IBST-A156
IBST_a156_supplyOvervoltageLvl1
Also written as IBST_A156 / IBST A156 / IBST_a156_supplyOvervoltageLvl1 / ibst_a156_supplyovervoltagelvl1
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-A156 mean?
Tesla alert code in the Integrated Brake System (IBST) module. The UBB voltage is in overvoltage level1 failure range. System shall be in 'ReducedPerformance' state. CPU exception occurrd. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Offset Current 2 out of range high. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. ECU Bandgap Failure. 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 in overvoltage level1 failure range. System shall be in 'ReducedPerformance' state. CPU exception occurrd. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Offset Current 2 out of range high. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. ECU Bandgap Failure. 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 in overvoltage level1 failure range. System shall be in 'ReducedPerformance' state. CPU exception occ
- 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-A156 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.