MyTeslaMate App

Signal Name	Description	Condition	Impact
VCFRONT_a562_LVBMSModuleOvertemperature	The Low Voltage Battery Management System (LVBMS) detects that the low voltage (LV) battery pack is experiencing high temperatures.	The LVBMS module temperature has reached 60 deg C for 1 second.	The low voltage (LV) battery may show degraded performance or become unavailable due to high temperatures.
VCFRONT_a563_chargePortDoorOpenBlockedByBrake	Charge Port door open request not honored because brake is pressed.	The UI requests charge port door open while the customer has brake pedal pressed.	The vehicle will not allow the charge port door to open.
VCFRONT_a560_compressorHighSuperheat	The vehicle controller detects a refrigerant condition, such as low refrigerant or a blocked refrigerator filter, which may prevent the A/C compressor from operating as expected due to high suction superheat if no other heat pump modes are available.	The vehicle controller detects low refrigerant, a blocked refrigerant filter, or other refrigerant related conditions on the A/C compressor.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a624_rightHeadlampInternalErrorV4	The front vehicle controller (VCFRONT) detects a condition affecting the functionality of the right headlight.	The voltage measured across the boost rail, high beam, low beam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the headlamp EEPROM are out of range.	Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.
VCFRONT_a553_rightHeadlampSoftShort	Right headlamp powered off due to a short circuit detected on the right headlamp power rail.	The headlamp current is above 9A for greater than 10s	All right headlamp lighting functions (low beam, high beam, turn signal, etc) may be degraded or unavailable
VCFRONT_a552_eFuseSelfTestFailure	The front vehicle controller has detected a problem during an eFuse self-test.	Voltage conditions during the self-test sequence are not met.	An eFuse may be unable to turn off or on. Front vehicle controller (VCFRONT) may not function as expected.
VCFRONT_a555_LVBatteryCellRebalancing	The low voltage battery management system (LVBMS) reports it has detected a low voltage (LV) battery cell voltage imbalance and is attempting to rebalance the cell voltages. The vehicle will be kept awake to support the LV battery until the rebalancing attempt is complete.	The LVBMS detects that all LV battery cell voltages are not within 100mV 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.
VCFRONT_a559_LVBatteryLowSOC	The low voltage battery management system (LVBMS) reports the low voltage (LV) battery has a reduced state of charge (SOC), which may lead to the LVBMS opening the LV battery internal protection transistor (MOSFET).	The LVBMS detects the LV battery SOC is below 15% for 5 seconds.	The LV battery may be unable to support vehicle electrical systems.
VCFRONT_a547_postCrashLoadShed	The vehicle controller is loadshedding due to a vehicle collision. Make sure the vehicle is safe to re-energize before using the Clear Post-Crash Loadshedding (PROC_VCFRONT_X_CLEAR-POST-CRASH-LOADSHEDDING) routine to resume all low voltage electrical system features and enable high voltage system again.	Vehicle collision is detected.	High voltage system is unavailable. Low voltage electrical system features are limited to conserve energy for essential functions.
VCFRONT_a546_leftLowOrHighBeamLightCondition	A condition affecting left low beam (dipped beam) or high beam (main beam) functionality has been detected - the left low beam or high beam may be degraded or disabled.	An internal condition affecting the low beam (dipped beam) or high beam (main beam) LEDs, pixels, or the headlamp ECU's LED drivers is detected.	Left low beam (dipped beam) or high beam (main beam) may be partially or fully disabled.
VCFRONT_a548_HVFaultLoadShed	The low voltage (LV) battery is discharging, even though high voltage (HV) system support has been requested. Vehicle loadshedding will occur, and a separate alert will be present to indicate that condition.	LV battery is being discharged, even though the HV system should be supporting both the LV battery and the LV bus.	Vehicle loadshedding is triggered, and a separate alert will be present to indicate that condition and its impacts.
VCFRONT_a549_leftHeadlampInternalErrorV3	The Left Headlight Control Module (HCML) detects an internal condition affecting the functionality of the left headlight, which is reported to the front vehicle controller (VCFRONT).	The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range.	Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.
VCFRONT_a551_leftHeadlampSoftShort	Left headlamp powered off due to a short circuit detected on the left headlamp power rail.	The headlamp current is above 9A for greater than 10s	All left headlamp lighting functions (low beam, high beam, turn signal, etc) may be degraded or unavailable
VCFRONT_a566_leftFrontTurnLightFault	A condition affecting left front turn signal functionality has been detected - the left front turn signal may be degraded or disabled, and remaining left side turn signals will fast blink.	The headlamp ECU is MIA on LIN (not responding to Local Interconnect Network traffic) while powered on, or an internal condition with the turn signal LEDs or the headlamp ECU's LED driver is detected.	Left side turn signals will fast blink
VCFRONT_a568_leftDaytimeRunningLightFault	A condition affecting left daytime running light (DRL) functionality has been detected - the left daytime running light may be degraded or disabled.	An internal condition with the daytime running light (DRL) LEDs or the headlamp ECU's LED driver is detected.	Left daytime running light (DRL) may be partially or fully disabled
VCFRONT_a540_rightFogLightGuideLightFault	An electrical error has been detected with the right fog light guide (white light pipe in front fascia that turns on along with fog light).	The high side driver (HSD) for the right fog light guide reports that an undercurrent or short circuit condition is present.	The right fog light guide may not be working.
VCFRONT_a541_LVBatteryChargeOCLevel1	The low voltage battery management system (LVBMS) reports it has detected the charge current is above the maximum limit for the low voltage (LV) battery cells in their present condition.	The LVBMS detects the charge current is above the maximum limit for the LV battery cells in their present condition for 1 second.	Exceeding charge current limits may shorten the life of LV battery cells, leading to accelerated degradation and replacement.
VCFRONT_a543_compressorLowFlowDeliveryDetected	The vehicle controller detected that the compressor delivered much less refrigerant flow than nominal and discharge temperature was abnormally high.	The vehicle detects at least two of the following: refrigerant flow delivered by compressor is abnoramlly low by referring to EXV opening or cabin heating capacity, and discharge temperature is abnoramlly high.	The thermal system may not perform as expected and compressor has high risk of loss of isolation due to debris.
VCFRONT_a557_rightHeadlampInternalErrorV3	The Right Headlight Control Module (HCMR) detects an internal condition affecting the functionality of the right headlight, which is reported to the front vehicle controller (VCFRONT).	The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range.	Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.
VCFRONT_a531_lowPowerIndexFlaggedUserFacing	The compressor power index is lower than expected, which typically indicates a condition affecting the compressor. This can also indicate a condition affecting the discharge or suction pressure sensors. The compressor power index measures the ratio of estimated nominal compressor power consumption against electrical power the compressor actually consumes. A low index value indicates the compressor is drawing / consuming significantly more power than a nominal compressor would be expected to consume.	The compressor power index, which compares expected compressor power consumption against actual consumption, drops below expected levels.	Thermal system may show reduced effectiveness. Cabin climate control performance may be limited, with cabin heating / cooling not performing at expected levels.

VCFRONT_a562_LVBMSModuleOvertemperature

The Low Voltage Battery Management System (LVBMS) detects that the low voltage (LV) battery pack is experiencing high temperatures.

The LVBMS module temperature has reached 60 deg C for 1 second.

The low voltage (LV) battery may show degraded performance or become unavailable due to high temperatures.

VCFRONT_a563_chargePortDoorOpenBlockedByBrake

Charge Port door open request not honored because brake is pressed.

The UI requests charge port door open while the customer has brake pedal pressed.

The vehicle will not allow the charge port door to open.

VCFRONT_a560_compressorHighSuperheat

The vehicle controller detects a refrigerant condition, such as low refrigerant or a blocked refrigerator filter, which may prevent the A/C compressor from operating as expected due to high suction superheat if no other heat pump modes are available.

The vehicle controller detects low refrigerant, a blocked refrigerant filter, or other refrigerant related conditions on the A/C compressor.

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

VCFRONT_a624_rightHeadlampInternalErrorV4

The front vehicle controller (VCFRONT) detects a condition affecting the functionality of the right headlight.

The voltage measured across the boost rail, high beam, low beam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the headlamp EEPROM are out of range.

Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.

VCFRONT_a553_rightHeadlampSoftShort

Right headlamp powered off due to a short circuit detected on the right headlamp power rail.

The headlamp current is above 9A for greater than 10s

All right headlamp lighting functions (low beam, high beam, turn signal, etc) may be degraded or unavailable

VCFRONT_a552_eFuseSelfTestFailure

The front vehicle controller has detected a problem during an eFuse self-test.

Voltage conditions during the self-test sequence are not met.

An eFuse may be unable to turn off or on. Front vehicle controller (VCFRONT) may not function as expected.

VCFRONT_a555_LVBatteryCellRebalancing

The low voltage battery management system (LVBMS) reports it has detected a low voltage (LV) battery cell voltage imbalance and is attempting to rebalance the cell voltages. The vehicle will be kept awake to support the LV battery until the rebalancing attempt is complete.

The LVBMS detects that all LV battery cell voltages are not within 100mV 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.

VCFRONT_a559_LVBatteryLowSOC

The low voltage battery management system (LVBMS) reports the low voltage (LV) battery has a reduced state of charge (SOC), which may lead to the LVBMS opening the LV battery internal protection transistor (MOSFET).

The LVBMS detects the LV battery SOC is below 15% for 5 seconds.

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

VCFRONT_a547_postCrashLoadShed

The vehicle controller is loadshedding due to a vehicle collision. Make sure the vehicle is safe to re-energize before using the Clear Post-Crash Loadshedding (PROC_VCFRONT_X_CLEAR-POST-CRASH-LOADSHEDDING) routine to resume all low voltage electrical system features and enable high voltage system again.

Vehicle collision is detected.

High voltage system is unavailable. Low voltage electrical system features are limited to conserve energy for essential functions.

VCFRONT_a546_leftLowOrHighBeamLightCondition

A condition affecting left low beam (dipped beam) or high beam (main beam) functionality has been detected - the left low beam or high beam may be degraded or disabled.

An internal condition affecting the low beam (dipped beam) or high beam (main beam) LEDs, pixels, or the headlamp ECU's LED drivers is detected.

Left low beam (dipped beam) or high beam (main beam) may be partially or fully disabled.

VCFRONT_a548_HVFaultLoadShed

The low voltage (LV) battery is discharging, even though high voltage (HV) system support has been requested. Vehicle loadshedding will occur, and a separate alert will be present to indicate that condition.

LV battery is being discharged, even though the HV system should be supporting both the LV battery and the LV bus.

Vehicle loadshedding is triggered, and a separate alert will be present to indicate that condition and its impacts.

VCFRONT_a549_leftHeadlampInternalErrorV3

The Left Headlight Control Module (HCML) detects an internal condition affecting the functionality of the left headlight, which is reported to the front vehicle controller (VCFRONT).

The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range.

Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.

VCFRONT_a551_leftHeadlampSoftShort

Left headlamp powered off due to a short circuit detected on the left headlamp power rail.

The headlamp current is above 9A for greater than 10s

All left headlamp lighting functions (low beam, high beam, turn signal, etc) may be degraded or unavailable

VCFRONT_a566_leftFrontTurnLightFault

A condition affecting left front turn signal functionality has been detected - the left front turn signal may be degraded or disabled, and remaining left side turn signals will fast blink.

The headlamp ECU is MIA on LIN (not responding to Local Interconnect Network traffic) while powered on, or an internal condition with the turn signal LEDs or the headlamp ECU's LED driver is detected.

Left side turn signals will fast blink

VCFRONT_a568_leftDaytimeRunningLightFault

A condition affecting left daytime running light (DRL) functionality has been detected - the left daytime running light may be degraded or disabled.

An internal condition with the daytime running light (DRL) LEDs or the headlamp ECU's LED driver is detected.

Left daytime running light (DRL) may be partially or fully disabled

VCFRONT_a540_rightFogLightGuideLightFault

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

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

The right fog light guide may not be working.

VCFRONT_a541_LVBatteryChargeOCLevel1

The low voltage battery management system (LVBMS) reports it has detected the charge current is above the maximum limit for the low voltage (LV) battery cells in their present condition.

The LVBMS detects the charge current is above the maximum limit for the LV battery cells in their present condition for 1 second.

Exceeding charge current limits may shorten the life of LV battery cells, leading to accelerated degradation and replacement.

VCFRONT_a543_compressorLowFlowDeliveryDetected

The vehicle controller detected that the compressor delivered much less refrigerant flow than nominal and discharge temperature was abnormally high.

The vehicle detects at least two of the following: refrigerant flow delivered by compressor is abnoramlly low by referring to EXV opening or cabin heating capacity, and discharge temperature is abnoramlly high.

The thermal system may not perform as expected and compressor has high risk of loss of isolation due to debris.

VCFRONT_a557_rightHeadlampInternalErrorV3

The Right Headlight Control Module (HCMR) detects an internal condition affecting the functionality of the right headlight, which is reported to the front vehicle controller (VCFRONT).

The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam, DRL, Side Marker, or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range.

Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.

VCFRONT_a531_lowPowerIndexFlaggedUserFacing

The compressor power index is lower than expected, which typically indicates a condition affecting the compressor. This can also indicate a condition affecting the discharge or suction pressure sensors. The compressor power index measures the ratio of estimated nominal compressor power consumption against electrical power the compressor actually consumes. A low index value indicates the compressor is drawing / consuming significantly more power than a nominal compressor would be expected to consume.

The compressor power index, which compares expected compressor power consumption against actual consumption, drops below expected levels.

Thermal system may show reduced effectiveness. Cabin climate control performance may be limited, with cabin heating / cooling not performing at expected levels.

Alerts

Alerts