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
Diagnostic tests
2026 firmware
Coolant Air Purge
Gen3/tasks/TEST_VCFRONT_X_THERMAL-COOLANT-AIR-PURGE
What this task does
Powers the accessory rail and runs HVAC pumps at maximum speed, changing valve positions. Estimated time to complete is 10 minutes. Make sure the gateway remains unlocked for at least 12 minutes (720 seconds). To exit the routine early, run this routine again with STOP as the input. The controller will continue to run coolant air purge until it is completed or is requested to stop.
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
- Service, Factory, DiagLinkActive
Task inputs (1)
Coolant Air Purge Control
mode · String
START will start the routine and poll for results, STATUS returns the current active status, STOP will stop the routine if it is running.
Firmware default: START
Options: START, STATUS, STOP
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
- Service, Factory, DiagLinkActive
Task inputs (1)
Coolant Air Purge Control
mode · String
START will start the routine and poll for results, STATUS returns the current active status, STOP will stop the routine if it is running.
Firmware default: START
Options: START, STATUS, STOP
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
- Service, Factory, DiagLinkActive
Task inputs (1)
Coolant Air Purge Control
mode · String
START will start the routine and poll for results, STATUS returns the current active status, STOP will stop the routine if it is running.
Firmware default: START
Options: START, STATUS, STOP
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+)