MyTeslaMate App

Signal Name	Description	Condition	Impact
VCFRONT_a471_emergencyFrunkButtonPressIgnored	Frunk interior emergency release button press has been detected, but the frunk was not opened because vehicle was in motion.	Frunk emergency interior release button press detected while the vehicle is in motion.	Possible occupant or object inside the frunk pressing the interior release button.
VCFRONT_a466_highFlowIndexLowSubcoolFlagged	The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is low.	The estimated refrigerant flow index is above the expected level, and the subcool is low.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a465_lowFlowIndexHighSubcoolFlagged	The flow index value is low at high subcool. The refrigerant flow rate through the electronic expansion valves (EXV) is not meeting the expected value when compared to the compressor refrigerant flow rate.	The vehicle detects that refrigerant flow index is below expected levels and subcool is high.	The thermal system may not perform as expected.
VCFRONT_a467_lowPowerIndexFlagged	The vehicle controller detects the actual A/C compressor power is lower than expected.	The A/C compressor power index is lower than expected.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a470_implausiblePdPlDetected	Difference between the discharge pressure and liquid pressure (Pd-Pl) increased. Discharge lines or Liquid Cooled Condenser (LCC) or Shut Off Valve (SOV) may be blocked.	Pd-Pl is greater than 6 bar for 5 consecutive seconds.	Thermal performance is degraded.
VCFRONT_a447_cabinHVACUnavailable	The vehicle controller detects a condition(s) affecting the Thermal Management System that prevents it from performing as designed.	The vehicle controller detects a condition(s) affecting the Thermal Management System. Alert log signal data for the cabinHVACUnavailableContext alert should provide more information on the specific condition(s) detected.	Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a480_vnf1048Fault	There is an unexpected condition affecting a VNF1048 chip.	The VNF1048 chip reports a condition affecting its operation.	Affected eFuse may not be on.
VCFRONT_a500_eFuseASICStateMismatch	The eFuse application-specific integrated circuit (ASIC) on the vehicle controller is in an unexpected state	Vehicle controller eFuse ASIC is not in the requested state	Vehicle Controller eFuse ASIC may not turn on or off as expected
VCFRONT_a462_LVBMSFault	The low voltage battery management system (LVBMS) reports a condition affecting the low voltage (LV) battery or the ability of the LVBMS to manage the LV battery. May result in LV battery damage or loss of LV battery support for vehicle electrical systems.	The LVBMS detects a condition affecting its ability to manage the LV battery. Alert log signal data should provide more information.	Lack of LVBMS functionality may result in LV battery damage or degradation, and may also result in loss of LV battery support for vehicle electrical systems.
VCFRONT_a476_LVBMSMIA	One or more of the messages the vehicle controller receives periodically from the Low Voltage Battery Management System (LVBMS) is not received, indicating the LVBMS may be unavailable (MIA).	The vehicle controller does not receive one or more of the expected messages from LVBMS within the expected time frame over the local interconnect network (LIN).	Vehicle functions that depend on the low voltage battery controllers may be unavailable or may not function as expected.
VCFRONT_a464_highFlowIndexHighSubcoolFlagged	The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is high.	The estimated refrigerant flow index is above the expected level, and the subcool is high.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a460_hardIsentropicTdFailed	The vehicle controller detects the isentropic check for the refrigerant discharge temperature (TD) is unsuccessful, indicating the A/C compressor mass flow rate is below the expected level.	The isentropic check for the TD is unsuccessful.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a444_drv8703Fault	The bridge gate driver experienced a condition affecting its operation.	The bridge gate driver reports a condition affecting its operation.	Actuators controlled by the bridge gate driver may be inoperative.
VCFRONT_a446_cabinHVACUnavailableContext	Condition(s) affecting the thermal management system have reduced cabin heating and/or cooling performance or made cabin heating and/or cooling unavailable.	May set due to many possible conditions affecting thermal management system functionality. Alert log signal data should provide information on specific condition(s).	Cabin heating and/or cooling performance may be limited, or cabin heating and/or cooling may be unavailable.
VCFRONT_a436_TLVBMS_DischargeOverCurrent	LV System Discharge Over Current	BMS_packCurrent is less than -BMS_maxDischargeCurrent by too much for too long	BMS will exit the HV_UP state
VCFRONT_a439_TLVBMS_PackOverTemperatureWarning	A Low Voltage (LV) battery pack module temperature is above the warning temperature limit.	A battery pack module temperature is above the warning temperature limit for longer than expected.	Vehicle may be unable to drive.
VCFRONT_a449_hornSwitchStuckOn	The steering wheel horn switch is stuck on	The steering wheel horn switch has been pressed for 60 seconds	The steering wheel horn switch no longer activates the horn
VCFRONT_a451_refrigerantNotCommissioned	The refrigerant system has not been commissioned or has been decommissioned by the Thermal Fill Drain service routine.	The Thermal Fill Drain service routine is run.	Powertrain and HVAC performance will be limited, the compressor will be limited to 2000rpm.
VCFRONT_a404_resistanceEstimationHardFailure	The low voltage (LV) battery internal resistance is too high, based on measured voltage being below the acceptable threshold during a resistance estimation test. Indicates LV battery replacement is necessary.	The LV battery voltage dropped below the lower limit during a resistance estimation test.	The LV battery may be unable to support precharge loads / precharge the high voltage (HV) bus, and requires replacement.
VCFRONT_a407_dcrMilliOhmsAboveThreshold	The low voltage (LV) battery internal resistance is too high, based on a direct current internal resistance (DCR) calculation. Indicates LV battery replacement is necessary.	Direct current internal resistance (DCR) calculation indicates the LV battery internal resistance exceeds expected threshold (normal operating range).	The LV battery may be unable to support precharge loads / precharge the high voltage (HV) bus, and requires replacement.

VCFRONT_a471_emergencyFrunkButtonPressIgnored

Frunk interior emergency release button press has been detected, but the frunk was not opened because vehicle was in motion.

Frunk emergency interior release button press detected while the vehicle is in motion.

Possible occupant or object inside the frunk pressing the interior release button.

VCFRONT_a466_highFlowIndexLowSubcoolFlagged

The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is low.

The estimated refrigerant flow index is above the expected level, and the subcool is low.

Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.

VCFRONT_a465_lowFlowIndexHighSubcoolFlagged

The flow index value is low at high subcool. The refrigerant flow rate through the electronic expansion valves (EXV) is not meeting the expected value when compared to the compressor refrigerant flow rate.

The vehicle detects that refrigerant flow index is below expected levels and subcool is high.

The thermal system may not perform as expected.

VCFRONT_a467_lowPowerIndexFlagged

The vehicle controller detects the actual A/C compressor power is lower than expected.

The A/C compressor power index is lower than expected.

Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.

VCFRONT_a470_implausiblePdPlDetected

Difference between the discharge pressure and liquid pressure (Pd-Pl) increased. Discharge lines or Liquid Cooled Condenser (LCC) or Shut Off Valve (SOV) may be blocked.

Pd-Pl is greater than 6 bar for 5 consecutive seconds.

Thermal performance is degraded.

VCFRONT_a447_cabinHVACUnavailable

The vehicle controller detects a condition(s) affecting the Thermal Management System that prevents it from performing as designed.

The vehicle controller detects a condition(s) affecting the Thermal Management System. Alert log signal data for the cabinHVACUnavailableContext alert should provide more information on the specific condition(s) detected.

Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.

VCFRONT_a480_vnf1048Fault

There is an unexpected condition affecting a VNF1048 chip.

The VNF1048 chip reports a condition affecting its operation.

Affected eFuse may not be on.

VCFRONT_a500_eFuseASICStateMismatch

The eFuse application-specific integrated circuit (ASIC) on the vehicle controller is in an unexpected state

Vehicle controller eFuse ASIC is not in the requested state

Vehicle Controller eFuse ASIC may not turn on or off as expected

VCFRONT_a462_LVBMSFault

The low voltage battery management system (LVBMS) reports a condition affecting the low voltage (LV) battery or the ability of the LVBMS to manage the LV battery. May result in LV battery damage or loss of LV battery support for vehicle electrical systems.

The LVBMS detects a condition affecting its ability to manage the LV battery. Alert log signal data should provide more information.

Lack of LVBMS functionality may result in LV battery damage or degradation, and may also result in loss of LV battery support for vehicle electrical systems.

VCFRONT_a476_LVBMSMIA

One or more of the messages the vehicle controller receives periodically from the Low Voltage Battery Management System (LVBMS) is not received, indicating the LVBMS may be unavailable (MIA).

The vehicle controller does not receive one or more of the expected messages from LVBMS within the expected time frame over the local interconnect network (LIN).

Vehicle functions that depend on the low voltage battery controllers may be unavailable or may not function as expected.

VCFRONT_a464_highFlowIndexHighSubcoolFlagged

The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is high.

The estimated refrigerant flow index is above the expected level, and the subcool is high.

Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.

VCFRONT_a460_hardIsentropicTdFailed

The vehicle controller detects the isentropic check for the refrigerant discharge temperature (TD) is unsuccessful, indicating the A/C compressor mass flow rate is below the expected level.

The isentropic check for the TD is unsuccessful.

Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.

VCFRONT_a444_drv8703Fault

The bridge gate driver experienced a condition affecting its operation.

The bridge gate driver reports a condition affecting its operation.

Actuators controlled by the bridge gate driver may be inoperative.

VCFRONT_a446_cabinHVACUnavailableContext

Condition(s) affecting the thermal management system have reduced cabin heating and/or cooling performance or made cabin heating and/or cooling unavailable.

May set due to many possible conditions affecting thermal management system functionality. Alert log signal data should provide information on specific condition(s).

Cabin heating and/or cooling performance may be limited, or cabin heating and/or cooling may be unavailable.

VCFRONT_a436_TLVBMS_DischargeOverCurrent

LV System Discharge Over Current

BMS_packCurrent is less than -BMS_maxDischargeCurrent by too much for too long

BMS will exit the HV_UP state

VCFRONT_a439_TLVBMS_PackOverTemperatureWarning

A Low Voltage (LV) battery pack module temperature is above the warning temperature limit.

A battery pack module temperature is above the warning temperature limit for longer than expected.

Vehicle may be unable to drive.

VCFRONT_a449_hornSwitchStuckOn

The steering wheel horn switch is stuck on

The steering wheel horn switch has been pressed for 60 seconds

The steering wheel horn switch no longer activates the horn

VCFRONT_a451_refrigerantNotCommissioned

The refrigerant system has not been commissioned or has been decommissioned by the Thermal Fill Drain service routine.

The Thermal Fill Drain service routine is run.

Powertrain and HVAC performance will be limited, the compressor will be limited to 2000rpm.

VCFRONT_a404_resistanceEstimationHardFailure

The low voltage (LV) battery internal resistance is too high, based on measured voltage being below the acceptable threshold during a resistance estimation test. Indicates LV battery replacement is necessary.

The LV battery voltage dropped below the lower limit during a resistance estimation test.

The LV battery may be unable to support precharge loads / precharge the high voltage (HV) bus, and requires replacement.

VCFRONT_a407_dcrMilliOhmsAboveThreshold

The low voltage (LV) battery internal resistance is too high, based on a direct current internal resistance (DCR) calculation. Indicates LV battery replacement is necessary.

Direct current internal resistance (DCR) calculation indicates the LV battery internal resistance exceeds expected threshold (normal operating range).

The LV battery may be unable to support precharge loads / precharge the high voltage (HV) bus, and requires replacement.

Alerts

Alerts