BMS-A086
BMS_a086_SW_FC_Contactor_Mismatch
Also written as BMS_A086 / BMS A086 / BMS_a086_SW_FC_Contactor_Mismatch / bms_a086_sw_fc_contactor_mismatch
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-A086 mean?
Tesla alert code in the Battery Management System (BMS) module. BMS detects a mismatch between actual and commanded FC contactor set state HVP comms are ok AND fast charge contactors were closed AND fast charge contactors are now open/opening AND BMS_fcContactorRequest has remained closed
Original Description
BMS detects a mismatch between actual and commanded FC contactor set state HVP comms are ok AND fast charge contactors were closed AND fast charge contactors are now open/opening AND BMS_fcContactorRequest has remained closed
Affected Tesla Models
What You May Notice
- BMS-A086 may appear with another Tesla alert in the Battery Management System (BMS) system.
- The vehicle may limit charging, driving, comfort, or safety features depending on the active alerts.
- The alert may clear after sleep, but recurring alerts should be treated as service-relevant.
How to Diagnose and Resolve
- 1 Reboot the vehicle (hold both scroll wheels for 10 seconds)
- 2 Check the Tesla app for any pending software updates
- 3 Monitor the alert over 1–2 charge cycles; schedule service if it recurs
Severity Notes
BMS-A086 is an Alert in the Battery Management System system. Confirm the vehicle screen and Tesla app show no driving or charging restrictions, and schedule service if the alert returns.