BMS-F045
BMS_f045_SW_Internal_CANB_error
Also written as BMS_F045 / BMS F045 / BMS_f045_SW_Internal_CANB_error / bms_f045_sw_internal_canb_error
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 BMS-F045 mean?
Tesla fault code in the Battery Management System (BMS) module. There is a poor or lack of communication with the external systems using the Controller Area Network (CAN).
Original Description
There is a poor or lack of communication with the external systems using the Controller Area Network (CAN).
Affected Tesla Models
What You May Notice
- Vehicle may show erratic battery readings or unexpected behavior
- Possible brief power interruption
- Dashboard may show multiple alerts simultaneously
How to Diagnose and Resolve
- 1 Reboot the vehicle: hold brake + scroll wheels for 10 seconds
- 2 Check for software updates in Controls > Software — install any pending updates
- 3 If the alert clears after reboot, monitor for recurrence
- 4 If alert persists or appears with other fault codes, schedule Tesla Service
- 5 Technician will inspect the CAN bus network for communication faults
Severity Notes
BMS-F045 is classified as a Fault, indicating a critical issue in the Battery Management System system. Do not continue driving and contact Tesla Service immediately.