IBST-A116
IBST_a116_supplyUndervoltageLvl2
Also written as IBST_A116 / IBST A116 / IBST_a116_supplyUndervoltageLvl2 / ibst_a116_supplyundervoltagelvl2
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-A116 mean?
Tesla alert code in the Integrated Brake System (IBST) module. The UBB voltage is in undervoltage level2 failure range. System shall be in 'ReducedPerformance' state. Read failed failure for parameter MasterCylinderLength The measured average coil resistivity is below the min threshold. UB6 to UBB plausi voltage divider drift failure (large deviation in the UB6 to UBB ratio) Version of RPS calibration data in NvM inconsistent with version in SW. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Phase Current 1 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. Failure word in case of actual EEPROM size detection failed or EEPROM size mismatch wrt to configured size and actual size mounted on layout. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. There is a permanent deviation between the target speed and the actual motor speed EPBR_systemStatus message not received or corrupt
Original Description
The UBB voltage is in undervoltage level2 failure range. System shall be in 'ReducedPerformance' state. Read failed failure for parameter MasterCylinderLength The measured average coil resistivity is below the min threshold. UB6 to UBB plausi voltage divider drift failure (large deviation in the UB6 to UBB ratio) Version of RPS calibration data in NvM inconsistent with version in SW. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. Phase Current 1 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. Failure word in case of actual EEPROM size detection failed or EEPROM size mismatch wrt to configured size and actual size mounted on layout. ECU internal fault, check wiring to the unit and/or re-flash. If problem continures after several power cycles, reolace unit. There is a permanent deviation between the target speed and the actual motor speed EPBR_systemStatus message not received or corrupt
Affected Tesla Models
What You May Notice
- Integrated Brake System alert: The UBB voltage is in undervoltage level2 failure range. System shall be in 'ReducedPerformance' state. Read failed fail
- 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-A116 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.