MyTeslaMate App

Signal Name	Description	Condition	Impact
HVBATT_a026_LsShuntPassiveReference	Low-side passive pyro reference is out-of-tolerance.	Low-side passive pyro reference is out-of-tolerance	Low-side passive pyro fuse thresholds are affected
HVBATT_a025_LsShuntOverTemperature	Low-side shunt bar temperature is too high.	Low-side shunt bar temperature is too high	Low-side pack HV will be blocked. The shunt may become physically damaged.
HVBATT_a024_LsShuntThermistorMia	The low side shunt thermistor is not reporting as expected. Vehicle may be unable to drive or DC charge.	Low side shunt thermistor reading is open circuit.	Vehicle may be unable to drive. DC charging may be limited or unavailable.
HVBATT_a022_LsShuntAsicMia	The Battery Management System (BMS) has detected an error with the low-side shunt measurement circuit.	Communications with the shunt measurement circuit are lost.	Drive power is reduced to avoid unintended pyro fuse deployment.
HVBATT_a021_FcCtrOpenBlockedPyroDeployed	FC contactors were blocked from opening due to high current. Pyro deployed instead.	Charge current is above threshold while trying to open FC contactors.	The positive and negative pyro fuses will be deployed.
HVBATT_a020_PackCtrOpenBlockedPyroDeployed	Pack contactors were blocked from opening due to high current. Pyro deployed instead.	Pack current is above threshold while trying to open pack contactors.	The positive and negative pyro fuses will be deployed.
HVBATT_a019_HsShuntTcrCalNotUsed	The low side shunt thermal coefficient of resistance (TCR) calibrations are not being used for high voltage (HV) current sensing. The default low side shunt TCR coefficients will be used and current measurement accuracy may be reduced.	The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.	The default low side shunt TCR coefficients will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.
HVBATT_a018_HsShuntBarCalNotUsed	The programmed high side shunt bar resistance calibration is not being used for high voltage (HV) current sensing. The default high side shunt bar resistance will be used and current measurement accuracy may be reduced.	The stored high side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.	The default high side shunt bar resistance will be used for high voltage (HV) current sensing. High side shunt current measurement accuracy may be reduced.
HVBATT_a017_HsShuntAsicCalNotUsed	The programmed high side shunt application-specific integrated circuit (ASIC) calibration is not being used for high voltage (HV) current sensing. The default high side shunt ASIC gain will be used and current measurement accuracy may be reduced.	The stored high side shunt ASIC gain is invalid or the written gain is outside the allowed tolerance.	The default high side shunt ASIC gain will be used for high voltage (HV) current sensing. High side shunt current measurement accuracy may be reduced.
HVBATT_a016_LsShuntTcrCalNotUsed	The low side shunt thermal coefficient of resistance (TCR) calibrations are not being used for high voltage (HV) current sensing. The default low side shunt TCR coefficients will be used and current measurement accuracy may be reduced.	The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.	The default low side shunt TCR coefficients will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.
HVBATT_a015_LsShuntBarCalNotUsed	The programmed bar resistance calibration is not being used for high voltage (HV) current sensing. The default low side shunt bar resistance will be used and current measurement accuracy may be reduced.	The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.	The default low side shunt bar resistance will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.
HVBATT_a014_LsShuntAsicCalNotUsed	The programmed low side shunt application-specific integrated circuit (ASIC) calibration is not being used for high voltage (HV) current sensing. The default low side shunt ASIC gain will be used and current measurement accuracy may be reduced.	The stored low side shunt ASIC gain is invalid or the written gain is outside the allowed tolerance.	The default low side shunt ASIC gain will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.
HVBATT_a013_BmbCommunication	A communication interruption has been detected in the Battery Monitoring Board (BMB) chain.	A communication issue with the BMB daisy chain is detected	May indicate a loss of BMB sensor data
HVBATT_a012_BmbDataIntegrityLoss	Data integrity loss due to Battery Monitoring Board (BMB) chain double break.	A prolonged communication issue with the BMB daisy chain that is known to cause a loss of BMB sensor data is detected	BMB sensor data is likely being substituted to replace data missing due to the communication issue
HVBATT_a011_Isolation	High voltage isolation is too low for the pack to be online.	Isolation is measured to be below the alert threshold while pack contactors are closed	Pack may not come online
HVBATT_a010_InternalIsolation	Measurement of internal isolation (within the pack) is too low.	Internal isolation is measured to be below the alert threshold	Pack may not come online
HVBATT_a009_RcmEnsCrashEvent	A crash event has occurred resulting in the deployment of one or more High Voltage (HV) system pyro fuses.	The Restraint Control Module (RCM) reports a crash via 1kHz Emergency Notification Signal (ENS) tones.	All pack pyro fuses will be deployed. The vehicle may not drive or charge.
HVBATT_a008_RcmCanCrashEvent	A crash event has occurred resulting in the deployment of one or more High Voltage (HV) system pyro fuses.	The Restraint Control Module (RCM) reports a crash over CAN while Emergency Notification Signal (ENS) tones are absent.	All pack pyro fuses will be deployed. The vehicle may not drive or charge.
HVBATT_a007_RcmEnsMia	HVBATT is not observing IDLE or ACTIVE pulses from the ENS.	No IDLE or ACTIVE ENS pulses are observed for a prolonged period of time. ENS may be damaged or disconnected.	HVBATT will rely on RCM_collisionRear and RCM_collisionSeverity to determine whether a crash event has occurred.
HVBATT_a005_DcdcExtDisableLatched	HVBATT has latched disablement of the DCDC due to an external DCDC disable.	VC_vehiclePowerState == DRIVE AND the external DCDC enable is logic level low.	HVBATT will keep the DCDC disabled, which may prevent the DCDC from providing support to the LV System.

HVBATT_a026_LsShuntPassiveReference

Low-side passive pyro reference is out-of-tolerance.

Low-side passive pyro reference is out-of-tolerance

Low-side passive pyro fuse thresholds are affected

HVBATT_a025_LsShuntOverTemperature

Low-side shunt bar temperature is too high.

Low-side shunt bar temperature is too high

Low-side pack HV will be blocked. The shunt may become physically damaged.

HVBATT_a024_LsShuntThermistorMia

The low side shunt thermistor is not reporting as expected. Vehicle may be unable to drive or DC charge.

Low side shunt thermistor reading is open circuit.

Vehicle may be unable to drive. DC charging may be limited or unavailable.

HVBATT_a022_LsShuntAsicMia

The Battery Management System (BMS) has detected an error with the low-side shunt measurement circuit.

Communications with the shunt measurement circuit are lost.

Drive power is reduced to avoid unintended pyro fuse deployment.

HVBATT_a021_FcCtrOpenBlockedPyroDeployed

FC contactors were blocked from opening due to high current. Pyro deployed instead.

Charge current is above threshold while trying to open FC contactors.

The positive and negative pyro fuses will be deployed.

HVBATT_a020_PackCtrOpenBlockedPyroDeployed

Pack contactors were blocked from opening due to high current. Pyro deployed instead.

Pack current is above threshold while trying to open pack contactors.

The positive and negative pyro fuses will be deployed.

HVBATT_a019_HsShuntTcrCalNotUsed

The low side shunt thermal coefficient of resistance (TCR) calibrations are not being used for high voltage (HV) current sensing. The default low side shunt TCR coefficients will be used and current measurement accuracy may be reduced.

The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.

The default low side shunt TCR coefficients will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.

HVBATT_a018_HsShuntBarCalNotUsed

The programmed high side shunt bar resistance calibration is not being used for high voltage (HV) current sensing. The default high side shunt bar resistance will be used and current measurement accuracy may be reduced.

The stored high side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.

The default high side shunt bar resistance will be used for high voltage (HV) current sensing. High side shunt current measurement accuracy may be reduced.

HVBATT_a017_HsShuntAsicCalNotUsed

The programmed high side shunt application-specific integrated circuit (ASIC) calibration is not being used for high voltage (HV) current sensing. The default high side shunt ASIC gain will be used and current measurement accuracy may be reduced.

The stored high side shunt ASIC gain is invalid or the written gain is outside the allowed tolerance.

The default high side shunt ASIC gain will be used for high voltage (HV) current sensing. High side shunt current measurement accuracy may be reduced.

HVBATT_a016_LsShuntTcrCalNotUsed

The low side shunt thermal coefficient of resistance (TCR) calibrations are not being used for high voltage (HV) current sensing. The default low side shunt TCR coefficients will be used and current measurement accuracy may be reduced.

The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.

The default low side shunt TCR coefficients will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.

HVBATT_a015_LsShuntBarCalNotUsed

The programmed bar resistance calibration is not being used for high voltage (HV) current sensing. The default low side shunt bar resistance will be used and current measurement accuracy may be reduced.

The stored low side shunt bar resistance is invalid or the written gain is outside the allowed tolerance.

The default low side shunt bar resistance will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.

HVBATT_a014_LsShuntAsicCalNotUsed

The programmed low side shunt application-specific integrated circuit (ASIC) calibration is not being used for high voltage (HV) current sensing. The default low side shunt ASIC gain will be used and current measurement accuracy may be reduced.

The stored low side shunt ASIC gain is invalid or the written gain is outside the allowed tolerance.

The default low side shunt ASIC gain will be used for high voltage (HV) current sensing. Low side shunt current measurement accuracy may be reduced.

HVBATT_a013_BmbCommunication

A communication interruption has been detected in the Battery Monitoring Board (BMB) chain.

A communication issue with the BMB daisy chain is detected

May indicate a loss of BMB sensor data

HVBATT_a012_BmbDataIntegrityLoss

Data integrity loss due to Battery Monitoring Board (BMB) chain double break.

A prolonged communication issue with the BMB daisy chain that is known to cause a loss of BMB sensor data is detected

BMB sensor data is likely being substituted to replace data missing due to the communication issue

HVBATT_a011_Isolation

High voltage isolation is too low for the pack to be online.

Isolation is measured to be below the alert threshold while pack contactors are closed

Pack may not come online

HVBATT_a010_InternalIsolation

Measurement of internal isolation (within the pack) is too low.

Internal isolation is measured to be below the alert threshold

Pack may not come online

HVBATT_a009_RcmEnsCrashEvent

A crash event has occurred resulting in the deployment of one or more High Voltage (HV) system pyro fuses.

The Restraint Control Module (RCM) reports a crash via 1kHz Emergency Notification Signal (ENS) tones.

All pack pyro fuses will be deployed. The vehicle may not drive or charge.

HVBATT_a008_RcmCanCrashEvent

A crash event has occurred resulting in the deployment of one or more High Voltage (HV) system pyro fuses.

The Restraint Control Module (RCM) reports a crash over CAN while Emergency Notification Signal (ENS) tones are absent.

All pack pyro fuses will be deployed. The vehicle may not drive or charge.

HVBATT_a007_RcmEnsMia

HVBATT is not observing IDLE or ACTIVE pulses from the ENS.

No IDLE or ACTIVE ENS pulses are observed for a prolonged period of time. ENS may be damaged or disconnected.

HVBATT will rely on RCM_collisionRear and RCM_collisionSeverity to determine whether a crash event has occurred.

HVBATT_a005_DcdcExtDisableLatched

HVBATT has latched disablement of the DCDC due to an external DCDC disable.

VC_vehiclePowerState == DRIVE AND the external DCDC enable is logic level low.

HVBATT will keep the DCDC disabled, which may prevent the DCDC from providing support to the LV System.

Alerts

Alerts