IBST-D021
IBST_d021_ubbSupplyLine
Also written as IBST_D021 / IBST D021 / IBST_d021_ubbSupplyLine / ibst_d021_ubbsupplyline
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-D021 mean?
Tesla diagnostic code in the Integrated Brake System (IBST) module. The alert sets against the 12V supply, and there is a UBB supply line interruption, which could be caused by a damaged / missing fuse, broken vehicle wire harness, wiring issue, or a deep under-voltage condition.
Original Description
The alert sets against the 12V supply, and there is a UBB supply line interruption, which could be caused by a damaged / missing fuse, broken vehicle wire harness, wiring issue, or a deep under-voltage condition.
Affected Tesla Models
What You May Notice
- Integrated Brake System alert: The alert sets against the 12V supply, and there is a UBB supply line interruption, which could be caused by a damaged /
- 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-D021 is a diagnostic or informational code in the Integrated Brake System system. Typically no immediate action is required.