MyTeslaMate App

Signal Name	Description	Condition	Impact
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_a200_vcleftSelfTestFail	The front vehicle controller (VCFRONT) has detected a condition affecting the left vehicle controller (VCLEFT) low voltage (LV) power feed circuit (eFuse) during a self-test.	Required voltage conditions are not met during the self-test sequence.	The low voltage (LV) power feed circuit (eFuse) may be unable to regulate (turn on or off) the power supply to VCLEFT, which could make vehicle functions relying on VCLEFT limited or unavailable.
VCFRONT_a266_EPAS3pVoltageMismatch	The vehicle controller detects there is voltage mismatch greater than 0.5V between the input power to the front vehicle controller (VCFRONT) and the primary power steering circuit for the primary Electronic Power Assisted Steering (EPAS3P) 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_a201_vcrightSelfTestFail	The front vehicle controller (VCFRONT) has detected a condition affecting the right vehicle controller (VCRIGHT) low voltage (LV) power feed circuit (eFuse) during a self-test.	Required voltage conditions are not met during the self-test sequence.	The low voltage (LV) power feed circuit (eFuse) may be unable to regulate (turn on or off) the power supply to VCRIGHT, which could make vehicle functions relying on VCRIGHT limited or unavailable.
VCFRONT_a224_revBatChrgPmpFault	The front vehicle controller (VCFRONT) has detected a condition affecting the reverse battery charge pump.	VCFRONT detects a high drop in voltage across protection field effect transistors (FETs) is high or the charge pump voltage is low.	The DCDC converter may not enable, resulting in no power conversion system (PCS) support for the low voltage (LV) battery and electrical system.
VCFRONT_a188_sleepFailed	The front vehicle controller was not able to go to sleep.	The front vehicle controller started sleep sequence but was aborted.	Higher SoC loss than expected, higher 12V draw than expected, possible unexpected alerts.
VCFRONT_a189_IBSMIA	One or more of the serial peripheral interface (SPI) messages the vehicle controller receives periodically from the Intelligent Battery Sensor (IBS) is not received, indicating the IBS may be unavailable (MIA).	The vehicle controller does not receive one or more of the expected SPI messages from the IBS within the expected time frame.	The vehicle may not sleep, and the low voltage (LV) battery may be overcharged or undercharged.
VCFRONT_a191_exitDriveLowLVBusVoltage	An issue with the low voltage (LV) electrical system requires the vehicle to come to a stop immediately. The vehicle should enter graceful power-off (GPO) to exit drive, and a separate alert should indicate that condition.	Lead acid: Low voltage (LV) battery voltage below threshold for 3 seconds (3s); transistor gating LV battery connection is open (no current flow); vehicle load shedding is active; or reverse battery transistor issue detected.	The vehicle will not enter drive. If the vehicle is driving, it will exit drive through graceful power-off (GPO) to come to a stop immediately. A separate alert should be present to indicate the GPO
VCFRONT_a192_vehicleLoadShed	The low voltage (LV) battery is no longer supported by the power conversion system (PCS). The vehicle low voltage electrical system needs to shed electrical loads by cutting power to some systems / electronic control units (ECUs).	Lead acid: low voltage (LV) battery voltage below 12.2V while high voltage (HV) support from the power conversion system (PCS) is requested; Li-ion: low voltage (LV) battery is not supported by the power conversion system (PCS), or the vehicle has experienced a crash event	Lead acid: Convenience features such as seat heaters, auxiliary ports, and HVAC will no longer be available. Li-ion: All nonessential features / components will no longer be available, with support reserved for critical functions like operating doors, windows, exterior lights, and front trunk (frunk).
VCFRONT_a193_mcuAudioRetry	The vehicle controller detects the Media Control Unit (MCU) audio eFuse experienced a trip due to inrush current. While the vehicle controller attempts to provide power by reseting the MCU audio eFuse, a loss of audio may occur.	The MCU eFuse experiences a false trip while the vehicle transitions into the CONDITIONING, ACCESSORY, or DRIVE vehicle power states.	The audio may be unavailable or may cut out periodically.
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_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_a194_iBoosterRetry	The electromechanical brake booster (iBooster) eFuse was retried because it tripped (circuit opened) due to inrush current when enabled by the front vehicle controller (VCFRONT).	On transition into the ACCESSORY vehicle power state, if the iBooster eFuse tripped (circuit opened) within 1 second of the enable line going high (power applied to the iBooster by the VCFRONT).	Braking functionality may be limited.
VCFRONT_a270_prechargeFailed	The Front Vehicle Controller (VCFRONT) sleep bypass did not raise the voltage to the target voltage in the expected amount of time.	The load voltage does not meet the power source voltage in the expected amount of time.	The load being precharged may not turn on. Vehicle functions relying on the load being precharged may not operate as expected.
VCFRONT_a142_exvMotorFault	The front vehicle controller (VCFRONT) detects the chiller electronic expansion valve (EXV) motor driver is experiencing an electrical condition (short or disconnect).	The chiller EXV motor driver is experiencing an electrical condition (short or disconnect).	Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a143_pumpBatICTransFault	The vehicle controller detects the LV8907 integrated circuit on the battery pump motor issued a circuit warning, which may prevent the battery pump from running as expected.	The LV8907 integrated circuit on the on the battery pump motor issues a circuit warning that prevents the motor controller from driving the motor.	Powertrain performance may be limited.
VCFRONT_a136_refrigDischTempSns	The front vehicle controller (VCFRONT) detects the refrigerant discharge temperature sensor is experiencing an electrical condition (short or disconnect).	The refrigerant discharge temperature sensor reads a power rail or ground reference voltage.	Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a137_refrigDischPresSns	The front vehicle controller (VCFRONT) detects the refrigerant discharge pressure sensor is experiencing an electrical condition (short or disconnect).	The refrigerant discharge pressure sensor reads a power rail or ground reference voltage.	Cabin climate control system air conditioning may be limited or unavailable. Powertrain performance may be limited.
VCFRONT_a134_fusedHighEFuseTrip	The front vehicle controller (VCFRONT) fused high current eFuse circuit is open (tripped), interrupting low voltage (LV) power feed to the coolant pumps and condenser fan. HVAC cabin cooling (air conditioning) and powertrain performance may be limited.	VCFRONT detects the fused high current eFuse circuit is open (tripped).	The coolant pumps and condenser fan will be unavailable. As a result, the power conversion system (PCS) temperature may exceed normal operational range. HVAC cabin cooling (air conditioning) and powertrain performance may be limited.
VCFRONT_a135_coolantLevelLow	The front vehicle controller (VCFRONT) detects the coolant level sensor is reporting a low coolant level or is experiencing an electrical condition (short or disconnect).	The coolant level sensor reports low coolant or is experiencing an electrical condition (short or disconnect).	Cabin climate control system air conditioning 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_a200_vcleftSelfTestFail

The front vehicle controller (VCFRONT) has detected a condition affecting the left vehicle controller (VCLEFT) low voltage (LV) power feed circuit (eFuse) during a self-test.

Required voltage conditions are not met during the self-test sequence.

The low voltage (LV) power feed circuit (eFuse) may be unable to regulate (turn on or off) the power supply to VCLEFT, which could make vehicle functions relying on VCLEFT limited or unavailable.

VCFRONT_a266_EPAS3pVoltageMismatch

The vehicle controller detects there is voltage mismatch greater than 0.5V between the input power to the front vehicle controller (VCFRONT) and the primary power steering circuit for the primary Electronic Power Assisted Steering (EPAS3P) 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_a201_vcrightSelfTestFail

The front vehicle controller (VCFRONT) has detected a condition affecting the right vehicle controller (VCRIGHT) low voltage (LV) power feed circuit (eFuse) during a self-test.

Required voltage conditions are not met during the self-test sequence.

The low voltage (LV) power feed circuit (eFuse) may be unable to regulate (turn on or off) the power supply to VCRIGHT, which could make vehicle functions relying on VCRIGHT limited or unavailable.

VCFRONT_a224_revBatChrgPmpFault

The front vehicle controller (VCFRONT) has detected a condition affecting the reverse battery charge pump.

VCFRONT detects a high drop in voltage across protection field effect transistors (FETs) is high or the charge pump voltage is low.

The DCDC converter may not enable, resulting in no power conversion system (PCS) support for the low voltage (LV) battery and electrical system.

VCFRONT_a188_sleepFailed

The front vehicle controller was not able to go to sleep.

The front vehicle controller started sleep sequence but was aborted.

Higher SoC loss than expected, higher 12V draw than expected, possible unexpected alerts.

VCFRONT_a189_IBSMIA

One or more of the serial peripheral interface (SPI) messages the vehicle controller receives periodically from the Intelligent Battery Sensor (IBS) is not received, indicating the IBS may be unavailable (MIA).

The vehicle controller does not receive one or more of the expected SPI messages from the IBS within the expected time frame.

The vehicle may not sleep, and the low voltage (LV) battery may be overcharged or undercharged.

VCFRONT_a191_exitDriveLowLVBusVoltage

An issue with the low voltage (LV) electrical system requires the vehicle to come to a stop immediately. The vehicle should enter graceful power-off (GPO) to exit drive, and a separate alert should indicate that condition.

Lead acid: Low voltage (LV) battery voltage below threshold for 3 seconds (3s); transistor gating LV battery connection is open (no current flow); vehicle load shedding is active; or reverse battery transistor issue detected.

The vehicle will not enter drive. If the vehicle is driving, it will exit drive through graceful power-off (GPO) to come to a stop immediately. A separate alert should be present to indicate the GPO

VCFRONT_a192_vehicleLoadShed

The low voltage (LV) battery is no longer supported by the power conversion system (PCS). The vehicle low voltage electrical system needs to shed electrical loads by cutting power to some systems / electronic control units (ECUs).

Lead acid: low voltage (LV) battery voltage below 12.2V while high voltage (HV) support from the power conversion system (PCS) is requested; Li-ion: low voltage (LV) battery is not supported by the power conversion system (PCS), or the vehicle has experienced a crash event

Lead acid: Convenience features such as seat heaters, auxiliary ports, and HVAC will no longer be available. Li-ion: All nonessential features / components will no longer be available, with support reserved for critical functions like operating doors, windows, exterior lights, and front trunk (frunk).

VCFRONT_a193_mcuAudioRetry

The vehicle controller detects the Media Control Unit (MCU) audio eFuse experienced a trip due to inrush current. While the vehicle controller attempts to provide power by reseting the MCU audio eFuse, a loss of audio may occur.

The MCU eFuse experiences a false trip while the vehicle transitions into the CONDITIONING, ACCESSORY, or DRIVE vehicle power states.

The audio may be unavailable or may cut out periodically.

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_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_a194_iBoosterRetry

The electromechanical brake booster (iBooster) eFuse was retried because it tripped (circuit opened) due to inrush current when enabled by the front vehicle controller (VCFRONT).

On transition into the ACCESSORY vehicle power state, if the iBooster eFuse tripped (circuit opened) within 1 second of the enable line going high (power applied to the iBooster by the VCFRONT).

Braking functionality may be limited.

VCFRONT_a270_prechargeFailed

The Front Vehicle Controller (VCFRONT) sleep bypass did not raise the voltage to the target voltage in the expected amount of time.

The load voltage does not meet the power source voltage in the expected amount of time.

The load being precharged may not turn on. Vehicle functions relying on the load being precharged may not operate as expected.

VCFRONT_a142_exvMotorFault

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

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

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

VCFRONT_a143_pumpBatICTransFault

The vehicle controller detects the LV8907 integrated circuit on the battery pump motor issued a circuit warning, which may prevent the battery pump from running as expected.

The LV8907 integrated circuit on the on the battery pump motor issues a circuit warning that prevents the motor controller from driving the motor.

Powertrain performance may be limited.

VCFRONT_a136_refrigDischTempSns

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

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

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

VCFRONT_a137_refrigDischPresSns

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

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

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

VCFRONT_a134_fusedHighEFuseTrip

The front vehicle controller (VCFRONT) fused high current eFuse circuit is open (tripped), interrupting low voltage (LV) power feed to the coolant pumps and condenser fan. HVAC cabin cooling (air conditioning) and powertrain performance may be limited.

VCFRONT detects the fused high current eFuse circuit is open (tripped).

The coolant pumps and condenser fan will be unavailable. As a result, the power conversion system (PCS) temperature may exceed normal operational range. HVAC cabin cooling (air conditioning) and powertrain performance may be limited.

VCFRONT_a135_coolantLevelLow

The front vehicle controller (VCFRONT) detects the coolant level sensor is reporting a low coolant level or is experiencing an electrical condition (short or disconnect).

The coolant level sensor reports low coolant or is experiencing an electrical condition (short or disconnect).

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

Alerts

Alerts