MyTeslaMate App

Signal Name	Description	Condition	Impact
BMS_w105_SW_One_Module_Tsense	The battery management system (BMS) detects that a thermistor on a module is shorted or railed.	A battery monitoring board (BMB) detects that any of the thermistors on a module is reporting an out-of-bounds temperature.	The vehicle operates normally with only one thermistor on the module.
BMS_w104_HW_BMB_Enumeration	The battery management system (BMS) detects that one or several battery monitoring boards (BMB) are unable to enumerate when the vehicle starts.	The battery management system (BMS) detects that one or several battery monitoring boards (BMB) are unable to enumerate when the vehicle starts.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w103_HW_BMB_Memory_Parity	The battery management system (BMS) detects an internal issue with the flash memory on a battery monitoring board (BMB).	The BMS detects an issue with the random-access memory (RAM) on a BMB.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w102_HW_BMB_Thermal_Shutdown	The battery management system (BMS) detects that the temperature of a module is too high.	A battery monitoring board (BMB) reports a module temperature above the set threshold.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w101_HW_BMB_Over_Temperature	A battery monitoring board (BMB) reports to the battery management system (BMS) that it is overheating.	A BMB reports a temperature above the maximum threshold.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w100_HW_BMB_Reset	A battery monitoring board (BMB) reports a power-on reset event, indicating that the BMB may have previously been unavailable for communication with the battery management system (BMS).	Any BMB experiences a power loss or internal error that causes a power-on reset event.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w098_HW_BMB_Over_Voltage	A battery monitoring board (BMB) reports a brick over voltage event, indicating that the BMB has detected a brick voltage higher than the maximum allowed brick voltage threshold.	A brick voltage exceeds the maximum allowed brick voltage threshold.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w097_HW_BMB_Under_Voltage	A battery monitoring board (BMB) reports a brick under voltage event, indicating that the BMB has detected a brick voltage lower than the minimum allowed brick voltage threshold.	A brick voltage drops below the minimum allowed brick voltage threshold.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w096_SW_Fast_Charger_MIA	The Battery Management System (BMS) does not receive messages from the external fast charge equipment.	The BMS does not receive one or more required signals from the external fast charge equipment.	The vehicle is unable to fast charge, but AC charging still operates as designed.
BMS_w094_SW_Drive_Inverter_MIA	The battery management system (BMS) does not receive one or more expected controller area network (CAN) messages from the drive inverter (DI) and has reported it as missing (MIA).	The BMS has not received one or more expected CAN messages from the DI.	Power is reduced.
BMS_w093_SW_FastChg_Problem	The vehicle has detected a condition preventing fast charging.	A condition that prevents fast charging is present on the vehicle.	The vehicle is unable to fast charge, but AC charging still operates as designed.
BMS_w089_SW_THC_MIA	The battery management system (BMS) reported that the thermal controller (THC) was missing (MIA) on controller area network (CAN).	The BMS has not received the full set of expected messages from the THC for ten times the message period.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w086_SW_Not_Ok_To_Precharge	The battery management system (BMS) has detected an issue that prevents precharging and prevents the pack contactors from closing.	The BMS has detected an issue that prevents precharging. Alert log signal data provides information on the specific condition(s) detected.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w080_SW_Int_HV_Disconnect	The battery management system (BMS) has detected that the high voltage (HV) battery pack voltage differs from the sum of the brick voltages, making the HV battery unavailable for charging, driving, or supporting the low voltage (LV) battery.	The high voltage (HV) battery pack voltage differs from sum of all the brick voltages.	The vehicle is unable to charge or drive. The high voltage (HV) battery cannot support the low voltage (LV) battery.
BMS_w145_SW_socChange	The vehicle's State of Charge (SOC) changed when the pack is resting from open-circuit voltage (OCV) calibration.	The SOC change is greater than specific threshold.	This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.
BMS_w142_SW_Isolation_Degradatio	The battery management system (BMS) detects that the high voltage (HV) isolation contactor closed below the warning threshold.	The BMS detects that the HV isolation was below the warning threshold when pack contactors closed.	This alert indicates that HV isolation is low, but above the sufficient level for vehicle operation.
BMS_w044_SW_Assertion	This is an engineering diagnostic alert. It indicates that the software noticed something unexpected but still ended up in an expected state condition. If this alert persists, it may indicate an issue in the production code.	An assertion in the software is false.	This alert is primarily informational and is used for logging purposes.
BMS_w039_SW_DC_Link_Over_Voltage	The battery management system (BMS) has detected that there is an over voltage event external to the high voltage (HV) battery.	The BMS detects that the bus voltage is higher than maximum voltage threshold.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w038_SW_Neg_Contactor	The battery management system (BMS) detects that the negative contactor remains open during the first 2 seconds of pack contactors attempting to close.	The BMS detects that the negative pack contactor is welded.	Inability to charge, drive, or support the low voltage (LV) system
BMS_w037_SW_Pos_Contactor	The battery management system (BMS) detects that the positive contactor remains open during the first 2 seconds of pack contactors attempting to close.	The BMS detects that the positive pack contactor is welded or broken.	Inability to charge, drive, or support the low voltage (LV) system

BMS_w105_SW_One_Module_Tsense

The battery management system (BMS) detects that a thermistor on a module is shorted or railed.

A battery monitoring board (BMB) detects that any of the thermistors on a module is reporting an out-of-bounds temperature.

The vehicle operates normally with only one thermistor on the module.

BMS_w104_HW_BMB_Enumeration

The battery management system (BMS) detects that one or several battery monitoring boards (BMB) are unable to enumerate when the vehicle starts.

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

BMS_w103_HW_BMB_Memory_Parity

The battery management system (BMS) detects an internal issue with the flash memory on a battery monitoring board (BMB).

The BMS detects an issue with the random-access memory (RAM) on a BMB.

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

BMS_w102_HW_BMB_Thermal_Shutdown

The battery management system (BMS) detects that the temperature of a module is too high.

A battery monitoring board (BMB) reports a module temperature above the set threshold.

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

BMS_w101_HW_BMB_Over_Temperature

A battery monitoring board (BMB) reports to the battery management system (BMS) that it is overheating.

A BMB reports a temperature above the maximum threshold.

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

BMS_w100_HW_BMB_Reset

A battery monitoring board (BMB) reports a power-on reset event, indicating that the BMB may have previously been unavailable for communication with the battery management system (BMS).

Any BMB experiences a power loss or internal error that causes a power-on reset event.

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

BMS_w098_HW_BMB_Over_Voltage

A battery monitoring board (BMB) reports a brick over voltage event, indicating that the BMB has detected a brick voltage higher than the maximum allowed brick voltage threshold.

A brick voltage exceeds the maximum allowed brick voltage threshold.

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

BMS_w097_HW_BMB_Under_Voltage

A battery monitoring board (BMB) reports a brick under voltage event, indicating that the BMB has detected a brick voltage lower than the minimum allowed brick voltage threshold.

A brick voltage drops below the minimum allowed brick voltage threshold.

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

BMS_w096_SW_Fast_Charger_MIA

The Battery Management System (BMS) does not receive messages from the external fast charge equipment.

The BMS does not receive one or more required signals from the external fast charge equipment.

The vehicle is unable to fast charge, but AC charging still operates as designed.

BMS_w094_SW_Drive_Inverter_MIA

The battery management system (BMS) does not receive one or more expected controller area network (CAN) messages from the drive inverter (DI) and has reported it as missing (MIA).

The BMS has not received one or more expected CAN messages from the DI.

Power is reduced.

BMS_w093_SW_FastChg_Problem

The vehicle has detected a condition preventing fast charging.

A condition that prevents fast charging is present on the vehicle.

The vehicle is unable to fast charge, but AC charging still operates as designed.

BMS_w089_SW_THC_MIA

The battery management system (BMS) reported that the thermal controller (THC) was missing (MIA) on controller area network (CAN).

The BMS has not received the full set of expected messages from the THC for ten times the message period.

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

BMS_w086_SW_Not_Ok_To_Precharge

The battery management system (BMS) has detected an issue that prevents precharging and prevents the pack contactors from closing.

The BMS has detected an issue that prevents precharging. Alert log signal data provides information on the specific condition(s) detected.

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

BMS_w080_SW_Int_HV_Disconnect

The battery management system (BMS) has detected that the high voltage (HV) battery pack voltage differs from the sum of the brick voltages, making the HV battery unavailable for charging, driving, or supporting the low voltage (LV) battery.

The high voltage (HV) battery pack voltage differs from sum of all the brick voltages.

The vehicle is unable to charge or drive. The high voltage (HV) battery cannot support the low voltage (LV) battery.

BMS_w145_SW_socChange

The vehicle's State of Charge (SOC) changed when the pack is resting from open-circuit voltage (OCV) calibration.

The SOC change is greater than specific threshold.

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

BMS_w142_SW_Isolation_Degradatio

The battery management system (BMS) detects that the high voltage (HV) isolation contactor closed below the warning threshold.

The BMS detects that the HV isolation was below the warning threshold when pack contactors closed.

This alert indicates that HV isolation is low, but above the sufficient level for vehicle operation.

BMS_w044_SW_Assertion

This is an engineering diagnostic alert. It indicates that the software noticed something unexpected but still ended up in an expected state condition. If this alert persists, it may indicate an issue in the production code.

An assertion in the software is false.

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

BMS_w039_SW_DC_Link_Over_Voltage

The battery management system (BMS) has detected that there is an over voltage event external to the high voltage (HV) battery.

The BMS detects that the bus voltage is higher than maximum voltage threshold.

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

BMS_w038_SW_Neg_Contactor

The battery management system (BMS) detects that the negative contactor remains open during the first 2 seconds of pack contactors attempting to close.

The BMS detects that the negative pack contactor is welded.

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

BMS_w037_SW_Pos_Contactor

The battery management system (BMS) detects that the positive contactor remains open during the first 2 seconds of pack contactors attempting to close.

The BMS detects that the positive pack contactor is welded or broken.

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

Alerts

Alerts