MyTeslaMate App

Signal Name	Description	Condition	Impact
VCFRONT_a473_threeWayValveFault	The front vehicle controller (VCFRONT) detects the three-way valve has encountered a condition preventing it from performing as designed.	The three-way valve encounters a condition preventing it from performing as designed. Alert log signal data should provide more information on the specific condition(s) detected.	Vehicle functions that rely on the three-way valve may be limited or unavailable.
VCFRONT_a498_PCSEFuseOVTLoadShed	The front vehicle controller (VCFRONT) detects the power conversion system (PCS) eFuse has exceeded 133 degrees C. The PCS eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced to 175A or less. VCFRONT is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).	The PCS eFuse temperature is detected as greater than 133 degrees C for 500 milliseconds.	Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).
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_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_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_a463_frunkSensorService	The vehicle controller detects the front trunk (also known as the frunk) sensor requires service as a condition affecting functionality has been detected on one or more of the frunk latch switches.	May set due to any of the following: (1) one of the switches is pressed while the other is not pressed; (2) one or more of the frunk latch switches on the frunk sensor are shorted, disconnected, or in an indeterminate voltage range.	The frunk may not function as expected. For example, the user interface (UI) on the center display may show the frunk as open when it is actually closed.
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_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_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_a503_TLVBMS_BrickExtendedOvFault	A Low Voltage (LV) battery pack brick voltage is above the over voltage limit for an extended time period.	A battery pack brick voltage is greater than the over voltage limit for an extended time period.	Vehicle may be unable to drive.
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_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_a459_thermalFillAndDrive	The vehicle controller detects that the Thermal Fill Drain service routine is being run while the vehicle is in Drive.	The Thermal Fill Drain service routine is run.	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
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_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_a441_TLVBMS_ResetNeededForNvmPackSwap	A pack serial number (SN) change has been detected which requires an ECU reset to re-initialize data from non-volatile memory (NVM).	A valid pack SN has been read with does not match the pack SN associated with the NVM data used after ECU reset	The NVM data used during initialization may not match with the swapped pack. Pack vitals, such as State of Charge, may be inaccurate
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_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_a508_bridgeEFuseLoadShed	Electrical current flowing through the Bridge eFuse has equaled or exceeded 120A. The Bridge eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced. The front vehicle controller (VCFRONT) is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).	The Bridge eFuse current value equals or exceeds 120A for 100 milliseconds.	Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).

VCFRONT_a473_threeWayValveFault

The front vehicle controller (VCFRONT) detects the three-way valve has encountered a condition preventing it from performing as designed.

The three-way valve encounters a condition preventing it from performing as designed. Alert log signal data should provide more information on the specific condition(s) detected.

Vehicle functions that rely on the three-way valve may be limited or unavailable.

VCFRONT_a498_PCSEFuseOVTLoadShed

The front vehicle controller (VCFRONT) detects the power conversion system (PCS) eFuse has exceeded 133 degrees C. The PCS eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced to 175A or less. VCFRONT is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).

The PCS eFuse temperature is detected as greater than 133 degrees C for 500 milliseconds.

Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).

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_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_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_a463_frunkSensorService

The vehicle controller detects the front trunk (also known as the frunk) sensor requires service as a condition affecting functionality has been detected on one or more of the frunk latch switches.

May set due to any of the following: (1) one of the switches is pressed while the other is not pressed; (2) one or more of the frunk latch switches on the frunk sensor are shorted, disconnected, or in an indeterminate voltage range.

The frunk may not function as expected. For example, the user interface (UI) on the center display may show the frunk as open when it is actually closed.

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_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_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_a503_TLVBMS_BrickExtendedOvFault

A Low Voltage (LV) battery pack brick voltage is above the over voltage limit for an extended time period.

A battery pack brick voltage is greater than the over voltage limit for an extended time period.

Vehicle may be unable to drive.

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_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_a459_thermalFillAndDrive

The vehicle controller detects that the Thermal Fill Drain service routine is being run while the vehicle is in Drive.

The Thermal Fill Drain service routine is run.

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

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_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_a441_TLVBMS_ResetNeededForNvmPackSwap

A pack serial number (SN) change has been detected which requires an ECU reset to re-initialize data from non-volatile memory (NVM).

A valid pack SN has been read with does not match the pack SN associated with the NVM data used after ECU reset

The NVM data used during initialization may not match with the swapped pack. Pack vitals, such as State of Charge, may be inaccurate

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_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_a508_bridgeEFuseLoadShed

Electrical current flowing through the Bridge eFuse has equaled or exceeded 120A. The Bridge eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced. The front vehicle controller (VCFRONT) is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).

The Bridge eFuse current value equals or exceeds 120A for 100 milliseconds.

Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).

Alerts

Alerts