IBST-A171
IBST_a171_LVPowerStateChecksum
Also written as IBST_A171 / IBST A171 / IBST_a171_LVPowerStateChecksum / ibst_a171_lvpowerstatechecksum
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-A171 mean?
Tesla alert code in the Integrated Brake System (IBST) module. Dual Core SW-Bist comparison fault. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Task Monitor reports faulty status. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit.
Original Description
Dual Core SW-Bist comparison fault. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Task Monitor reports faulty status. 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: Dual Core SW-Bist comparison fault. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures
- 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-A171 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.