Den Code BMS_a122 hat im Fahrzeug das Steuergerät „Batteriemanagement (BMS)“ gemeldet. Der Buchstabe „a“ in der Mitte ordnet ihn den Einträgen vom Typ alert zu.
Battery Management System — das Gehirn der Hochvoltbatterie. Es überwacht Zellspannungen, Temperatur, Isolationswiderstand und die zulässige Leistung. Bei Gebrauchtwagen ist das die meistbeachtete Codegruppe, denn hier zeigt sich der Zustand der Batterie. Codes zu Isolation oder Zellinstabilität gehören zu denen, die man zeitnah prüfen lassen sollte.
Der häufigste Typ. Das Fahrzeug hat das Ereignis protokolliert und möglicherweise im Display angezeigt. Die Bandbreite ist groß — von einer Kleinigkeit, die von selbst verschwindet, bis zu etwas, das behoben werden muss.
So heißt der Fehler direkt in der Fahrzeug-Firmware. Bei Codes ohne Beschreibung ist das der genaueste vorhandene Anhaltspunkt — der Name selbst sagt, worum es geht.
Der folgende Text stammt aus der technischen Dokumentation von Tesla. Wir belassen ihn im englischen Original, damit sich die Bedeutung durch die Übersetzung nicht verschiebt.
Indicate that a thermistor reading is irrational
BMS cannot measure the temperature on any modules
BMS has faulted while charging or attempting to charge due to a fault
BMS does not receive the UI charge request message
BMS receives the UI charge request message
BMS does not receive charging-related requests from the UI
Indicates a BMB reference voltage was out of bounds
BMS has detected that one or more bricks' voltage is above the warning threshold
Wall connector contactor output shows no voltage when expected to be closed on one or more phases
No voltage is seen on Wall Connector output when contactors are expected to be closed
Voltage is seen at the wall connector output or contactors switch to open state
Wall connector will not operate
Wall connector charge handle temperature too high
info from manualCC_A013
Wall connector charge handle temperature exceeds 78 C
Wall connector charge handle temperature falls below 58 C or user interaction if charging was stopped
Wall connector will reduce reported current capability in 25 percent increments until condition clears or current reaches zero and charging is stopped
Master unit current limit set too low
info from manualCC_A024
Master unit current limit divided by number of units in the sharing network is less than 6 A
Master unit current limit set high enough to allow 6 A or greater per unit in the network
Input wiring terminals are too hot as detected by non-contact IR sensor
info from manualCC_A041
Input wiring terminal IR emission exceeds threshold
Input wiring terminal IR emission falls below threshold
Charging rate will be reduced by 50% and one red blink on LEDs
Wall connector PCBA temperature too high
info from manualCC_A011
Wall connector PCBA temperature exceeds 100 C
Wall connector PCBA temperature falls below 80 C or user interaction if charging was stopped
Wall connector input wiring connections are incorrect
info from manualCC_A009
Wall connector line and neutral conductors are swapped
Wall connector input wiring is corrected
Wall connector will not operate while input wiring is swapped
Wall connector microcontroller internal self test fault
info from manualCC_A014
Wall connector microcontroller failed internal self test
Wall connector microcontroller passes internal self test
Wall connector will not operate until self test passes
AC line PLL failed to lock. Check grid frequency and quality.
PLL was unable to identify valid grid frequency and phase
AC line PLL successfully locks
GFCI cannot function without locked PLL, Wall Connector will not operate
Wall connector input terminal temperature sensor shorted, open, or too cold
info from manualCC_A026
Input terminal temperature sensor measured as open or short circuit
Wall connector input terminal temperature reading passes rationality check
Vehicle side protective earth is disconnected from wall connector
info from manualCC_A002
Vehicle side protective earth is disconnected or high impedance
Vehicle side protective earth is connected
Wall connector will not allow charging until vehicle side protective earth is connected
More than three units configured as slaves were detected on the sharing network
info from manualCC_A023
More than three units are configured as slaves in the sharing network
Three or fewer slave units are detected on the sharing network
info from manualCC_A028
Wall connector current limit selection dial is set to an invalid position
Rotary dial changed to valid setting and unit is power cycled
Microcontroller supply rail is incorrect
info from manualCC_A020
Microcontroller supply voltage is outside of valid range
Microcontroller supply voltage enters valid range
Wall Connector WiFi module hasn't checked in with the real-time processor
WiFi module has failed to check in due to a long running process, update, or software bug
WiFi module checks in with the real-time processor
Charging will continue normally, but connectivity and billing may be delayed or unavailable
Wall connector charge handle temperature sensor shorted, open, or too cold
info from manualCC_A027
Charge handle temperature sensor measured as open or short circuit
Wall connector charge handle temperature reading passes rationality check
AC RMS input voltage is too low
info from manualCC_A008
AC RMS input voltage fell below 160 V RMS for more than 2 seconds
AC RMS input voltage rises above 170 V RMS for more than 2 seconds
Wall connector will not allow charging while the input voltage is too low
Ground fault detection circuit self test failed
info from manualCC_A004
Ground fault detection circuit self test passed after being re-run. Test re-runs after 15 minutes (non-EU), cable cycle, or reset button.
Wall connector will not allow charging until the ground fault circuit self test passes
info from manualCC_A029
Pilot level transitions to invalid voltage level
Wall connector will not operate while pilot level is invalid
Wall connector PCBA temperature sensor shorted, open, or too cold
info from manualCC_A025
PCBA temperature sensor measured as open or short circuit
Wall connector PCBA temperature reading passes rationality check
info from manualCC_A015
Neutral conductor is grounded on vehicle side
info from manualCC_A005
Neutral conductor conductor impedance to ground on vehicle side is less than 2 Ohms with contactors open
Neutral conductor impedance to ground on vehicle is greater than 2 Ohms with contactors open
Wall connector will not allow charging if there is a short between neutral and protective earth when a vehicle is connected before closing contactors
Wall connector proximity line disconnected or vehicle is not providing proximity voltage
info from manualCC_A019
Proximity line in charge cable has no voltage present but a vehicle is connected
Proximity line in charge cable rises to a valid voltage level
Wall connector will not allow charging while the proximity line is broken because it cannot determine if the cable is latched
Wall connector charge handle is too hot
Wall Connector handle temperature exceeds 65C
Wall connector handle temperature falls below 60C
Ground fault current exceeded threshold
info from manualCC_A003
Ground fault current has been corrected and the test re-run. Test re-runs after 15 minutes (non-EU), cable cycle, or reset button.
Wall connector will not allow charging until ground fault current path is corrected and the test re-run.
info from manualCC_A018
Master and slave units in sharing network have different nameplate current ratings
info from manualCC_A030
Wall connector nameplate current rating differs from other wall connector in sharing network
Wall connector no longer detects units with different nameplate current rating in the sharing network and the unit is power cycled
Wall connector protective earth is disconnected or grounding scheme DIP switch set incorrectly
info from manualCC_A001
Wall connector AC input side ground impedance is above threshold
Wall connector AC input side ground impedance has fallen below threshold for adequate time
Wall connector will not allow charging until the protective earth connection is corrected
Output voltage, current, and energy monitoring failure
Metering hardware fails to initialize
Metering hardware initializes successfully
Wall Connector cannot detect welds, over-current, or meter energy. Wall Connector will not operate.
Schreiben Sie ihn exakt ab, samt Buchstabe und Nummer. Ein Foto vom Display ist am sichersten — Codes unterscheiden sich oft nur in einer Ziffer, und eine Verwechslung führt in die Irre.
Ein Teil der Codes verschwindet nach einem Neustart des Displays oder wenn das Fahrzeug einige Stunden verschlossen steht. Kehrt der Code nicht zurück, war es meist ein einmaliger Aussetzer.
Ein einmaliger Eintrag und ein Code, der nach jeder Fahrt erscheint, sind zwei verschiedene Dinge. Der Werkstatt hilft es sehr, wenn Sie wissen, wann genau er auftritt.
Bei Airbags, Bremsen, Lenkung und Hochvolt lohnt sich kein Abwarten. Bei den übrigen Gruppen kann man beobachten, ob der Code überhaupt wiederkommt.
Fehlercodes sind nur ein Teil des Bildes. Bei Fahrzeugen auf TesList sehen Sie zusätzlich den direkt aus dem Auto ausgelesenen Batteriezustand und einen Preisrechner, der aus dem aktuellen Angebot ermittelt, was ein Fahrzeug heute wirklich wert ist.