MyTeslaMate App

Signal Name	Description	Condition	Impact	Important
VCFRONT_a327_vcrightSlowTripOC	The right vehicle controller eFuse current average current value over the last second was > 90A.	90A average eFuse current within last second.	The eFuse may have tripped.	No
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.	No
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.	No
VCFRONT_a260_deadLVBattery	The vehicle controller detects the the low voltage (LV) battery may be overdischarged and no longer functional. This may indicate the LV battery has been damaged due to deep discharge, or it may indicate the LV battery voltage has dropped below the minimum limit for maintaining functionality.	The vehicle controller detects LV battery voltage or LV battery Amp hour (Ah) budget are below their limits for 5 seconds.	The LV battery may be unable to hold adequate electrical charge to remain functional. Replacement may be necessary, with a separate alert present to indicate that condition if applicable.	No
VCFRONT_a261_vcleftVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the left vehicle controller (VCLEFT) circuit.	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 VCLEFT may be limited or may not function as expected.	No
VCFRONT_a257_portExpanderVOR	The front vehicle controller (VCFRONT) has detected a condition affecting a group of eFuses, making an eFuse system reset necessary.	VCFRONT detects a group of eFuses with a common power source have all tripped (circuit opened).	Vehicle may be unable to drive.	No
VCFRONT_a250_headlampsNotAimed	The vehicle controller detects that the headlights have not been aimed or require re-aiming.	A replacement front vehicle controller (VCFRONT) has been installed or the Restraints Control Module (RCM) inertial measurement unit (IMU) calibration has been completed.	The headlights may not properly illuminate the area in front of the vehicle or may dazzle oncoming drivers.	No
VCFRONT_a253_maxChrgeSssionTmeout	The low voltage (LV) battery charge cycle was stopped before it reached either its Amp hour or current targets, as the maximum time period for a charging session timeout had been reached.	The vehicle controller detects the maximum LV battery charging session timeout is reached.	Increased energy drain when the vehicle is idle, which may cause lower than expected vehicle state of charge (SOC). LV battery may have lower charge than expected.	No
VCFRONT_a262_vcrightVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the right vehicle controller (VCRIGHT) circuit.	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 VCRIGHT may be limited or may not function as expected.	No
VCFRONT_a244_sleepBypassFault	The front vehicle controller (VCFRONT) detects a condition affecting the Sleep Bypass Buck Converter circuit, preventing the vehicle from sleeping.	The output voltage measured by the VCFRONT from the Sleep Bypass Buck Converter is too low to support loads during vehicle sleep.	The vehicle is unable to sleep and will consume more energy when idle, possibly becoming unresponsive / not waking as expected.	No
VCFRONT_a243_LVOverchargeInstc	After a single discharge and recharge cycle, the low voltage (LV) battery has been overcharged by more than 5 Amp hours (Ah) compared to initial charge level. If this continues, it may indicate a condition affecting LV battery performance that makes replacement necessary. May also indicate aftermarket device(s) installed on the vehicle, whose current draw interferes with LV battery management.	Over a single charge cycle, the LV battery has recharged by more than 5Ah compared to the power initially discharged.	10 independent instances of this alert indicate a chronic overcharge condition that may require LV battery replacement to resolve, and at least one other alert should be present to indicate that condition.	No
VCFRONT_a245_pump1EFuseFault	The front vehicle controller (VCFRONT) detects the pump 1 eFuse for the powertrain (PT) pump and condenser fan is open (tripped), interrupting electrical power supply to the PT pump and condenser fan. HVAC cabin cooling (air conditioning) and powertrain performance will be limited.	A condition detected by the pump 1 eFuse has caused the powertrain pump and condenser fan eFuse circuit to open (trip).	The PT pump and condenser fan will be unavailable. HVAC cabin cooling (air conditioning) and powertrain performance will be limited.	No
VCFRONT_a242_drveBlckdVltgeTooLow	The vehicle cannot enter Drive state because the measured LV battery voltage is too low.	The measured LV battery voltage dropped below the level required for the drive state for 0.5 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.	No
VCFRONT_a227_radFanCompromised	The brushless motor has a condition affecting its functionality	The Radiator Fan motor controller detected an error	The Radiator Fan will not be able to run. The integrated circuit will clear the condition when the condition is no longer present	No
VCFRONT_a246_pump2EFuseFault	The front vehicle controller (VCFRONT) detects the pump 2 eFuse for the HV battery pump and air compressor has tripped (circuit opened), interrupting electrical power supply to the HV battery pump and air compressor. Powertrain performance may be limited.	A condition detected by the pump 2 eFuse has caused the HV battery pump and air compressor eFuse circuit to open (trip).	The HV battery pump and air compressor will be unavailable. Powertrain performance may be limited.	No
VCFRONT_a248_voltageOutOfSpec	The vehicle controller detects a difference greater than 3% between readings from the two sensors that measure the low voltage (LV) battery voltage.	The vehicle controller detects a difference greater than 3% between the values reported by the two sensors that measure the LV battery voltage.	There may be some inaccuracy in the vehicle controller's LV bus and LV battery voltage readings. This could lead to accelerated LV battery degradation or an increased likelihood of alerts related to conditions caused by the LV bus voltage being higher or lower than desired.	No
VCFRONT_a236_batTempSnsIrrational	The front vehicle controller (VCFRONT) detects the battery coolant temperature sensor is reporting an incorrect value.	There is an irrational difference between the battery coolant temperature sensor value and the battery temperature sensor value.	Powertrain performance may be limited.	No
VCFRONT_a263_pcsVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the Power Conversion System (PCS) circuit.	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 PCS may be limited or may not function as expected.	No
VCFRONT_a231_12VTempSensShort	The vehicle controller is reporting a short circuit on the low voltage (LV) battery temperature sensor, indicating damage to the sensor or wiring harness.	The LV battery temperature sensor circuit reads a power rail reference voltage, indicating a short circuit.	A default voltage setpoint is used when charging the LV battery, instead of optimizing the voltage setpoint based on the LV battery's actual temperature. The LV battery may experience accelerated degradation if this continues.	No
VCFRONT_a233_autopilot1EFuseFault	The front vehicle controller (VCFRONT) detects the Autopilot 1 eFuse has tripped (circuit opened).	The Autopilot 1 eFuse high side driver (HSD) detects electrical current flow exceeding normal (expected operating) range, causing the Autopilot 1 eFuse circuit to open (trip).	Autopilot features are unavailable.	No

VCFRONT_a327_vcrightSlowTripOC

The right vehicle controller eFuse current average current value over the last second was > 90A.

90A average eFuse current within last second.

The eFuse may have tripped.

No

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.

No

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.

No

VCFRONT_a260_deadLVBattery

The vehicle controller detects the the low voltage (LV) battery may be overdischarged and no longer functional. This may indicate the LV battery has been damaged due to deep discharge, or it may indicate the LV battery voltage has dropped below the minimum limit for maintaining functionality.

The vehicle controller detects LV battery voltage or LV battery Amp hour (Ah) budget are below their limits for 5 seconds.

The LV battery may be unable to hold adequate electrical charge to remain functional. Replacement may be necessary, with a separate alert present to indicate that condition if applicable.

No

VCFRONT_a261_vcleftVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the left vehicle controller (VCLEFT) circuit.

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 VCLEFT may be limited or may not function as expected.

No

VCFRONT_a257_portExpanderVOR

The front vehicle controller (VCFRONT) has detected a condition affecting a group of eFuses, making an eFuse system reset necessary.

VCFRONT detects a group of eFuses with a common power source have all tripped (circuit opened).

Vehicle may be unable to drive.

No

VCFRONT_a250_headlampsNotAimed

The vehicle controller detects that the headlights have not been aimed or require re-aiming.

A replacement front vehicle controller (VCFRONT) has been installed or the Restraints Control Module (RCM) inertial measurement unit (IMU) calibration has been completed.

The headlights may not properly illuminate the area in front of the vehicle or may dazzle oncoming drivers.

No

VCFRONT_a253_maxChrgeSssionTmeout

The low voltage (LV) battery charge cycle was stopped before it reached either its Amp hour or current targets, as the maximum time period for a charging session timeout had been reached.

The vehicle controller detects the maximum LV battery charging session timeout is reached.

Increased energy drain when the vehicle is idle, which may cause lower than expected vehicle state of charge (SOC). LV battery may have lower charge than expected.

No

VCFRONT_a262_vcrightVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the right vehicle controller (VCRIGHT) circuit.

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 VCRIGHT may be limited or may not function as expected.

No

VCFRONT_a244_sleepBypassFault

The front vehicle controller (VCFRONT) detects a condition affecting the Sleep Bypass Buck Converter circuit, preventing the vehicle from sleeping.

The output voltage measured by the VCFRONT from the Sleep Bypass Buck Converter is too low to support loads during vehicle sleep.

The vehicle is unable to sleep and will consume more energy when idle, possibly becoming unresponsive / not waking as expected.

No

VCFRONT_a243_LVOverchargeInstc

After a single discharge and recharge cycle, the low voltage (LV) battery has been overcharged by more than 5 Amp hours (Ah) compared to initial charge level. If this continues, it may indicate a condition affecting LV battery performance that makes replacement necessary. May also indicate aftermarket device(s) installed on the vehicle, whose current draw interferes with LV battery management.

Over a single charge cycle, the LV battery has recharged by more than 5Ah compared to the power initially discharged.

10 independent instances of this alert indicate a chronic overcharge condition that may require LV battery replacement to resolve, and at least one other alert should be present to indicate that condition.

No

VCFRONT_a245_pump1EFuseFault

The front vehicle controller (VCFRONT) detects the pump 1 eFuse for the powertrain (PT) pump and condenser fan is open (tripped), interrupting electrical power supply to the PT pump and condenser fan. HVAC cabin cooling (air conditioning) and powertrain performance will be limited.

A condition detected by the pump 1 eFuse has caused the powertrain pump and condenser fan eFuse circuit to open (trip).

The PT pump and condenser fan will be unavailable. HVAC cabin cooling (air conditioning) and powertrain performance will be limited.

No

VCFRONT_a242_drveBlckdVltgeTooLow

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

The measured LV battery voltage dropped below the level required for the drive state for 0.5 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.

No

VCFRONT_a227_radFanCompromised

The brushless motor has a condition affecting its functionality

The Radiator Fan motor controller detected an error

The Radiator Fan will not be able to run. The integrated circuit will clear the condition when the condition is no longer present

No

VCFRONT_a246_pump2EFuseFault

The front vehicle controller (VCFRONT) detects the pump 2 eFuse for the HV battery pump and air compressor has tripped (circuit opened), interrupting electrical power supply to the HV battery pump and air compressor. Powertrain performance may be limited.

A condition detected by the pump 2 eFuse has caused the HV battery pump and air compressor eFuse circuit to open (trip).

The HV battery pump and air compressor will be unavailable. Powertrain performance may be limited.

No

VCFRONT_a248_voltageOutOfSpec

The vehicle controller detects a difference greater than 3% between readings from the two sensors that measure the low voltage (LV) battery voltage.

The vehicle controller detects a difference greater than 3% between the values reported by the two sensors that measure the LV battery voltage.

There may be some inaccuracy in the vehicle controller's LV bus and LV battery voltage readings. This could lead to accelerated LV battery degradation or an increased likelihood of alerts related to conditions caused by the LV bus voltage being higher or lower than desired.

No

VCFRONT_a236_batTempSnsIrrational

The front vehicle controller (VCFRONT) detects the battery coolant temperature sensor is reporting an incorrect value.

There is an irrational difference between the battery coolant temperature sensor value and the battery temperature sensor value.

Powertrain performance may be limited.

No

VCFRONT_a263_pcsVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and the Power Conversion System (PCS) circuit.

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 PCS may be limited or may not function as expected.

No

VCFRONT_a231_12VTempSensShort

The vehicle controller is reporting a short circuit on the low voltage (LV) battery temperature sensor, indicating damage to the sensor or wiring harness.

The LV battery temperature sensor circuit reads a power rail reference voltage, indicating a short circuit.

A default voltage setpoint is used when charging the LV battery, instead of optimizing the voltage setpoint based on the LV battery's actual temperature. The LV battery may experience accelerated degradation if this continues.

No

VCFRONT_a233_autopilot1EFuseFault

The front vehicle controller (VCFRONT) detects the Autopilot 1 eFuse has tripped (circuit opened).

The Autopilot 1 eFuse high side driver (HSD) detects electrical current flow exceeding normal (expected operating) range, causing the Autopilot 1 eFuse circuit to open (trip).

Autopilot features are unavailable.

No

Alerts

Alerts