Alerts
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| Signal Name | Description | Condition | Impact | Important |
|---|---|---|---|---|
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The front vehicle controller (VCFRONT) detects a power draw higher than expected from the right vehicle controller (VCRIGHT), causing the VCFRONT to power off the VCRIGHT.
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The observed power draw on the VCRIGHT is outside of the defined operating threshold for too long.
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Vehicle may be unable to drive and may start to power down. Vehicle functions that depend on the VCRIGHT (such as right side windows, doors, and/or seat functions) may be unavailable or their performance may be affected.
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No
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Left and right headlamps report simultaneous matrix manager, LED, High Side Driver (HSD), or Boolean status errors indicating a condition affecting functionality of both headlamps.
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For both headlamps, the SSL100 pixel matrix detects non-functional pixels or has communication issues, or the voltage measured across the Lowbeam Prefield, DRL segments, or Turn LEDs (Model S only) is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the SSL100 EEPROM are out of range, or the fan current is out of range.
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Certain light functions or the headlamp fan may be degraded or disabled for both headlamps.
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No
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Vehicle will enter deep sleep to conserve energy in 10 minutes. It is possible to wake the vehicle up within the next 10 minutes by pressing the trunk button or applying external voltage to the front trunk (frunk) access posts.
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The vehicle is in Transport Mode and the high voltage (HV) battery state of charge (SOC) is low.
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Vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.
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No
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The vehicle is attempting to recover from a deep sleep. If the vehicle does not begin charging, the vehicle will reenter deep sleep after 10 minutes.
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The vehicle is in Transport Mode, the high voltage (HV) battery state of charge (SOC) is low, and the user attempts to interact with the vehicle.
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Vehicle requires charging before it can be recovered from deep sleep. Until adequately charged, the vehicle will only wake from deep sleep via a trunk button press or when external voltage is applied to the frunk access posts.
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No
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The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a pack overvoltage condition.
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The LVBMS detects a pack overvoltage condition affecting the LV battery.
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The LV battery may be damaged and may be unable to support vehicle electrical systems.
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No
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The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a charge overcurrent condition.
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The LVBMS detects a charge overcurrent condition affecting the LV battery.
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The LV battery may be damaged and may be unable to support vehicle electrical systems.
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No
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Electrical current flowing through the power conversion system (PCS) eFuse is approaching the DCDC converter's maximum handling capacity. The front vehicle controller (VCFRONT) is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).
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The PCS eFuse current value is within 20A of the DCDC converter's maximum handling capacity for 5 seconds.
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Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).
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No
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The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a hardware overcurrent condition.
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The LVBMS detects a hardware overcurrent condition affecting the LV battery.
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The LV battery may be damaged and may be unable to support vehicle electrical systems.
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No
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The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell undervoltage condition.
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The LVBMS detects a cell undervoltage condition affecting the LV battery.
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The LV battery may be damaged and may be unable to support vehicle electrical systems.
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No
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The low voltage battery management system (LVBMS) reports it has opened the low voltage (LV) battery internal protection transistor (MOSFET) after detecting a cell overvoltage condition.
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The LVBMS detects a cell overvoltage condition affecting the LV battery.
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The LV battery may be damaged and may be unable to support vehicle electrical systems.
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No
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The low voltage (LV) battery internal protection transistor (MOSFET) is open, while the LV battery is at low state of charge and recovering the MOSFET is not being attempted. As a result, the low voltage battery management system (LVBMS) continues to draw power from the cells, which may make the LV battery unrecoverable if it is not disconnected soon.
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The LV battery state of charge (SOC) is less than 30%, the LV battery internal protection transistor (MOSFET) is open, and there are no low voltage battery management system (LVBMS) communication or firmware mismatch issues.
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The LV battery may become too deeply discharged and unrecoverable.
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No
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The low voltage (LV) battery is in a critical state and the vehicle controller is about to trigger a graceful exit from drive (also known as a graceful power-off, or GPO). At least one other alert should be present when the vehicle starts to exit drive / graceful power-off occurs.
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May set due to a condition or combination of conditions indicating the LV battery cannot support the vehicle, including: the LV battery internal protection transistor (MOSFET) is open, the reverse battery eFuse has tripped (is open), or the vehicle controller is actively shedding vehicle electrical loads to conserve energy for essential functions. Alert log signal data should provide more information.
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The vehicle will exit drive within the next few minutes, with a separate alert present to indicate that condition, and the next drive cycle will be blocked.
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No
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Low flow index has been detected at high subcool at steady state or suction superheat is found to be abnormally low, which indicates that air bubbles are circulating in the refrigerant system.
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The vehicle detects at least two of the following: low flow index at high subcool on either Chiller Only or Evap Only modes or abnormally low suction superheat.
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The thermal system may not perform as expected and the electronic expansion valves (EXV) will open wider to accommodate the air bubbles in the system.
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No
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The vehicle controller detects the low voltage (LV) battery is not within an acceptable temperature range to support vehicle electrical systems during an over-the-air (OTA) vehicle software update.
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The vehicle controller detects the LV battery temperature dropping below -20 degrees Celsius for more than 5 consecutive seconds.
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As the vehicle relies on LV battery support while installing software packages, any attempted vehicle software update will be blocked to prevent loss of electrical power during the update sequence.
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No
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The vehicle controller detects a condition affecting the right auxiliary park light (white light pipe in front fascia).
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The vehicle controller detects that the right auxiliary park light high side driver (HSD) reports one of the following: (1) a current draw below the minimum threshold (open circuit); (2) a current draw above the maximum threshold (short circuit).
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The right auxiliary park light may not produce light or may not function as expected.
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No
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The vehicle controller detects a condition (or conditions) preventing the low voltage (LV) battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. However, the LV battery may be recoverable using an external LV Lithium Ion Battery charger tool.
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A condition or combination of conditions prevents the LV battery internal protection transistor (MOSFET) from closing so the LV battery can be recovered. Alert log signal data should provide more information.
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The LV battery cannot be recovered while any condition blocking its internal protection transistor (MOSFET) from closing persists. The LV battery is unable to support vehicle electrical systems or to recharge via the power conversion system (PCS) until the internal protection MOSFET closes and recovery begins.
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No
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Electrical current flowing through the Bridge eFuse has equaled or exceeded 120A. The Bridge eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced. The front vehicle controller (VCFRONT) is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).
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The Bridge eFuse current value equals or exceeds 120A for 100 milliseconds.
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Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).
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No
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This alert is an early warning for a Low Voltage (LV) battery State of Charge (SOC) imbalance. This alert sets with a lower threshold than SocImbalance.
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The estimated imbalance between the average brick SOC and minimum brick SOC is greater than the warning set threshold.
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A brick imbalance is present. If it continues increasing, an SocImbalance alert will set.
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No
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Electrical current flowing through the right vehicle controller (VCRIGHT) eFuse has equaled or exceeded 100A. The VCRIGHT eFuse circuit may open (trip) if low voltage (LV) electrical system loads are not reduced. The front vehicle controller (VCFRONT) is shedding some vehicle electrical loads by cutting power to less essential electronic control units (ECUs).
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The VCRIGHT eFuse current value equals or exceeds 100A for 100 milliseconds.
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Some convenience features will be unavailable as VCFRONT limits LV electrical system current draw by cutting power to some electronic control units (ECUs).
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No
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A low voltage (LV) battery recovery attempt has timed out and has been aborted, and the internal protection transistor (MOSFET) has been opened. May occur because an external power supply is connected to the LV battery, or due to a high impedance connection between the power conversion system (PCS) and LV battery. The low voltage battery management system (LVBMS) reports a FAULT state.
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The LVBMS reports an LV battery recovery attempt has timed out and has been aborted because 50 seconds have passed without the LVBMS detecting adequate current flow to the LV battery across the internal protection transistor (MOSFET).
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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. The vehicle will be unable to drive while this alert persists.
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No
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