IBST-A086
IBST_a086_supplyOvervoltageLvl3
Also written as IBST_A086 / IBST A086 / IBST_a086_supplyOvervoltageLvl3 / ibst_a086_supplyovervoltagelvl3
Why does the exact Tesla alert ID matter?
Record the exact alert ID, including underscores, suffixes, and companion alerts. Tesla alerts that look similar can point to different modules, timestamps, and service procedures.
What does IBST-A086 mean?
Tesla alert code in the Integrated Brake System (IBST) module. The UBB voltage is above shutdown threshold(overvoltage level3). Contrary to spec BIST state machine of system IC is started by a wrong BIST command. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. ADC Pin Test detects open ADC pin. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit.
Original Description
The UBB voltage is above shutdown threshold(overvoltage level3). Contrary to spec BIST state machine of system IC is started by a wrong BIST command. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. ADC Pin Test detects open ADC pin. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit.
Affected Tesla Models
What You May Notice
- Integrated Brake System alert: The UBB voltage is above shutdown threshold(overvoltage level3). Contrary to spec BIST state machine of system IC is sta
- No noticeable change in braking performance under normal driving
How to Diagnose and Resolve
- 1 Reboot the vehicle
- 2 Monitor over the next few drives
- 3 Schedule service if the alert reappears
Severity Notes
IBST-A086 is an Alert in the Integrated Brake System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.