Alerts
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| Signal Name | Description | Condition | Impact |
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The vehicle controller has disabled communications over the bus that connects to the low voltage (LV) battery after detecting a condition (or conditions) that may cause the LV battery to become overdischarged. To avoid overdischarge that could make the LV battery unrecoverable, do not restore communications until the LV system is fully supported by the Power Conversion System (PCS).
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The vehicle controller detects the LV battery may become overdischarged unless it sleeps, and also determines vehicle conditions are OK to disable LV battery communications.
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The vehicle controller will have less information about the LV battery until it is serviced. Headlamps and windshield wipers may be unavailable, or may not function as expected.
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The low voltage (LV) battery type detected on startup is unknown. This usually happens the first time a controller is powered on, or after non-volatile memory (NVM) corruption, which will be indicated by another alert.
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The LV battery type detected on startup is unknown.
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LV battery performance may be limited. LV battery support for vehicle electrical systems may be limited or unavailable.
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An electrical error has been detected with the right fog light guide (white light pipe in front fascia that turns on along with fog light).
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The high side driver (HSD) for the right fog light guide reports that an undercurrent or short circuit condition is present.
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The right fog light guide may not be working.
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The low voltage battery management system (LVBMS) reports it has detected the charge current is above the maximum limit for the low voltage (LV) battery cells in their present condition.
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The LVBMS detects the charge current is above the maximum limit for the LV battery cells in their present condition for 1 second.
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Exceeding charge current limits may shorten the life of LV battery cells, leading to accelerated degradation and replacement.
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The Low Voltage (LV) battery internal protection transistor (MOSFET) temperature is greater than the temperature limit.
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The MOSFET temperature is greater than the expected set temperature limit for longer than expected.
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There may be a loss of LV battery pack power. This alert may indicate a high impedance or other conditions affecting the expected operation of the LV battery MOSFET.
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The vehicle controller detected that the compressor delivered much less refrigerant flow than nominal and discharge temperature was abnormally high.
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The vehicle detects at least two of the following: refrigerant flow delivered by compressor is abnoramlly low by referring to EXV opening or cabin heating capacity, and discharge temperature is abnoramlly high.
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The thermal system may not perform as expected and compressor has high risk of loss of isolation due to debris.
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Left headlamp powered off due to a short circuit detected on the left headlamp power rail.
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The headlamp current is above 9A for greater than 10s
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All left headlamp lighting functions (low beam, high beam, turn signal, etc) may be degraded or unavailable
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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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The low voltage (LV) battery type detected on startup does not match the LV battery type reported by the vehicle gateway (GTW) configuration.
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The LV battery type detected on startup does not match the LV battery type reported by the GTW configuration.
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LV battery performance may be limited. LV battery support for vehicle electrical systems may be limited or unavailable.
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The low voltage battery management system (LVBMS) reports it has detected a low voltage (LV) battery cell voltage imbalance.
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The LVBMS detects that all LV battery cell voltages are not within 150mV of each other.
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The LV battery may suddenly become unavailable and unable to support vehicle electrical systems. The LV battery may require replacement, and a separate alert should be present to indicate this condition if applicable.
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The low voltage (LV) battery is not communicating as expected, indicating a potential disconnection with the vehicle controller.
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Electronic connector position assurance (ECPA) state is signal not available (SNA), or the intelligent battery sensor (IBS) is not functioning as expected and the low voltage battery management system (LVBMS) is not communicating (MIA).
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Loss of low voltage (LV) battery communication with vehicle controller, so the vehicle electrical system may only be supported via the power conversion system (PCS).
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An internal condition affecting left headlamp functionality has been detected - certain light functions or the headlamp fan may be degraded or disabled.
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The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam Flat, Ambient, DRL or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range, or the fan current or side marker current is out of range.
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Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.
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An internal condition affecting right headlamp functionality has been detected - certain light functions or the headlamp fan may be degraded or disabled.
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The pixel matrix manager detects non-functional pixels or has communication issues, or the voltage measured across the boost rail, Lowbeam Flat, Ambient, DRL or Turn LEDs is out of range, or the LED drivers in the ECU have reported status flags, or certain values programmed in the matrix manager EEPROM are out of range, or the fan current or side marker current is out of range.
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Some headlight functions may be unavailable or may not function as expected. Headlight functionality may return after vehicle sleep.
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The compressor power index is lower than expected, which typically indicates a condition affecting the compressor. This can also indicate a condition affecting the discharge or suction pressure sensors. The compressor power index measures the ratio of estimated nominal compressor power consumption against electrical power the compressor actually consumes. A low index value indicates the compressor is drawing / consuming significantly more power than a nominal compressor would be expected to consume.
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The compressor power index, which compares expected compressor power consumption against actual consumption, drops below expected levels.
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Thermal system may show reduced effectiveness. Cabin climate control performance may be limited, with cabin heating / cooling not performing at expected levels.
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The electrical current flowing through the left vehicle controller (VCLEFT) eFuse is greater or equal to 100A. The VCLEFT eFuse circuit may open (trip) if the low voltage (LV) electrical system loads are not reduced. The vehicle controller requests the VCLEFT to shed vehicle electrical loads by cutting power to the less essential loads.
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The VCLEFT eFuse current value equals or exceeds 100A for 100 milliseconds.
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Some convenience features controlled by the VCLEFT will be unavailable as the vehicle controller limits the LV electrical system current draw by cutting power to some loads.
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The eFuse application-specific integrated circuit (ASIC) on the vehicle controller has incorrect thresholds set.
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The vehicle controller detects incorrect threshold values on its eFuse ASIC for 1 second.
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The eFuse ASIC on the vehicle controller may not function as expected.
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Non user facing alert set for service set when winch mode is active.
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Enter ESM_WINCHMODE
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Electronic Parking Brake will be released
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One or more of the messages the vehicle controller receives periodically from the Gateway (GTW) is not received during a drive cycle, indicating the GTW may be unavailable (MIA).
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The vehicle controller does not receive one or more of the expected messages from the GTW within the expected time frame while the vehicle is in Drive.
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Vehicle functions that depend on the GTW may be unavailable or may not function as expected.
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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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Brake Disc Wipe algorithm is not running due to loss of input signal(s).
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One or more of the BDW algorithms input signals is unavailable.
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BDW attempted while car not in drive or input signals are being delayed
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