MyTeslaMate App

Signal Name	Description	Condition	Impact
VCFRONT_a485_steeringFeedbackVoltageMismatch	The vehicle controller detects there is voltage mismatch greater than 0.5V between the input power to the front vehicle controller (VCFRONT) and steering feedback circuit.	The voltage mismatch is greater than 0.5V between the VCFRONT printed circuit board assembly (PCBA) input voltage and the eFuse output voltage.	Steering wheel feedback functionality may be limited or unavailable.
VCFRONT_a486_mcuGraphicsEFuseFault	The front vehicle controller (VCFRONT) detects an eFuse overcurrent event (or a trip) on the media control unit (MCU) discrete graphics processing unit (dGPU) high side driver.	The VCFRONT detects an eFuse overcurrent event on the MCU dGPU high side driver.	The graphics on the center display may be unavailable or may not function as expected.
VCFRONT_a488_difVoltageMismatch	The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and front drive inverter (DIF) 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 speed and power may be limited.
VCFRONT_a484_steeringFeedbackEFuseTrip	The front vehicle controller has opened the voltage supply circuit to the Steering Feedback.	A fault is reported by the Steering Feedback eFuse circuitry.	Functions on the Steering Feedback will no longer work.
VCFRONT_a477_difEFuseFault	The front vehicle controller (VCFRONT) detects the front drive inverter (DIF) eFuse has tripped (circuit opened), interrupting electrical power supply to the DIF. Powertrain performance may be limited.	The VCFRONT detects the eFuse circuit gating low voltage (LV) power to the DIF as open (tripped).	Powertrain performance may be limited.
VCFRONT_a482_lvBridgeEFuseTrip	The front vehicle controller (VCFRONT) has opened the voltage supply circuit to the LV Bridge, making the low voltage (LV) battery no longer supported by the power conversion system (PCS). If the PCS is no longer providing support to VCFRONT, functions on the right side of the vehicle will be unavailable.	A condition causing the voltage supply to the LV Bridge to be interrupted is reported by the LV Bridge EFuse circuitry.	The low voltage (LV) battery is no longer supported by the power conversion system (PCS). If the PCS is no longer providing support to the front vehicle controller (VCFRONT), functions on the right side of the vehicle will be inoperable / unavailable because the right vehicle controller (VCRIGHT) will no longer be powered by VCFRONT.
VCFRONT_a490_coolantPumpsNotIdentified	The front vehicle controller (VCFRONT) detects at least one coolant pump has not been identified and configured.	The coolant fluid fill / drain routine is run.	Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited. Noise, vibration, and/or harshness (NVH) conditions may also be present.
VCFRONT_a483_lvBridgeVoltageMismatch	The vehicle controller detects there is voltage mismatch greater than 0.5V between the input power to the front vehicle controller (VCFRONT) and low voltage (LV) bridge 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 depend on the LV bridge may be unavailable, or their performance may be affected.
VCFRONT_a476_LVBMSMIA	One or more of the messages the vehicle controller receives periodically from the Low Voltage Battery Management System (LVBMS) is not received, indicating the LVBMS may be unavailable (MIA).	The vehicle controller does not receive one or more of the expected messages from LVBMS within the expected time frame over the local interconnect network (LIN).	Vehicle functions that depend on the low voltage battery controllers may be unavailable or may not function as expected.
VCFRONT_a477_LVBatteryUnrecoverableByVehicle	The low voltage battery management system (LVBMS) reports the low voltage (LV) battery's internal protection transistor (MOSFET) has opened and it is not recoverable by the vehicle. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool. A separate alert will indicate whether the battery requires replacement.	The LVBMS reports to the vehicle controller that the LV battery is not recoverable due to any of the following conditions: depleted LV battery state of charge (SoC) due to deep discharge; one or more cell voltage(s) at less than its threshold; the sum of all cell voltages is less than its threshold.	The LV battery is not recoverable by the vehicle. If recovery via an external charger tool is unsuccessful, replacement will be necessary.
VCFRONT_a503_TLVBMS_BrickExtendedOvFault	A Low Voltage (LV) battery pack brick voltage is above the over voltage limit for an extended time period.	A battery pack brick voltage is greater than the over voltage limit for an extended time period.	Vehicle may be unable to drive.
VCFRONT_a478_LVBMS_MOSFET_Open	The low voltage battery management system (LVBMS) has opened the low voltage (LV) battery's internal protection transistor (MOSFET), disconnecting the LV battery from the rest of the vehicle electrical systems.	The LVBMS reports the LV battery's internal protection transistor (MOSFET) is open.	The LV battery is unable to support vehicle electrical systems or to recharge via the power conversion system (PCS). The high voltage (HV) system will remain energized to continue supplying electrical power to the vehicle while the LV battery is unavailable. This may result in greater range loss than expected, increased HV system energy consumption when the vehicle is idle, and prevent the vehicle from sleeping.
VCFRONT_a487_frontOPCEFuseFault	The front vehicle controller (VCFRONT) detects the front Oil Pump Controller (OPC) eFuse circuit has tripped (circuit opened), interrupting power supply to the front OPC. Powertrain performance may be limited.	The VCFRONT detects the eFuse circuit gating low voltage (LV) power feed to the front OPC as open (tripped).	Powertrain performance may be limited.
VCFRONT_a473_threeWayValveFault	The front vehicle controller (VCFRONT) detects the three-way valve has encountered a condition preventing it from performing as designed.	The three-way valve encounters a condition preventing it from performing as designed. Alert log signal data should provide more information on the specific condition(s) detected.	Vehicle functions that rely on the three-way valve may be limited or unavailable.
VCFRONT_a498_PCSEFuseOVTLoadShed	The front vehicle controller (VCFRONT) detects the power conversion system (PCS) eFuse has exceeded 133 degrees C. The PCS eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced to 175A or less. VCFRONT is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).	The PCS eFuse temperature is detected as greater than 133 degrees C for 500 milliseconds.	Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).
VCFRONT_a479_LVBMS_ECPA_NotClosed	The low voltage battery management system (LVBMS) is reporting the low voltage (LV) battery's electronic connector position assurance (E-CPA) is not secure, which could result in the LV battery becoming disconnected from the rest of the vehicle electrical systems. This could occur due to the E-CPA locking tab not being fully pushed down, or communication issues between the LVBMS and vehicle controller.	The LVBMS is not communicating as expected with the vehicle controller (MIA) or reports the LV battery's E-CPA is not closed.	The LV battery may become (or may already be) disconnected from the rest of the vehicle electrical systems, which would make the LV battery unable to support vehicle electrical systems or to recharge via the power conversion system (PCS).
VCFRONT_a465_lowFlowIndexHighSubcoolFlagged	The flow index value is low at high subcool. The refrigerant flow rate through the electronic expansion valves (EXV) is not meeting the expected value when compared to the compressor refrigerant flow rate.	The vehicle detects that refrigerant flow index is below expected levels and subcool is high.	The thermal system may not perform as expected.
VCFRONT_a464_highFlowIndexHighSubcoolFlagged	The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is high.	The estimated refrigerant flow index is above the expected level, and the subcool is high.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a466_highFlowIndexLowSubcoolFlagged	The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is low.	The estimated refrigerant flow index is above the expected level, and the subcool is low.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.
VCFRONT_a467_lowPowerIndexFlagged	The vehicle controller detects the actual A/C compressor power is lower than expected.	The A/C compressor power index is lower than expected.	Cabin climate control system air conditioning and heating may be limited or unavailable. Battery heating and cooling performance may be limited.

VCFRONT_a485_steeringFeedbackVoltageMismatch

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

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

Steering wheel feedback functionality may be limited or unavailable.

VCFRONT_a486_mcuGraphicsEFuseFault

The front vehicle controller (VCFRONT) detects an eFuse overcurrent event (or a trip) on the media control unit (MCU) discrete graphics processing unit (dGPU) high side driver.

The VCFRONT detects an eFuse overcurrent event on the MCU dGPU high side driver.

The graphics on the center display may be unavailable or may not function as expected.

VCFRONT_a488_difVoltageMismatch

The front vehicle controller (VCFRONT) detects there is voltage mismatch greater than 0.5V between the input power to the VCFRONT and front drive inverter (DIF) 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 speed and power may be limited.

VCFRONT_a484_steeringFeedbackEFuseTrip

The front vehicle controller has opened the voltage supply circuit to the Steering Feedback.

A fault is reported by the Steering Feedback eFuse circuitry.

Functions on the Steering Feedback will no longer work.

VCFRONT_a477_difEFuseFault

The front vehicle controller (VCFRONT) detects the front drive inverter (DIF) eFuse has tripped (circuit opened), interrupting electrical power supply to the DIF. Powertrain performance may be limited.

The VCFRONT detects the eFuse circuit gating low voltage (LV) power to the DIF as open (tripped).

Powertrain performance may be limited.

VCFRONT_a482_lvBridgeEFuseTrip

The front vehicle controller (VCFRONT) has opened the voltage supply circuit to the LV Bridge, making the low voltage (LV) battery no longer supported by the power conversion system (PCS). If the PCS is no longer providing support to VCFRONT, functions on the right side of the vehicle will be unavailable.

A condition causing the voltage supply to the LV Bridge to be interrupted is reported by the LV Bridge EFuse circuitry.

The low voltage (LV) battery is no longer supported by the power conversion system (PCS). If the PCS is no longer providing support to the front vehicle controller (VCFRONT), functions on the right side of the vehicle will be inoperable / unavailable because the right vehicle controller (VCRIGHT) will no longer be powered by VCFRONT.

VCFRONT_a490_coolantPumpsNotIdentified

The front vehicle controller (VCFRONT) detects at least one coolant pump has not been identified and configured.

The coolant fluid fill / drain routine is run.

Cabin climate control system air conditioning and heating may be limited or unavailable. Powertrain performance may be limited. Noise, vibration, and/or harshness (NVH) conditions may also be present.

VCFRONT_a483_lvBridgeVoltageMismatch

The vehicle controller detects there is voltage mismatch greater than 0.5V between the input power to the front vehicle controller (VCFRONT) and low voltage (LV) bridge 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 depend on the LV bridge may be unavailable, or their performance may be affected.

VCFRONT_a476_LVBMSMIA

One or more of the messages the vehicle controller receives periodically from the Low Voltage Battery Management System (LVBMS) is not received, indicating the LVBMS may be unavailable (MIA).

The vehicle controller does not receive one or more of the expected messages from LVBMS within the expected time frame over the local interconnect network (LIN).

Vehicle functions that depend on the low voltage battery controllers may be unavailable or may not function as expected.

VCFRONT_a477_LVBatteryUnrecoverableByVehicle

The low voltage battery management system (LVBMS) reports the low voltage (LV) battery's internal protection transistor (MOSFET) has opened and it is not recoverable by the vehicle. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool. A separate alert will indicate whether the battery requires replacement.

The LVBMS reports to the vehicle controller that the LV battery is not recoverable due to any of the following conditions: depleted LV battery state of charge (SoC) due to deep discharge; one or more cell voltage(s) at less than its threshold; the sum of all cell voltages is less than its threshold.

The LV battery is not recoverable by the vehicle. If recovery via an external charger tool is unsuccessful, replacement will be necessary.

VCFRONT_a503_TLVBMS_BrickExtendedOvFault

A Low Voltage (LV) battery pack brick voltage is above the over voltage limit for an extended time period.

A battery pack brick voltage is greater than the over voltage limit for an extended time period.

Vehicle may be unable to drive.

VCFRONT_a478_LVBMS_MOSFET_Open

The low voltage battery management system (LVBMS) has opened the low voltage (LV) battery's internal protection transistor (MOSFET), disconnecting the LV battery from the rest of the vehicle electrical systems.

The LVBMS reports the LV battery's internal protection transistor (MOSFET) is open.

The LV battery is unable to support vehicle electrical systems or to recharge via the power conversion system (PCS). The high voltage (HV) system will remain energized to continue supplying electrical power to the vehicle while the LV battery is unavailable. This may result in greater range loss than expected, increased HV system energy consumption when the vehicle is idle, and prevent the vehicle from sleeping.

VCFRONT_a487_frontOPCEFuseFault

The front vehicle controller (VCFRONT) detects the front Oil Pump Controller (OPC) eFuse circuit has tripped (circuit opened), interrupting power supply to the front OPC. Powertrain performance may be limited.

The VCFRONT detects the eFuse circuit gating low voltage (LV) power feed to the front OPC as open (tripped).

Powertrain performance may be limited.

VCFRONT_a473_threeWayValveFault

The front vehicle controller (VCFRONT) detects the three-way valve has encountered a condition preventing it from performing as designed.

The three-way valve encounters a condition preventing it from performing as designed. Alert log signal data should provide more information on the specific condition(s) detected.

Vehicle functions that rely on the three-way valve may be limited or unavailable.

VCFRONT_a498_PCSEFuseOVTLoadShed

The front vehicle controller (VCFRONT) detects the power conversion system (PCS) eFuse has exceeded 133 degrees C. The PCS eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced to 175A or less. VCFRONT is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).

The PCS eFuse temperature is detected as greater than 133 degrees C for 500 milliseconds.

Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).

VCFRONT_a479_LVBMS_ECPA_NotClosed

The low voltage battery management system (LVBMS) is reporting the low voltage (LV) battery's electronic connector position assurance (E-CPA) is not secure, which could result in the LV battery becoming disconnected from the rest of the vehicle electrical systems. This could occur due to the E-CPA locking tab not being fully pushed down, or communication issues between the LVBMS and vehicle controller.

The LVBMS is not communicating as expected with the vehicle controller (MIA) or reports the LV battery's E-CPA is not closed.

The LV battery may become (or may already be) disconnected from the rest of the vehicle electrical systems, which would make the LV battery unable to support vehicle electrical systems or to recharge via the power conversion system (PCS).

VCFRONT_a465_lowFlowIndexHighSubcoolFlagged

The flow index value is low at high subcool. The refrigerant flow rate through the electronic expansion valves (EXV) is not meeting the expected value when compared to the compressor refrigerant flow rate.

The vehicle detects that refrigerant flow index is below expected levels and subcool is high.

The thermal system may not perform as expected.

VCFRONT_a464_highFlowIndexHighSubcoolFlagged

The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is high.

The estimated refrigerant flow index is above the expected level, and the subcool is high.

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

VCFRONT_a466_highFlowIndexLowSubcoolFlagged

The vehicle controller detects a discrepancy in the estimated refrigerant flow rates between the A/C compressor and recirculation electronic expansion valve (EXV) as the estimated refrigerant flow index is higher than expected while the subcool is low.

The estimated refrigerant flow index is above the expected level, and the subcool is low.

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

VCFRONT_a467_lowPowerIndexFlagged

The vehicle controller detects the actual A/C compressor power is lower than expected.

The A/C compressor power index is lower than expected.

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

Alerts

Alerts