MyTeslaMate App

Signal Name	Description	Condition	Impact	Important
VCDOORFL_a002_PowerLossReset	Warns if the processor has experienced a reset due to power loss.	Sudden power loss.	Controller is MIA for some time.	No
VCBATT_a527_LVBatteryCellImbalance	The low voltage battery management system (LVBMS) reports it has detected a low voltage (LV) battery cell voltage imbalance.	The LVBMS detects that all LV battery cell voltages are not within 150mV of each other.	The LV battery may suddenly become unavailable and unable to support vehicle electrical systems. The LV battery may require replacement, and a separate alert should be present to indicate this condition if applicable.	No
VCBATT_a517_hibernationRecovery	The vehicle is attempting to recover from a deep sleep. If the vehicle does not begin charging, the vehicle will reenter deep sleep after 10 minutes.	The vehicle is in Transport Mode, the high voltage (HV) battery state of charge (SOC) is low, and the user attempts to interact with the vehicle.	Vehicle requires charging before it can be recovered from deep sleep. Until adequately charged, the vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.	No
VCBATT_a518_LVBMSFault_MOS_Open_packOV	The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a pack overvoltage condition.	The LVBMS detects a pack overvoltage condition affecting the LV battery.	The LV battery may be damaged and may be unable to support vehicle electrical systems.	No
VCBATT_a528_LVBatteryCommsDiscnctd	The low voltage (LV) battery is not communicating as expected, indicating a potential disconnection with the vehicle controller.	Electronic connector position assurance (ECPA) state is signal not available (SNA), or the intelligent battery sensor (IBS) is not functioning as expected and the low voltage battery management system (LVBMS) is not communicating (MIA).	Loss of low voltage (LV) battery communication with vehicle controller, so the vehicle electrical system may only be supported via the power conversion system (PCS).	No
VCBATT_a521_vcleftEFuseLoadShed	The electrical current flowing through the left vehicle controller (VCLEFT) eFuse is greater or equal to 100A. The VCLEFT eFuse circuit may open (trip) if the low voltage (LV) electrical system loads are not reduced. The vehicle controller requests the VCLEFT to shed vehicle electrical loads by cutting power to the less essential loads.	The VCLEFT eFuse current value equals or exceeds 100A for 100 milliseconds.	Some convenience features controlled by the VCLEFT will be unavailable as the vehicle controller limits the LV electrical system current draw by cutting power to some loads.	No
VCBATT_a514_LVBMSFault_MOS_Open_cellUV	The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell undervoltage condition.	The LVBMS detects a cell undervoltage condition affecting the LV battery.	The LV battery may be damaged and may be unable to support vehicle electrical systems.	No
VCBATT_a515_LVBMSFault_MOS_Open_cellOV	The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell overvoltage condition.	The LVBMS detects a cell overvoltage condition affecting the LV battery.	The LV battery may be damaged and may be unable to support vehicle electrical systems.	No
VCBATT_a516_hibernationActive	Vehicle will enter deep sleep to conserve energy in 10 minutes. It is possible to wake the vehicle up within the next 10 minutes by pressing the trunk button or applying external voltage to the front trunk (frunk) access posts.	The vehicle is in Transport Mode and the high voltage (HV) battery state of charge (SOC) is low.	Vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.	No
VCBATT_a540_leftFogLightGuideLightFault	An electrical error has been detected with the left fog light guide (white light pipe in front fascia that turns on along with fog light).	The high side driver (HSD) for the left fog light guide reports that an undercurrent or short circuit condition is present.	The left fog light guide may not be working.	No
VCDOORFL_a057_HVP_MIA	One or more of the expected messages the electronic control unit (ECU) receives periodically from the high voltage processor (HVP) ECU is not received, indicating the HVP may be unavailable (MIA).	One or more of the expected messages from the HVP ECU is not received.	Vehicle may be unable to drive. Charging may be limited or unavailable.	No
VCBATT_a494_LVBatteryTempBlockingOTA	The vehicle controller detects the low voltage (LV) battery is not within an acceptable temperature range to support vehicle electrical systems during an over-the-air (OTA) vehicle software update.	The vehicle controller detects the LV battery temperature dropping below -20 degrees Celsius for more than 5 consecutive seconds.	As the vehicle relies on LV battery support while installing software packages, any attempted vehicle software update will be blocked to prevent loss of electrical power during the update sequence.	No
VCBATT_a495_LVBatteryRecoveryBlocked	The vehicle controller detects a condition (or conditions) preventing the low voltage (LV) battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool.	A condition or combination of conditions prevents the LV battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. Alert log signal data should provide more information.	The LV battery cannot be recovered while any condition blocking its internal protection transistor (MOSFET) from closing persists. The LV battery is unable to support vehicle electrical systems or to recharge via the power conversion system (PCS) until the internal protection MOSFET closes and recovery begins.	No
VCBATT_a496_LVBatteryExitDriveWarning	The low voltage (LV) battery is in a critical state and the vehicle controller is about to trigger a graceful exit from drive (also known as a graceful power-off, or GPO). At least one other alert should be present when the vehicle starts to exit drive / graceful power-off occurs.	May set due to a condition or combination of conditions indicating the LV battery cannot support the vehicle, including: the LV battery internal protection transistor (MOSFET) is open, the reverse battery eFuse has tripped (is open), or the vehicle controller is actively shedding vehicle electrical loads to conserve energy for essential functions. Alert log signal data should provide more information.	The vehicle will exit drive within the next few minutes, with a separate alert present to indicate that condition, and the next drive cycle will be blocked.	No
VCBATT_a493_leftAuxParkLightFault	A fault has been detected with the left auxiliary park light (white light pipe in front fascia).	The HSD reports that an undercurrent or short circuit condition is present.	The left auxiliary light pipe may not be working.	No
VCBATT_a491_leftSideMarkerAuxParkLightFault	A fault has been detected with the left side marker (orange light in front fascia) and left auxiliary park light (white light pipe in front fascia).	The HSD reports that an undercurrent or short circuit condition is present.	The left side marker or left auxiliary park light (light pipe) may not be working.	No
VCBATT_a490_airSuspCompVoltageMismatch	There is a greater than 0.5V drop between input power to the vehicle battery controller (VCBATT) and the Air Suspension Compressor circuit.	0.5V difference between input voltage to the board and the eFuse.	Potential hardware issue could cause eFuse to trip or VOR.	No
VCBATT_a497_LVBatteryWarnDisconnect	The low voltage (LV) battery internal protection transistor (MOSFET) is open, while the LV battery is at low state of charge and recovering the MOSFET is not being attempted. As a result, the low voltage battery management system (LVBMS) continues to draw power from the cells, which may make the LV battery unrecoverable if it is not disconnected soon.	The LV battery state of charge (SOC) is less than 30%, the LV battery internal protection transistor (MOSFET) is open, and there are no low voltage battery management system (LVBMS) communication or firmware mismatch issues.	The LV battery may become too deeply discharged and unrecoverable.	No
VCBATT_a492_leftSideMarkerLightFault	A fault has been detected with the left side marker (amber light in front fascia, SAE markets only).	The HSD reports that an undercurrent or short circuit condition is present.	The left side marker may not be working.	No
VCBATT_a474_leftHeadlampInternalError	An internal condition affecting left headlamp functionality has been detected - certain light functions or the headlamp fan may be degraded or disabled	The SSL100 pixel matrix detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam Prefield, DRL segments, or Turn LEDs (Model S only) is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the SSL100 EEPROM are out of range, or the fan current is out of range.	Certain light functions or the headlamp fan may be degraded or disabled. These functions will retry after the next headlamp power cycle (which occurs during sleep)	No

VCDOORFL_a002_PowerLossReset

Warns if the processor has experienced a reset due to power loss.

Sudden power loss.

Controller is MIA for some time.

No

VCBATT_a527_LVBatteryCellImbalance

The low voltage battery management system (LVBMS) reports it has detected a low voltage (LV) battery cell voltage imbalance.

The LVBMS detects that all LV battery cell voltages are not within 150mV of each other.

The LV battery may suddenly become unavailable and unable to support vehicle electrical systems. The LV battery may require replacement, and a separate alert should be present to indicate this condition if applicable.

No

VCBATT_a517_hibernationRecovery

The vehicle is attempting to recover from a deep sleep. If the vehicle does not begin charging, the vehicle will reenter deep sleep after 10 minutes.

The vehicle is in Transport Mode, the high voltage (HV) battery state of charge (SOC) is low, and the user attempts to interact with the vehicle.

Vehicle requires charging before it can be recovered from deep sleep. Until adequately charged, the vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.

No

VCBATT_a518_LVBMSFault_MOS_Open_packOV

The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a pack overvoltage condition.

The LVBMS detects a pack overvoltage condition affecting the LV battery.

The LV battery may be damaged and may be unable to support vehicle electrical systems.

No

VCBATT_a528_LVBatteryCommsDiscnctd

The low voltage (LV) battery is not communicating as expected, indicating a potential disconnection with the vehicle controller.

Electronic connector position assurance (ECPA) state is signal not available (SNA), or the intelligent battery sensor (IBS) is not functioning as expected and the low voltage battery management system (LVBMS) is not communicating (MIA).

Loss of low voltage (LV) battery communication with vehicle controller, so the vehicle electrical system may only be supported via the power conversion system (PCS).

No

VCBATT_a521_vcleftEFuseLoadShed

The electrical current flowing through the left vehicle controller (VCLEFT) eFuse is greater or equal to 100A. The VCLEFT eFuse circuit may open (trip) if the low voltage (LV) electrical system loads are not reduced. The vehicle controller requests the VCLEFT to shed vehicle electrical loads by cutting power to the less essential loads.

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

Some convenience features controlled by the VCLEFT will be unavailable as the vehicle controller limits the LV electrical system current draw by cutting power to some loads.

No

VCBATT_a514_LVBMSFault_MOS_Open_cellUV

The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell undervoltage condition.

The LVBMS detects a cell undervoltage condition affecting the LV battery.

The LV battery may be damaged and may be unable to support vehicle electrical systems.

No

VCBATT_a515_LVBMSFault_MOS_Open_cellOV

The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell overvoltage condition.

The LVBMS detects a cell overvoltage condition affecting the LV battery.

The LV battery may be damaged and may be unable to support vehicle electrical systems.

No

VCBATT_a516_hibernationActive

Vehicle will enter deep sleep to conserve energy in 10 minutes. It is possible to wake the vehicle up within the next 10 minutes by pressing the trunk button or applying external voltage to the front trunk (frunk) access posts.

The vehicle is in Transport Mode and the high voltage (HV) battery state of charge (SOC) is low.

Vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.

No

VCBATT_a540_leftFogLightGuideLightFault

An electrical error has been detected with the left fog light guide (white light pipe in front fascia that turns on along with fog light).

The high side driver (HSD) for the left fog light guide reports that an undercurrent or short circuit condition is present.

The left fog light guide may not be working.

No

VCDOORFL_a057_HVP_MIA

One or more of the expected messages the electronic control unit (ECU) receives periodically from the high voltage processor (HVP) ECU is not received, indicating the HVP may be unavailable (MIA).

One or more of the expected messages from the HVP ECU is not received.

Vehicle may be unable to drive. Charging may be limited or unavailable.

No

VCBATT_a494_LVBatteryTempBlockingOTA

The vehicle controller detects the low voltage (LV) battery is not within an acceptable temperature range to support vehicle electrical systems during an over-the-air (OTA) vehicle software update.

The vehicle controller detects the LV battery temperature dropping below -20 degrees Celsius for more than 5 consecutive seconds.

As the vehicle relies on LV battery support while installing software packages, any attempted vehicle software update will be blocked to prevent loss of electrical power during the update sequence.

No

VCBATT_a495_LVBatteryRecoveryBlocked

The vehicle controller detects a condition (or conditions) preventing the low voltage (LV) battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool.

A condition or combination of conditions prevents the LV battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. Alert log signal data should provide more information.

The LV battery cannot be recovered while any condition blocking its internal protection transistor (MOSFET) from closing persists. The LV battery is unable to support vehicle electrical systems or to recharge via the power conversion system (PCS) until the internal protection MOSFET closes and recovery begins.

No

VCBATT_a496_LVBatteryExitDriveWarning

The low voltage (LV) battery is in a critical state and the vehicle controller is about to trigger a graceful exit from drive (also known as a graceful power-off, or GPO). At least one other alert should be present when the vehicle starts to exit drive / graceful power-off occurs.

May set due to a condition or combination of conditions indicating the LV battery cannot support the vehicle, including: the LV battery internal protection transistor (MOSFET) is open, the reverse battery eFuse has tripped (is open), or the vehicle controller is actively shedding vehicle electrical loads to conserve energy for essential functions. Alert log signal data should provide more information.

The vehicle will exit drive within the next few minutes, with a separate alert present to indicate that condition, and the next drive cycle will be blocked.

No

VCBATT_a493_leftAuxParkLightFault

A fault has been detected with the left auxiliary park light (white light pipe in front fascia).

The HSD reports that an undercurrent or short circuit condition is present.

The left auxiliary light pipe may not be working.

No

VCBATT_a491_leftSideMarkerAuxParkLightFault

A fault has been detected with the left side marker (orange light in front fascia) and left auxiliary park light (white light pipe in front fascia).

The HSD reports that an undercurrent or short circuit condition is present.

The left side marker or left auxiliary park light (light pipe) may not be working.

No

VCBATT_a490_airSuspCompVoltageMismatch

There is a greater than 0.5V drop between input power to the vehicle battery controller (VCBATT) and the Air Suspension Compressor circuit.

0.5V difference between input voltage to the board and the eFuse.

Potential hardware issue could cause eFuse to trip or VOR.

No

VCBATT_a497_LVBatteryWarnDisconnect

The low voltage (LV) battery internal protection transistor (MOSFET) is open, while the LV battery is at low state of charge and recovering the MOSFET is not being attempted. As a result, the low voltage battery management system (LVBMS) continues to draw power from the cells, which may make the LV battery unrecoverable if it is not disconnected soon.

The LV battery state of charge (SOC) is less than 30%, the LV battery internal protection transistor (MOSFET) is open, and there are no low voltage battery management system (LVBMS) communication or firmware mismatch issues.

The LV battery may become too deeply discharged and unrecoverable.

No

VCBATT_a492_leftSideMarkerLightFault

A fault has been detected with the left side marker (amber light in front fascia, SAE markets only).

The HSD reports that an undercurrent or short circuit condition is present.

The left side marker may not be working.

No

VCBATT_a474_leftHeadlampInternalError

An internal condition affecting left headlamp functionality has been detected - certain light functions or the headlamp fan may be degraded or disabled

The SSL100 pixel matrix detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam Prefield, DRL segments, or Turn LEDs (Model S only) is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the SSL100 EEPROM are out of range, or the fan current is out of range.

Certain light functions or the headlamp fan may be degraded or disabled. These functions will retry after the next headlamp power cycle (which occurs during sleep)

No

Alerts

Alerts