MyTeslaMate App

Signal Name	Description	Condition	Impact
VCFRONT_a196_discnctdLVBattery	The low voltage (LV) battery is disconnected.	No current flow detected to / from the low voltage (LV) battery for an extended time period.	Loss of support from the low voltage (LV) battery, so the vehicle electrical system is only supported via the power conversion system (PCS). Lead acid only: Some vehicle features may be unavailable due to load shedding. There should be another alert present to indicate this.
VCFRONT_a264_iBoosterVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the braking assist circuit for the iBooster (IBST) electronic control unit (ECU).	The voltage mismatch is greater than 0.5V between the VCFRONT printed circuit board assembly (PCBA) input voltage and the eFuse output voltage.	Vehicle functions that rely on the iBooster may be limited or may not function as expected.
VCFRONT_a267_EPAS3sVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the secondary power steering circuit for the secondary Electronic Power Assisted Steering (EPAS3S) electronic control unit (ECU).	The voltage mismatch is greater than 0.5V between the VCFRONT printed circuit board assembly (PCBA) input voltage and the eFuse output voltage.	Power steering may be limited or unavailable.
VCFRONT_a303_frunkAccessPostActive	The front vehicle controller (VCFRONT) detects more than 8V on the front trunk (also known as the frunk) access post, which may cause the frunk to open if the vehicle is stationary.	The VCFRONT detects a frunk access post voltage of more than 8V.	If the vehicle is stationary, the frunk may open.
VCFRONT_a268_vbatFusedVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input voltage to the VCFRONT printed circuit board assembly (PCBA) and the internally fused VCFRONT low voltage (LV) Battery Power (VBAT Fused) circuit (or eFuse) output voltage.	The voltage mismatch is greater than 0.5V between the VCFRONT PCBA input voltage and the eFuse output voltage.	Vehicle functions that rely on the VCFRONT may be limited or may not function as expected.
VCFRONT_a195_drveBlckdVltgeTooHgh	The vehicle cannot enter Drive state because the measured low voltage (LV) battery voltage is too high.	The measured LV battery voltage is greater than 16V for 3 consecutive seconds.	Vehicle may be unable to drive, or may take longer than expected to enter Drive state. Voltage regulation performance may be reduced across the low voltage electrical system.
VCFRONT_a301_wipersFactoryDisabled	The wipers have been disabled while the vehicle is in Factory Mode. The wiper enable routine must be run to restore wiper function.	The vehicle is in Factory Mode and no communication from the wipers over local interconnect network (LIN) has been detected for more than 1 second.	No wiper movement or function, even if wipers are connected.
VCFRONT_a297_TLVBMS_BmbHwOverTemperatureFault	A Battery Monitoring Board (BMB) device has detected an over temperature condition	Any BMB device in the daisy chain detects an over temperature condition	May indicate the battery pack is operating under unintended conditions. This alert may result in loss of pack power
VCFRONT_a302_wiperCommError	The front vehicle controller detects a wiper module communication error, indicating the wiper module may be disconnected.	The wiper module is powered for more than 500 ms and wiper communication errors over local interconnect network (LIN) are reported.	No wiper functionality.
VCFRONT_a288_ccLeftExvFault	The vehicle controller detects the left cabin condenser electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The left cabin condenser EXV motor driver reports an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a287_lccExvFault	The vehicle controller detects the Liquid Cooled Condenser (LCC) electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The LCC EXV motor driver is reporting an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a289_ccRightExvFault	The vehicle controller detects the right cabin condenser electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The right cabin condenser EXV motor driver reports an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a285_evaporatorExvFault	The vehicle controller detects the evaporator electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The evaporator EXV motor driver is reporting an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a284_chillerExvFault	The vehicle controller detects the chiller electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The chiller EXV motor driver is reporting an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a199_PRVCANUndertrminate	The adjustable termination for the private controller area network (CAN) bus is off (not active) when it should be turned on (active).	Adjustable termination is off (not active), and the vehicle is rear wheel drive (RWD) configuration (no secondary drive inverter exists) or the secondary drive inverter (DIS) is not connected to CAN.	The private CAN bus may not function as expected.
VCFRONT_a286_recircExvFault	The vehicle controller detects the recirculation electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).	The recirculation EXV motor driver is reporting an electrical condition (short or disconnect).	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a279_refrigLiquidTempSns	The vehicle controller detects the refrigerant liquid temperature sensor is experiencing an electrical condition (short or disconnect).	The refrigerant liquid temperature sensor reads a power rail or ground reference voltage.	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a256_compTornShaftSeal	The front vehicle controller (VCFRONT) detects the refrigerant compressor is reporting a shaft seal breakage.	The refrigerant compressor reports a shaft seal breakage.	Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a280_refrigLiquidPresSns	The vehicle controller detects the refrigerant liquid pressure sensor is experiencing an electrical condition (short or disconnect).	The refrigerant liquid pressure sensor reads a power rail or ground reference voltage.	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a259_LVVoltageDropOnHighLoadCurrent	The vehicle controller detects the low voltage (LV) battery voltage is lower than expected during a precharge event. When this occurs too many times, separate alerts will also be present to indicate precharging the high voltage (HV) bus may not succeed and the LV battery may need replacement.	An instant resistance check of the LV battery connections to the vehicle controller does not succeed (does not return a healthy result). Alert log signal data should provide more information on specifics, including load current, LV battery temperature, and any detected voltage dip.	The LV battery may be unable to support vehicle electrical systems, including precharging the high voltage (HV) bus.

VCFRONT_a196_discnctdLVBattery

The low voltage (LV) battery is disconnected.

No current flow detected to / from the low voltage (LV) battery for an extended time period.

Loss of support from the low voltage (LV) battery, so the vehicle electrical system is only supported via the power conversion system (PCS). Lead acid only: Some vehicle features may be unavailable due to load shedding. There should be another alert present to indicate this.

VCFRONT_a264_iBoosterVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the braking assist circuit for the iBooster (IBST) electronic control unit (ECU).

The voltage mismatch is greater than 0.5V between the VCFRONT printed circuit board assembly (PCBA) input voltage and the eFuse output voltage.

Vehicle functions that rely on the iBooster may be limited or may not function as expected.

VCFRONT_a267_EPAS3sVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the secondary power steering circuit for the secondary Electronic Power Assisted Steering (EPAS3S) electronic control unit (ECU).

The voltage mismatch is greater than 0.5V between the VCFRONT printed circuit board assembly (PCBA) input voltage and the eFuse output voltage.

Power steering may be limited or unavailable.

VCFRONT_a303_frunkAccessPostActive

The front vehicle controller (VCFRONT) detects more than 8V on the front trunk (also known as the frunk) access post, which may cause the frunk to open if the vehicle is stationary.

The VCFRONT detects a frunk access post voltage of more than 8V.

If the vehicle is stationary, the frunk may open.

VCFRONT_a268_vbatFusedVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input voltage to the VCFRONT printed circuit board assembly (PCBA) and the internally fused VCFRONT low voltage (LV) Battery Power (VBAT Fused) circuit (or eFuse) output voltage.

The voltage mismatch is greater than 0.5V between the VCFRONT PCBA input voltage and the eFuse output voltage.

Vehicle functions that rely on the VCFRONT may be limited or may not function as expected.

VCFRONT_a195_drveBlckdVltgeTooHgh

The vehicle cannot enter Drive state because the measured low voltage (LV) battery voltage is too high.

The measured LV battery voltage is greater than 16V for 3 consecutive seconds.

Vehicle may be unable to drive, or may take longer than expected to enter Drive state. Voltage regulation performance may be reduced across the low voltage electrical system.

VCFRONT_a301_wipersFactoryDisabled

The wipers have been disabled while the vehicle is in Factory Mode. The wiper enable routine must be run to restore wiper function.

The vehicle is in Factory Mode and no communication from the wipers over local interconnect network (LIN) has been detected for more than 1 second.

No wiper movement or function, even if wipers are connected.

VCFRONT_a297_TLVBMS_BmbHwOverTemperatureFault

A Battery Monitoring Board (BMB) device has detected an over temperature condition

Any BMB device in the daisy chain detects an over temperature condition

May indicate the battery pack is operating under unintended conditions. This alert may result in loss of pack power

VCFRONT_a302_wiperCommError

The front vehicle controller detects a wiper module communication error, indicating the wiper module may be disconnected.

The wiper module is powered for more than 500 ms and wiper communication errors over local interconnect network (LIN) are reported.

No wiper functionality.

VCFRONT_a288_ccLeftExvFault

The vehicle controller detects the left cabin condenser electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The left cabin condenser EXV motor driver reports an electrical condition (short or disconnect).

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

VCFRONT_a287_lccExvFault

The vehicle controller detects the Liquid Cooled Condenser (LCC) electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The LCC EXV motor driver is reporting an electrical condition (short or disconnect).

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

VCFRONT_a289_ccRightExvFault

The vehicle controller detects the right cabin condenser electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The right cabin condenser EXV motor driver reports an electrical condition (short or disconnect).

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

VCFRONT_a285_evaporatorExvFault

The vehicle controller detects the evaporator electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The evaporator EXV motor driver is reporting an electrical condition (short or disconnect).

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

VCFRONT_a284_chillerExvFault

The vehicle controller detects the chiller electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The chiller EXV motor driver is reporting an electrical condition (short or disconnect).

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

VCFRONT_a199_PRVCANUndertrminate

The adjustable termination for the private controller area network (CAN) bus is off (not active) when it should be turned on (active).

Adjustable termination is off (not active), and the vehicle is rear wheel drive (RWD) configuration (no secondary drive inverter exists) or the secondary drive inverter (DIS) is not connected to CAN.

The private CAN bus may not function as expected.

VCFRONT_a286_recircExvFault

The vehicle controller detects the recirculation electronic expansion valve (EXV) motor driver is reporting an electrical condition (short or disconnect).

The recirculation EXV motor driver is reporting an electrical condition (short or disconnect).

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

VCFRONT_a279_refrigLiquidTempSns

The vehicle controller detects the refrigerant liquid temperature sensor is experiencing an electrical condition (short or disconnect).

The refrigerant liquid temperature sensor reads a power rail or ground reference voltage.

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

VCFRONT_a256_compTornShaftSeal

The front vehicle controller (VCFRONT) detects the refrigerant compressor is reporting a shaft seal breakage.

The refrigerant compressor reports a shaft seal breakage.

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

VCFRONT_a280_refrigLiquidPresSns

The vehicle controller detects the refrigerant liquid pressure sensor is experiencing an electrical condition (short or disconnect).

The refrigerant liquid pressure sensor reads a power rail or ground reference voltage.

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

VCFRONT_a259_LVVoltageDropOnHighLoadCurrent

The vehicle controller detects the low voltage (LV) battery voltage is lower than expected during a precharge event. When this occurs too many times, separate alerts will also be present to indicate precharging the high voltage (HV) bus may not succeed and the LV battery may need replacement.

An instant resistance check of the LV battery connections to the vehicle controller does not succeed (does not return a healthy result). Alert log signal data should provide more information on specifics, including load current, LV battery temperature, and any detected voltage dip.

The LV battery may be unable to support vehicle electrical systems, including precharging the high voltage (HV) bus.

Alerts

Alerts