TESLA Network

Tesla SCM Alert Codes

SCM reference page with 8 Tesla alert codes, 1 detailed descriptions, severity counts, and diagnostic context.

Critical

Warning

Caution

Info

What the SCM system covers

SCM alerts belong to Tesla's proprietary diagnostic alert system and are grouped under the network category.

Read all active alerts together instead of diagnosing a single code in isolation.

Check recent service, firmware updates, and low-voltage battery condition.

Use Tesla Service or a qualified EV technician for safety-critical systems.

Alert type breakdown

Alert 6 Fault 2

Tesla SCM code list

Rows with a linked code have a dedicated detail page.

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Code	Severity	Type	Description
SCM_a027 SCM_a027_externalIsolationLow	Caution	Alert	SCM_a027 - external Isolation Low Tesla alert code in the SCM (SCM) module related to external isolation low.
SCM_a044 SCM_a044_proximityRationality	Caution	Alert	SCM_a044 - proximity Rationality Tesla alert code in the SCM (SCM) module related to proximity rationality.
SCM_a074 SCM_a074_isoVDiffHi	Caution	Alert	SCM_a074 - iso V Diff Hi Tesla alert code in the SCM (SCM) module related to iso v diff hi.
SCM_a076 SCM_a076_bmsMIA	Caution	Alert	SCM_a076 - BMS MIA Tesla alert code in the SCM (SCM) module related to bms mia.
SCM_a078 SCM_a078_voltageMatchTimeout	Caution	Alert	SCM_a078 - voltage Match Timeout Tesla alert code in the SCM (SCM) module related to voltage match timeout.
SCM_a091 SCM_a091_voltageRiseDetection	Caution	Alert	SCM_a091 - voltage Rise Detection Tesla alert code in the SCM (SCM) module related to voltage rise detection.
SCM_f027 SCM_f027_externalIsolationLow	Critical	Fault	SCM_f027 - external Isolation Low Tesla fault code in the SCM (SCM) module. Alert may be shown on the supercharger while a car is charging. This alert may indicate an insulation breakdown or other loss of isolation resistance in one of the following:The DC cabling between the supercharger and the car.The DC cabling between the charge port and high voltage junction box (HVJB), If while charging, anywhere inside the vehicle's high voltage DC system.
SCM_f091 SCM_f091_voltageRiseDetection	Critical	Fault	SCM_f091 - voltage Rise Detection Tesla fault code in the SCM (SCM) module related to voltage rise detection.