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Service procedures 2026 firmware

Write or Read HVC BMB ASIC Type

Gen3/tasks/PROC_HVC_X_BMB-ASIC-TYPE

What this task does

This routine allows one to write or read the BMB ASIC type to the HVBMS and HVP ECUs. See Toolbox Article 7761700 for more details regarding how to determine the correct BMB ASIC type to write, if needed.

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 · Neutral; Stationary · Parked
Gateway diagnostic level
Factory, DiagLinkActive, Service

Procedure notes

Pack contactors may open and then close shortly afterwards. Failure to write the correct BMB ASIC type may lead to the inability to close pack contactors.

Task inputs (2)

Write or Read BMB ASIC Type

READ_OR_WRITE · String

Firmware default: READ

Options: READ, WRITE

BMB ASIC Type

BMB_ASIC_TYPE · String

If WRITE selected, choose the specific BMB ASIC type to write according to Toolbox Article 7761700.

Firmware default: LTC831

Options: LTC831, ADBMS6830, BQ796xx

Model 3 / Y Intel · Firmware 2026.32.7
Vehicle coverage
Model Y, Pre-2024 Model 3
Supported connection
Local connection
Vehicle state
Stationary · Neutral; Stationary · Parked
Gateway diagnostic level
Factory, DiagLinkActive, Service

Procedure notes

Pack contactors may open and then close shortly afterwards. Failure to write the correct BMB ASIC type may lead to the inability to close pack contactors.

Task inputs (2)

Write or Read BMB ASIC Type

READ_OR_WRITE · String

Firmware default: READ

Options: READ, WRITE

BMB ASIC Type

BMB_ASIC_TYPE · String

If WRITE selected, choose the specific BMB ASIC type to write according to Toolbox Article 7761700.

Firmware default: LTC831

Options: LTC831, ADBMS6830, BQ796xx

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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+)