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Service procedures 2026 firmware

LVBMS Reconnect LV Battery

Gen3/tasks/PROC_VCBATT1_X_RECONNECT-LV-BATTERY

Model 3 / Y

What this task does

Reconnects the Low Voltage Battery MOSFET on Model 3 and Y platforms.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model 3 / Y AMD · Firmware 2026.32.3
Vehicle coverage
2024+ Model 3, 2025+ Model Y, Model Y
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

NOTE! Disconnect any external LV support device, then click Run when ready. Vehicle must be supporting its own LV system prior to running the reconnect routine.

Task inputs (0)

No user inputs are listed in this firmware.

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Service procedures

12V Reset

Power cycles all of the eFuses on the VCFRONT and VCBATT and shuts off Sleep Bypass.

PROC_VCBATT1_X_12V-RESET

Model 3 / Y
Communication checks

Front Vehicle Controller (VCBATT) CAN Communication

Tests communication with the front vehicle controller (VCBATT1) Electronic Control Unit (ECU). Communication is established via Unified Diagnostics Services (UDS) over the Controller Area Network (CAN).

PING-TP_VCBATT1

Model 3 / Y