IBST-A155
IBST_a155_supplyUndervoltageLvl1
Also written as IBST_A155 / IBST A155 / IBST_a155_supplyUndervoltageLvl1 / ibst_a155_supplyundervoltagelvl1
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-A155 mean?
Tesla alert code in the Integrated Brake System (IBST) module. The UBB voltage is in undervoltage level1 failure range. System shall be in 'ReducedPerformance' state.
Original Description
The UBB voltage is in undervoltage level1 failure range. System shall be in 'ReducedPerformance' state.
Affected Tesla Models
What You May Notice
- Integrated Brake System alert: The UBB voltage is in undervoltage level1 failure range. System shall be in 'ReducedPerformance' state.
- 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-A155 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.