Skip to content
Service procedures 2026 firmware

Read or Delete HVC ECU Backup Data

Gen3/tasks/PROC_HVC_X_BACKUP-READ

Model 3 / YModel S / X (2021+)

What this task does

This routine reads the most recent High Voltage Controller (HVC) data backup from the car computer. If outdated or incorrect, this routine can also delete the saved backup file.

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 and remote access
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (1)

Operation Selection

operation · String

READ the values saved within the most recent backup file, or DELETE the file entirely.

Firmware default: READ

Options: READ, DELETE

Model 3 / Y Intel · Firmware 2026.32.7
Vehicle coverage
Model Y, Pre-2024 Model 3
Supported connection
Local connection and remote access
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (1)

Operation Selection

operation · String

READ the values saved within the most recent backup file, or DELETE the file entirely.

Firmware default: READ

Options: READ, DELETE

Model S / X (2021+) AMD · Firmware 2026.20.6.1
Vehicle coverage
2021+ Model S, 2021+ Model X
Supported connection
Local connection and remote access
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (1)

Operation Selection

operation · String

READ the values saved within the most recent backup file, or DELETE the file entirely.

Firmware default: READ

Options: READ, DELETE

Related service tasks

Browse all tasks →
Service procedures

After HV Battery Replacement

Before running this routine, a Controller Area Network (CAN) Electronic Control Unit (ECU) redeploy needs to pass. After a High Voltage (HV) Battery replacement, this routine runs all required tasks.

PROC_HVC_X_PACK-REPLACEMENT

Model 3 / Y Model S / X (2021+)
Service procedures

Clear HVC Battery Coolant Flood Alert

Clears the HVC battery coolant flood alert, BMS_a124_Battery_Coolant_Flood, if set. This routine shall only be executed after repairing the HV battery isolation issue.

PROC_HVC_X_CLEAR-BATTERY-COOLANT-FLOOD-ALERT

Model 3 / Y Model S / X (2021+)
Service procedures

Clear HVC Internal Isolation Alert

Clears the HVC internal isolation alert, BMS_a123_SW_Internal_Isolation, if set. This routine shall only be executed after repairing the HV battery isolation issue.

PROC_HVC_X_CLEAR-INTERNAL-ISOLATION-ALERT

Model 3 / Y Model S / X (2021+)
Service procedures

Clear HVC Isolation Condition

Clears the High Voltage Controller (HVC) isolation counters and alerts BMS_a027_SW_Repeated_Isolation_Failure_In_Drive, BMS_a172_SW_Isolation_Failure_In_Drive_Warning, BMS_a123_SW_Internal_Isolation, and BMS_a124_Battery_Coolant_Flood, if set. This routine shall only be executed after repairing a HV system component for loss of isolation.

PROC_HVC_X_CLEAR-ISOLATION-CONDITION

Model 3 / Y Model S / X (2021+)