Service procedures
12V Reset
Power cycles all of the eFuses on the Vehicle Front Controller (VCFRONT) and shuts off Sleep Bypass.
PROC_VCFRONT_X_12V-RESET
Model 3 / Y
Service procedures
2026 firmware
Ensure Power Off - Open HV Contactors
Gen3/tasks/PROC_VCFRONT_X_POWER-CONTACTORS_OPEN
What this task does
The procedure opens both positive and negative high voltage contactors and disables low voltage (LV) support, so that the vehicle becomes completely powered off if the LV battery is also disconnected.
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, Pre-2024 Model 3
- Supported connection
- Local connection
- Vehicle state
- Stationary · Parked
- Gateway diagnostic level
- No specific level listed
Procedure notes
High voltage contactors and LV support will reconnect automatically after a short period of time, if LV battery is still connected.
Task inputs (1)
timeout
timeout · Int
Timeout value in seconds. The system will ensure the power state for this timeout amount.
Firmware default: 60
Model 3 / Y Intel · Firmware 2026.32.7
- Vehicle coverage
- Model Y, Pre-2024 Model 3
- Supported connection
- Local connection
- Vehicle state
- Stationary · Parked
- Gateway diagnostic level
- No specific level listed
Procedure notes
High voltage contactors and LV support will reconnect automatically after a short period of time, if LV battery is still connected.
Task inputs (1)
timeout
timeout · Int
Timeout value in seconds. The system will ensure the power state for this timeout amount.
Firmware default: 60
Model S / X (2021+) AMD · Firmware 2026.20.6.1
- Vehicle coverage
- 2021+ Model S, 2021+ Model X
- Supported connection
- Local connection
- Vehicle state
- Stationary · Parked
- Gateway diagnostic level
- No specific level listed
Procedure notes
High voltage contactors and LV support will reconnect automatically after a short period of time, if LV battery is still connected.
Task inputs (1)
timeout
timeout · Int
Timeout value in seconds. The system will ensure the power state for this timeout amount.
Firmware default: 60
Related service tasks
Browse all tasks →
Self-tests
Active Louver Self Test
Performs louver connection check. Will only move the louver through partial range of motion.
TEST-SELF_VCFRONT_X_ACTIVE-LOUVER
Model 3 / Y
Service procedures
Allow High Beam Enablement in Factory Mode
Allows high beams to be enabled in Factory Mode until the Front Vehicle Controller (VCFRONT) ECU is power cycled.
PROC_VCFRONT_X_ALLOW-HIGH-BEAMS-FACTORY
Model S / X (2021+)
Self-tests
Ambient Sensor Test
Tests for power, connection, and communication of the ambient sensor controlled by the Front Vehicle Controller (VCFRONT).
TEST-SELF_VCFRONT_X_AMBIENT-TEMP
Model 3 / Y
Model S / X (2021+)