Regulation

The battery management system (BMS) limits power because the pack current, pack voltage, or brick voltage, is outside of the expected bounds.

The BMS detects that regen current, discharge current, pack voltage, or brick voltage is too high or too low. Alert log signal data provides information on the specific condition(s) detected.

Inability to charge, drive, or support the low voltage (LV) system

BMS_w052_SW_Charger_MIA

The battery management system (BMS) cannot communicate with the master charger and has reported it as missing (MIA).

The BMS is not receiving one or more CAN communication messages from the master charger when expected.

Inability to charge.

BMS_w054_SW_Current_Sensor

The battery management system (BMS) detects an issue with the high voltage (HV) internal current sensor.

The measured current is sufficiently far from zero with contactors open, the current sensor is reporting the same current for too many samples in a row, or the current sensor is behaving irrationally (for example, it is dropping packets).

Inability to charge, drive, or support the low voltage (LV) system

BMS_w056_SW_Module_Temp_Outlier

The battery management system (BMS) detects one or more thermistors report that a specific module has an outlier temperature when compared to the other modules. This alert is for logging purposes only.

One or more thermistors report that a specific module has an outlier temperature when compared to the other modules.

This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.

BMS_w059_SW_Pack_Voltage_Sensing

The battery management system (BMS) detects that the pack voltage does not match the sum of the brick voltages.

The BMS detects that the HV pack voltage differs from the sum of the brick voltages by more than 3%.

Inability to charge, drive, or support the low voltage (LV) system

Alerts

Alerts